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assets/article_【2023】青训营 - 前端练习题汇总解析.md.BTN7N-YG.js → assets/article_【2023】青训营 - 前端练习题汇总解析.md.D2cUYrDa.js
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import{_ as s,c as a,o as n,ai as i}from"./chunks/framework.BFSS5Pox.js";const u=JSON.parse('{"title":"【2023】青训营 - 前端练习题汇总解析","description":"","frontmatter":{},"headers":[],"relativePath":"article/【2023】青训营 - 前端练习题汇总解析.md","filePath":"article/【2023】青训营 - 前端练习题汇总解析.md","lastUpdated":1712924096000}'),l={name:"article/【2023】青训营 - 前端练习题汇总解析.md"},p=i(`<h1 id="【2023】青训营-前端练习题汇总解析" tabindex="-1">【2023】青训营 - 前端练习题汇总解析 <a class="header-anchor" href="#【2023】青训营-前端练习题汇总解析" aria-label="Permalink to &quot;【2023】青训营 - 前端练习题汇总解析&quot;">​</a></h1><p>汇总了青训营官方账号每天发布的练习题，并且给出了答案、做了简单解析与知识扩充，有不足之处欢迎一起交流学习。</p><p>每天的选择题不同，而编程题是一样的，直接去Leetcode刷题即可。</p><h2 id="选择题" tabindex="-1">选择题 <a class="header-anchor" href="#选择题" aria-label="Permalink to &quot;选择题&quot;">​</a></h2><h3 id="day-1" tabindex="-1">DAY 1 <a class="header-anchor" href="#day-1" aria-label="Permalink to &quot;DAY 1&quot;">​</a></h3><h4 id="题目描述" tabindex="-1">题目描述 <a class="header-anchor" href="#题目描述" aria-label="Permalink to &quot;题目描述&quot;">​</a></h4><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span>选择题 1： </span></span> import{_ as s,c as a,o as n,ai as i}from"./chunks/framework.DKE0jNKv.js";const u=JSON.parse('{"title":"【2023】青训营 - 前端练习题汇总解析","description":"","frontmatter":{},"headers":[],"relativePath":"article/【2023】青训营 - 前端练习题汇总解析.md","filePath":"article/【2023】青训营 - 前端练习题汇总解析.md","lastUpdated":1713715656000}'),l={name:"article/【2023】青训营 - 前端练习题汇总解析.md"},p=i(`<h1 id="【2023】青训营-前端练习题汇总解析" tabindex="-1">【2023】青训营 - 前端练习题汇总解析 <a class="header-anchor" href="#【2023】青训营-前端练习题汇总解析" aria-label="Permalink to &quot;【2023】青训营 - 前端练习题汇总解析&quot;">​</a></h1><p>汇总了青训营官方账号每天发布的练习题，并且给出了答案、做了简单解析与知识扩充，有不足之处欢迎一起交流学习。</p><p>每天的选择题不同，而编程题是一样的，直接去Leetcode刷题即可。</p><h2 id="选择题" tabindex="-1">选择题 <a class="header-anchor" href="#选择题" aria-label="Permalink to &quot;选择题&quot;">​</a></h2><h3 id="day-1" tabindex="-1">DAY 1 <a class="header-anchor" href="#day-1" aria-label="Permalink to &quot;DAY 1&quot;">​</a></h3><h4 id="题目描述" tabindex="-1">题目描述 <a class="header-anchor" href="#题目描述" aria-label="Permalink to &quot;题目描述&quot;">​</a></h4><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span>选择题 1： </span></span>
<span class="line"><span>下列哪些是 HTML5 的新特性？ </span></span> <span class="line"><span>下列哪些是 HTML5 的新特性？ </span></span>
<span class="line"><span>A. 语义标签 </span></span> <span class="line"><span>A. 语义标签 </span></span>
<span class="line"><span>B. Canvas 绘图 </span></span> <span class="line"><span>B. Canvas 绘图 </span></span>

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style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">([</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;1&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;2&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;3&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">].</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">map</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(parseInt))</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span>[1, NaN, NaN]</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="代码输出结果2" tabindex="-1">代码输出结果2 <a class="header-anchor" href="#代码输出结果2" aria-label="Permalink to &quot;代码输出结果2&quot;">​</a></h3><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">let</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> [a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, b] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> []</span></span> import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const o=JSON.parse('{"title":"【字节跳动】前端面试题总结","description":"","frontmatter":{},"headers":[],"relativePath":"article/【字节跳动】前端面试题总结.md","filePath":"article/【字节跳动】前端面试题总结.md","lastUpdated":1713715656000}'),l={name:"article/【字节跳动】前端面试题总结.md"},e=n(`<h1 id="【字节跳动】前端面试题总结" tabindex="-1">【字节跳动】前端面试题总结 <a class="header-anchor" href="#【字节跳动】前端面试题总结" aria-label="Permalink to &quot;【字节跳动】前端面试题总结&quot;">​</a></h1><h2 id="看代码说结果" tabindex="-1">看代码说结果 <a class="header-anchor" href="#看代码说结果" aria-label="Permalink to &quot;看代码说结果&quot;">​</a></h2><h3 id="代码输出结果1" tabindex="-1">代码输出结果1 <a class="header-anchor" href="#代码输出结果1" aria-label="Permalink to &quot;代码输出结果1&quot;">​</a></h3><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">([</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;1&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;2&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;3&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">].</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">map</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(parseInt))</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span>[1, NaN, NaN]</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="代码输出结果2" tabindex="-1">代码输出结果2 <a class="header-anchor" href="#代码输出结果2" aria-label="Permalink to &quot;代码输出结果2&quot;">​</a></h3><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">let</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> [a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, b] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> []</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(a, b)</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span>1 undefined</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="代码输出结果3" tabindex="-1">代码输出结果3 <a class="header-anchor" href="#代码输出结果3" aria-label="Permalink to &quot;代码输出结果3&quot;">​</a></h3><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">Promise</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">resolve</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">()</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(a, b)</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span>1 undefined</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="代码输出结果3" tabindex="-1">代码输出结果3 <a class="header-anchor" href="#代码输出结果3" aria-label="Permalink to &quot;代码输出结果3&quot;">​</a></h3><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">Promise</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">resolve</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">()</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> .</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">then</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> .</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">then</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> Promise</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">resolve</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">()</span></span> <span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> Promise</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">resolve</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">()</span></span>

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import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const o=JSON.parse('{"title":"【字节跳动】前端面试题总结","description":"","frontmatter":{},"headers":[],"relativePath":"article/【字节跳动】前端面试题总结.md","filePath":"article/【字节跳动】前端面试题总结.md","lastUpdated":1712924096000}'),l={name:"article/【字节跳动】前端面试题总结.md"},e=n("",36),h=[e];function p(t,k,r,d,E,c){return a(),i("div",null,h)}const y=s(l,[["render",p]]);export{o as __pageData,y as default}; import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const o=JSON.parse('{"title":"【字节跳动】前端面试题总结","description":"","frontmatter":{},"headers":[],"relativePath":"article/【字节跳动】前端面试题总结.md","filePath":"article/【字节跳动】前端面试题总结.md","lastUpdated":1713715656000}'),l={name:"article/【字节跳动】前端面试题总结.md"},e=n("",36),h=[e];function p(t,k,r,d,E,c){return a(),i("div",null,h)}const y=s(l,[["render",p]]);export{o as __pageData,y as default};

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import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const g=JSON.parse('{"title":"【快手】深入理解前端面试题","description":"","frontmatter":{},"headers":[],"relativePath":"article/【快手】深入理解前端面试题.md","filePath":"article/【快手】深入理解前端面试题.md","lastUpdated":1712924096000}'),l={name:"article/【快手】深入理解前端面试题.md"},e=n(`<h1 id="【快手】深入理解前端面试题" tabindex="-1">【快手】深入理解前端面试题 <a class="header-anchor" href="#【快手】深入理解前端面试题" aria-label="Permalink to &quot;【快手】深入理解前端面试题&quot;">​</a></h1><h2 id="快手一面" tabindex="-1">快手一面 <a class="header-anchor" href="#快手一面" aria-label="Permalink to &quot;快手一面&quot;">​</a></h2><h3 id="vue生命周期" tabindex="-1">Vue生命周期 <a class="header-anchor" href="#vue生命周期" aria-label="Permalink to &quot;Vue生命周期&quot;">​</a></h3><p><code>beforeCreate created beforeMount mounted</code></p><p><code>beforeUpdate updated</code></p><p><code>beforeDestory destoryed</code></p><p>Vue3移除了<code>beforeCreate</code> <code>created</code>两个声明周期钩子，这是因为setup发生在开始创建组件之前，在<code>beforeCreate</code>和<code>created</code>之前执行</p><p>可以在setup中使用的生命周期函数：<code>onMounted</code> <code>onUpdated</code> <code>onUnmounted</code> <code>onBeforeUpdate</code>这几个，</p><p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/a299bd2229fb45d68a1cdd8731c94449~tplv-k3u1fbpfcp-zoom-1.image" alt="Vue 生命周期" loading="lazy"></p><h3 id="网络请求一般在什么时候发起-为什么" tabindex="-1">网络请求一般在什么时候发起，为什么 <a class="header-anchor" href="#网络请求一般在什么时候发起-为什么" aria-label="Permalink to &quot;网络请求一般在什么时候发起，为什么&quot;">​</a></h3><p>越早越好，一般是放在<code>created</code>或<code>onMounted</code>或者<code>setup</code>中</p><ul><li><code>created</code>(vue2) 此时组件内的基本数据已经创建好，组件的模板结构尚未生成</li><li><code>mounted</code>(vue2) <code>onMounted</code>(vue3) 组件挂载到DOM树上，可以获取到DOM</li><li><code>setup</code>(vue3) 时机要早于<code>beforeCreated</code>和<code>created</code> 所以在setup中发起网络请求也可以</li></ul><h3 id="setup的执行时机相当于哪个生命周期" tabindex="-1">setup的执行时机相当于哪个生命周期 <a class="header-anchor" href="#setup的执行时机相当于哪个生命周期" aria-label="Permalink to &quot;setup的执行时机相当于哪个生命周期&quot;">​</a></h3><p><code>setup</code>的执行要早于<code>beforeCreated</code>和<code>created</code>，可以认为相当于这两个生命周期</p><h3 id="vue2和vue3的响应式原理" tabindex="-1">Vue2和Vue3的响应式原理 <a class="header-anchor" href="#vue2和vue3的响应式原理" aria-label="Permalink to &quot;Vue2和Vue3的响应式原理&quot;">​</a></h3><h4 id="vue2响应式原理" tabindex="-1">Vue2响应式原理 <a class="header-anchor" href="#vue2响应式原理" aria-label="Permalink to &quot;Vue2响应式原理&quot;">​</a></h4><p>全部使用<code>Object.defineProperty()</code>中的set与get函数</p><h4 id="vue3响应式原理" tabindex="-1">Vue3响应式原理 <a class="header-anchor" href="#vue3响应式原理" aria-label="Permalink to &quot;Vue3响应式原理&quot;">​</a></h4><p><code>ref</code>使用的是<code>Object.defineProperty()</code>，而<code>reactive</code>使用的是<code>Proxy</code></p><p><code>Proxy</code>可以直接深度代理一个对象，通过设置handler中的捕获器可以对对象创建一个代理，将各种行为监听并且同步到对象本身上</p><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> obj</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span> import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const g=JSON.parse('{"title":"【快手】深入理解前端面试题","description":"","frontmatter":{},"headers":[],"relativePath":"article/【快手】深入理解前端面试题.md","filePath":"article/【快手】深入理解前端面试题.md","lastUpdated":1713715656000}'),l={name:"article/【快手】深入理解前端面试题.md"},e=n(`<h1 id="【快手】深入理解前端面试题" tabindex="-1">【快手】深入理解前端面试题 <a class="header-anchor" href="#【快手】深入理解前端面试题" aria-label="Permalink to &quot;【快手】深入理解前端面试题&quot;">​</a></h1><h2 id="快手一面" tabindex="-1">快手一面 <a class="header-anchor" href="#快手一面" aria-label="Permalink to &quot;快手一面&quot;">​</a></h2><h3 id="vue生命周期" tabindex="-1">Vue生命周期 <a class="header-anchor" href="#vue生命周期" aria-label="Permalink to &quot;Vue生命周期&quot;">​</a></h3><p><code>beforeCreate created beforeMount mounted</code></p><p><code>beforeUpdate updated</code></p><p><code>beforeDestory destoryed</code></p><p>Vue3移除了<code>beforeCreate</code> <code>created</code>两个声明周期钩子，这是因为setup发生在开始创建组件之前，在<code>beforeCreate</code>和<code>created</code>之前执行</p><p>可以在setup中使用的生命周期函数：<code>onMounted</code> <code>onUpdated</code> <code>onUnmounted</code> <code>onBeforeUpdate</code>这几个，</p><p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/a299bd2229fb45d68a1cdd8731c94449~tplv-k3u1fbpfcp-zoom-1.image" alt="Vue 生命周期" loading="lazy"></p><h3 id="网络请求一般在什么时候发起-为什么" tabindex="-1">网络请求一般在什么时候发起，为什么 <a class="header-anchor" href="#网络请求一般在什么时候发起-为什么" aria-label="Permalink to &quot;网络请求一般在什么时候发起，为什么&quot;">​</a></h3><p>越早越好，一般是放在<code>created</code>或<code>onMounted</code>或者<code>setup</code>中</p><ul><li><code>created</code>(vue2) 此时组件内的基本数据已经创建好，组件的模板结构尚未生成</li><li><code>mounted</code>(vue2) <code>onMounted</code>(vue3) 组件挂载到DOM树上，可以获取到DOM</li><li><code>setup</code>(vue3) 时机要早于<code>beforeCreated</code>和<code>created</code> 所以在setup中发起网络请求也可以</li></ul><h3 id="setup的执行时机相当于哪个生命周期" tabindex="-1">setup的执行时机相当于哪个生命周期 <a class="header-anchor" href="#setup的执行时机相当于哪个生命周期" aria-label="Permalink to &quot;setup的执行时机相当于哪个生命周期&quot;">​</a></h3><p><code>setup</code>的执行要早于<code>beforeCreated</code>和<code>created</code>，可以认为相当于这两个生命周期</p><h3 id="vue2和vue3的响应式原理" tabindex="-1">Vue2和Vue3的响应式原理 <a class="header-anchor" href="#vue2和vue3的响应式原理" aria-label="Permalink to &quot;Vue2和Vue3的响应式原理&quot;">​</a></h3><h4 id="vue2响应式原理" tabindex="-1">Vue2响应式原理 <a class="header-anchor" href="#vue2响应式原理" aria-label="Permalink to &quot;Vue2响应式原理&quot;">​</a></h4><p>全部使用<code>Object.defineProperty()</code>中的set与get函数</p><h4 id="vue3响应式原理" tabindex="-1">Vue3响应式原理 <a class="header-anchor" href="#vue3响应式原理" aria-label="Permalink to &quot;Vue3响应式原理&quot;">​</a></h4><p><code>ref</code>使用的是<code>Object.defineProperty()</code>，而<code>reactive</code>使用的是<code>Proxy</code></p><p><code>Proxy</code>可以直接深度代理一个对象，通过设置handler中的捕获器可以对对象创建一个代理，将各种行为监听并且同步到对象本身上</p><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> obj</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> name: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;Ziu&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">,</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> name: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;Ziu&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">,</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> age: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">18</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> age: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">18</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span>

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import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const g=JSON.parse('{"title":"【用友金融】前端面试题总结","description":"","frontmatter":{},"headers":[],"relativePath":"article/【用友金融】前端面试题总结.md","filePath":"article/【用友金融】前端面试题总结.md","lastUpdated":1712924096000}'),l={name:"article/【用友金融】前端面试题总结.md"},e=n(`<h1 id="【用友金融】前端面试题总结" tabindex="-1">【用友金融】前端面试题总结 <a class="header-anchor" href="#【用友金融】前端面试题总结" aria-label="Permalink to &quot;【用友金融】前端面试题总结&quot;">​</a></h1><h2 id="回流与重绘" tabindex="-1">回流与重绘 <a class="header-anchor" href="#回流与重绘" aria-label="Permalink to &quot;回流与重绘&quot;">​</a></h2><p>下列关于回流和重绘的说法错误的是</p><ul><li><p>回流的性能开销大于重绘的性能开销</p></li><li><p>当页面结构、尺寸等改变时会发生回流</p></li><li><p>回流一定会引起重绘，重绘也一定会引起回流(x)</p></li><li><p>当页面结构不改变只是样式发生改变时会发生重绘，例如背景颜色改变时会发生重绘</p></li><li><p><code>display: none</code> 指的是元素完全不陈列出来，不占据空间，涉及到了DOM结构，故产生reflow与repaint</p></li><li><p><code>visibility: hidden</code> 指的是元素不可见但存在，保留空间，不影响结构，故只产生repaint，但不可触发绑定事件</p></li><li><p><code>opacity: 0</code> 指的是元素不可见但存在，保留空间，不影响结构，并且，如果该元素已经绑定一些事件，如click事件，那么点击该区域，也能触发点击事件的</p></li></ul><h2 id="css属性" tabindex="-1">CSS属性 <a class="header-anchor" href="#css属性" aria-label="Permalink to &quot;CSS属性&quot;">​</a></h2><p>下列选项中哪个描述对于visibility: hidden;与display: none;是正确的</p><ul><li>visibility属性不可继承</li><li>visibility: hidden; 不占据页面空间</li><li>display: none; 不占据页面空间(√)</li><li>都无法通过DOM交互</li></ul><h2 id="函数执行结果" tabindex="-1">函数执行结果 <a class="header-anchor" href="#函数执行结果" aria-label="Permalink to &quot;函数执行结果&quot;">​</a></h2><h3 id="题目1" tabindex="-1">题目1 <a class="header-anchor" href="#题目1" aria-label="Permalink to &quot;题目1&quot;">​</a></h3><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> () {</span></span> import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const g=JSON.parse('{"title":"【用友金融】前端面试题总结","description":"","frontmatter":{},"headers":[],"relativePath":"article/【用友金融】前端面试题总结.md","filePath":"article/【用友金融】前端面试题总结.md","lastUpdated":1713715656000}'),l={name:"article/【用友金融】前端面试题总结.md"},e=n(`<h1 id="【用友金融】前端面试题总结" tabindex="-1">【用友金融】前端面试题总结 <a class="header-anchor" href="#【用友金融】前端面试题总结" aria-label="Permalink to &quot;【用友金融】前端面试题总结&quot;">​</a></h1><h2 id="回流与重绘" tabindex="-1">回流与重绘 <a class="header-anchor" href="#回流与重绘" aria-label="Permalink to &quot;回流与重绘&quot;">​</a></h2><p>下列关于回流和重绘的说法错误的是</p><ul><li><p>回流的性能开销大于重绘的性能开销</p></li><li><p>当页面结构、尺寸等改变时会发生回流</p></li><li><p>回流一定会引起重绘，重绘也一定会引起回流(x)</p></li><li><p>当页面结构不改变只是样式发生改变时会发生重绘，例如背景颜色改变时会发生重绘</p></li><li><p><code>display: none</code> 指的是元素完全不陈列出来，不占据空间，涉及到了DOM结构，故产生reflow与repaint</p></li><li><p><code>visibility: hidden</code> 指的是元素不可见但存在，保留空间，不影响结构，故只产生repaint，但不可触发绑定事件</p></li><li><p><code>opacity: 0</code> 指的是元素不可见但存在，保留空间，不影响结构，并且，如果该元素已经绑定一些事件，如click事件，那么点击该区域，也能触发点击事件的</p></li></ul><h2 id="css属性" tabindex="-1">CSS属性 <a class="header-anchor" href="#css属性" aria-label="Permalink to &quot;CSS属性&quot;">​</a></h2><p>下列选项中哪个描述对于visibility: hidden;与display: none;是正确的</p><ul><li>visibility属性不可继承</li><li>visibility: hidden; 不占据页面空间</li><li>display: none; 不占据页面空间(√)</li><li>都无法通过DOM交互</li></ul><h2 id="函数执行结果" tabindex="-1">函数执行结果 <a class="header-anchor" href="#函数执行结果" aria-label="Permalink to &quot;函数执行结果&quot;">​</a></h2><h3 id="题目1" tabindex="-1">题目1 <a class="header-anchor" href="#题目1" aria-label="Permalink to &quot;题目1&quot;">​</a></h3><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> () {</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> var</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (b </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 5</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> var</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (b </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 5</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">})();</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">})();</span></span>
<span class="line"></span> <span class="line"></span>

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assets/article_【用友金融】前端面试题总结.md.DWiFHJcX.lean.js → assets/article_【用友金融】前端面试题总结.md.DJOGJhtH.lean.js
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import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const g=JSON.parse('{"title":"【用友金融】前端面试题总结","description":"","frontmatter":{},"headers":[],"relativePath":"article/【用友金融】前端面试题总结.md","filePath":"article/【用友金融】前端面试题总结.md","lastUpdated":1712924096000}'),l={name:"article/【用友金融】前端面试题总结.md"},e=n("",71),p=[e];function h(t,r,k,d,c,o){return a(),i("div",null,p)}const b=s(l,[["render",h]]);export{g as __pageData,b as default}; import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const g=JSON.parse('{"title":"【用友金融】前端面试题总结","description":"","frontmatter":{},"headers":[],"relativePath":"article/【用友金融】前端面试题总结.md","filePath":"article/【用友金融】前端面试题总结.md","lastUpdated":1713715656000}'),l={name:"article/【用友金融】前端面试题总结.md"},e=n("",71),p=[e];function h(t,r,k,d,c,o){return a(),i("div",null,p)}const b=s(l,[["render",h]]);export{g as __pageData,b as default};

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assets/article_一文读懂事件冒泡与事件捕获.md.Bb4Daxaa.js → assets/article_一文读懂事件冒泡与事件捕获.md.CSKfl6Zb.js
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import{_ as s,c as i,o as a,ai as e}from"./chunks/framework.BFSS5Pox.js";const g=JSON.parse('{"title":"一文读懂事件冒泡与事件捕获","description":"","frontmatter":{},"headers":[],"relativePath":"article/一文读懂事件冒泡与事件捕获.md","filePath":"article/一文读懂事件冒泡与事件捕获.md","lastUpdated":1712924096000}'),n={name:"article/一文读懂事件冒泡与事件捕获.md"},t=e(`<h1 id="一文读懂事件冒泡与事件捕获" tabindex="-1">一文读懂事件冒泡与事件捕获 <a class="header-anchor" href="#一文读懂事件冒泡与事件捕获" aria-label="Permalink to &quot;一文读懂事件冒泡与事件捕获&quot;">​</a></h1><h2 id="💡-从例子入手" tabindex="-1">💡 从例子入手 <a class="header-anchor" href="#💡-从例子入手" aria-label="Permalink to &quot;💡 从例子入手&quot;">​</a></h2><p>这是一个<a href="https://mdn.github.io/learning-area/javascript/building-blocks/events/show-video-box.html" target="_blank" rel="noreferrer">简单的 Demo</a>，点击的 <code>Display video</code> 按钮后，将视频展示出来。</p><p>其中的视频 <code>&lt;video&gt;</code> 标签被 <code>&lt;div&gt;</code> 包裹，<code>&lt;div&gt;</code> 与 <code>&lt;video&gt;</code> 上都绑定了自己的 <code>click</code> 事件。</p><p><a href="https://code.juejin.cn/pen/7092947625791455262" target="_blank" rel="noreferrer">代码片段</a></p><p>我们的预期是：点击 <code>&lt;video&gt;</code> 时播放视频，点击 <code>&lt;div&gt;</code> 时隐藏视频，然而实际上你会发现，点击视频后，不仅视频虽然正常播放，但同时也被隐藏了。</p><p>点击子元素，父元素的事件也被触发，导致这种现象的原因正是：<strong>浏览器的事件冒泡机制</strong>。</p><h2 id="🤔-什么是事件冒泡机制-事件捕获又是什么" tabindex="-1">🤔 什么是事件冒泡机制？事件捕获又是什么？ <a class="header-anchor" href="#🤔-什么是事件冒泡机制-事件捕获又是什么" aria-label="Permalink to &quot;🤔 什么是事件冒泡机制？事件捕获又是什么？&quot;">​</a></h2><p>现代浏览器提供了两种事件处理阶段：<strong>捕获阶段与冒泡阶段</strong>，</p><p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/712c504b08f946088fc51dd5f8959020~tplv-k3u1fbpfcp-zoom-1.image" alt="bubbling-capturing.png" loading="lazy"></p><blockquote><p>在捕获阶段：</p><ul><li>浏览器检查元素的最外层祖先 <code>&lt;html&gt;</code> ，是否在捕获阶段中注册了一个 <code>onclick</code> 事件处理程序，如果是，则运行它。</li><li>然后，它移动到 <code>&lt;html&gt;</code> 中单击元素的下一个祖先元素，执行相同的操作，然后是单击元素再下一个祖先元素，依此类推，直到到达实际点击的元素。</li></ul></blockquote><blockquote><p>在冒泡阶段，与上述顺序相反：</p><ul><li>浏览器检查实际点击的元素是否在冒泡阶段中注册了一个 <code>onclick</code> 事件处理程序，如果是，则运行它</li><li>然后它移动到下一个直接的祖先元素，并做同样的事情，然后是下一个，等等，直到它到达 <code>&lt;html&gt;</code> 元素。</li></ul></blockquote><p>当一个事件被触发时，浏览器<strong>先运行捕获阶段，后运行冒泡阶段</strong>，并且在默认情况下，<strong>所有事件处理程序都在冒泡阶段进行注册</strong>。</p><p>针对上面提到的问题，我们可以知道：当 <code>&lt;video&gt;</code> 点击事件触发后，虽然我们没有主动触发 <code>&lt;div&gt;</code> 上绑定的点击事件，但由于冒泡机制，点击事件冒泡到了 <code>&lt;div&gt;</code> 上，并触发了绑定在其上的监听回调函数，将 <code>&lt;video&gt;</code> 标签隐藏。</p><h3 id="📌-用例子验证结论" tabindex="-1">📌 用例子验证结论 <a class="header-anchor" href="#📌-用例子验证结论" aria-label="Permalink to &quot;📌 用例子验证结论&quot;">​</a></h3><p>下面是一个用于验证上述结论的Demo：</p><p>页面中包括由外向内的三个类名不同的div标签： <code>div1</code> <code>div2</code> <code>div3</code>，并为他们在捕获阶段/冒泡阶段分别绑定了不同的事件函数 <code>click</code> 和 <code>dblclick</code>。</p><p><a href="https://code.juejin.cn/pen/7092975347720781861" target="_blank" rel="noreferrer">代码片段</a></p><p>当点击最内部的 <code>div3</code> 后，浏览器控制台输出：</p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span>&gt; 捕获 click div1</span></span> import{_ as s,c as i,o as a,ai as e}from"./chunks/framework.DKE0jNKv.js";const g=JSON.parse('{"title":"一文读懂事件冒泡与事件捕获","description":"","frontmatter":{},"headers":[],"relativePath":"article/一文读懂事件冒泡与事件捕获.md","filePath":"article/一文读懂事件冒泡与事件捕获.md","lastUpdated":1713715656000}'),n={name:"article/一文读懂事件冒泡与事件捕获.md"},t=e(`<h1 id="一文读懂事件冒泡与事件捕获" tabindex="-1">一文读懂事件冒泡与事件捕获 <a class="header-anchor" href="#一文读懂事件冒泡与事件捕获" aria-label="Permalink to &quot;一文读懂事件冒泡与事件捕获&quot;">​</a></h1><h2 id="💡-从例子入手" tabindex="-1">💡 从例子入手 <a class="header-anchor" href="#💡-从例子入手" aria-label="Permalink to &quot;💡 从例子入手&quot;">​</a></h2><p>这是一个<a href="https://mdn.github.io/learning-area/javascript/building-blocks/events/show-video-box.html" target="_blank" rel="noreferrer">简单的 Demo</a>，点击的 <code>Display video</code> 按钮后，将视频展示出来。</p><p>其中的视频 <code>&lt;video&gt;</code> 标签被 <code>&lt;div&gt;</code> 包裹，<code>&lt;div&gt;</code> 与 <code>&lt;video&gt;</code> 上都绑定了自己的 <code>click</code> 事件。</p><p><a href="https://code.juejin.cn/pen/7092947625791455262" target="_blank" rel="noreferrer">代码片段</a></p><p>我们的预期是：点击 <code>&lt;video&gt;</code> 时播放视频，点击 <code>&lt;div&gt;</code> 时隐藏视频，然而实际上你会发现，点击视频后，不仅视频虽然正常播放，但同时也被隐藏了。</p><p>点击子元素，父元素的事件也被触发，导致这种现象的原因正是：<strong>浏览器的事件冒泡机制</strong>。</p><h2 id="🤔-什么是事件冒泡机制-事件捕获又是什么" tabindex="-1">🤔 什么是事件冒泡机制？事件捕获又是什么？ <a class="header-anchor" href="#🤔-什么是事件冒泡机制-事件捕获又是什么" aria-label="Permalink to &quot;🤔 什么是事件冒泡机制？事件捕获又是什么？&quot;">​</a></h2><p>现代浏览器提供了两种事件处理阶段：<strong>捕获阶段与冒泡阶段</strong>，</p><p><img src="https://p3-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/712c504b08f946088fc51dd5f8959020~tplv-k3u1fbpfcp-zoom-1.image" alt="bubbling-capturing.png" loading="lazy"></p><blockquote><p>在捕获阶段：</p><ul><li>浏览器检查元素的最外层祖先 <code>&lt;html&gt;</code> ，是否在捕获阶段中注册了一个 <code>onclick</code> 事件处理程序，如果是，则运行它。</li><li>然后，它移动到 <code>&lt;html&gt;</code> 中单击元素的下一个祖先元素，执行相同的操作，然后是单击元素再下一个祖先元素，依此类推，直到到达实际点击的元素。</li></ul></blockquote><blockquote><p>在冒泡阶段，与上述顺序相反：</p><ul><li>浏览器检查实际点击的元素是否在冒泡阶段中注册了一个 <code>onclick</code> 事件处理程序，如果是，则运行它</li><li>然后它移动到下一个直接的祖先元素，并做同样的事情，然后是下一个，等等，直到它到达 <code>&lt;html&gt;</code> 元素。</li></ul></blockquote><p>当一个事件被触发时，浏览器<strong>先运行捕获阶段，后运行冒泡阶段</strong>，并且在默认情况下，<strong>所有事件处理程序都在冒泡阶段进行注册</strong>。</p><p>针对上面提到的问题，我们可以知道：当 <code>&lt;video&gt;</code> 点击事件触发后，虽然我们没有主动触发 <code>&lt;div&gt;</code> 上绑定的点击事件，但由于冒泡机制，点击事件冒泡到了 <code>&lt;div&gt;</code> 上，并触发了绑定在其上的监听回调函数，将 <code>&lt;video&gt;</code> 标签隐藏。</p><h3 id="📌-用例子验证结论" tabindex="-1">📌 用例子验证结论 <a class="header-anchor" href="#📌-用例子验证结论" aria-label="Permalink to &quot;📌 用例子验证结论&quot;">​</a></h3><p>下面是一个用于验证上述结论的Demo：</p><p>页面中包括由外向内的三个类名不同的div标签： <code>div1</code> <code>div2</code> <code>div3</code>，并为他们在捕获阶段/冒泡阶段分别绑定了不同的事件函数 <code>click</code> 和 <code>dblclick</code>。</p><p><a href="https://code.juejin.cn/pen/7092975347720781861" target="_blank" rel="noreferrer">代码片段</a></p><p>当点击最内部的 <code>div3</code> 后，浏览器控制台输出：</p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span>&gt; 捕获 click div1</span></span>
<span class="line"><span>&gt; 捕获 click div2</span></span> <span class="line"><span>&gt; 捕获 click div2</span></span>
<span class="line"><span>&gt; 捕获 click div3</span></span> <span class="line"><span>&gt; 捕获 click div3</span></span>
<span class="line"><span>&gt; 冒泡 click div3</span></span> <span class="line"><span>&gt; 冒泡 click div3</span></span>

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assets/article_一文读懂事件冒泡与事件捕获.md.Bb4Daxaa.lean.js → assets/article_一文读懂事件冒泡与事件捕获.md.CSKfl6Zb.lean.js
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import{_ as s,c as i,o as a,ai as e}from"./chunks/framework.BFSS5Pox.js";const g=JSON.parse('{"title":"一文读懂事件冒泡与事件捕获","description":"","frontmatter":{},"headers":[],"relativePath":"article/一文读懂事件冒泡与事件捕获.md","filePath":"article/一文读懂事件冒泡与事件捕获.md","lastUpdated":1712924096000}'),n={name:"article/一文读懂事件冒泡与事件捕获.md"},t=e("",63),l=[t];function p(r,h,d,k,c,o){return a(),i("div",null,l)}const u=s(n,[["render",p]]);export{g as __pageData,u as default}; import{_ as s,c as i,o as a,ai as e}from"./chunks/framework.DKE0jNKv.js";const g=JSON.parse('{"title":"一文读懂事件冒泡与事件捕获","description":"","frontmatter":{},"headers":[],"relativePath":"article/一文读懂事件冒泡与事件捕获.md","filePath":"article/一文读懂事件冒泡与事件捕获.md","lastUpdated":1713715656000}'),n={name:"article/一文读懂事件冒泡与事件捕获.md"},t=e("",63),l=[t];function p(r,h,d,k,c,o){return a(),i("div",null,l)}const u=s(n,[["render",p]]);export{g as __pageData,u as default};

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assets/article_一文读懂伪类与伪元素.md.d_UVOaKS.js → assets/article_一文读懂伪类与伪元素.md.Cs43WEkp.js
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import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const g=JSON.parse('{"title":"一文读懂伪类与伪元素","description":"","frontmatter":{},"headers":[],"relativePath":"article/一文读懂伪类与伪元素.md","filePath":"article/一文读懂伪类与伪元素.md","lastUpdated":1712924096000}'),l={name:"article/一文读懂伪类与伪元素.md"},e=n(`<h1 id="一文读懂伪类与伪元素" tabindex="-1">一文读懂伪类与伪元素 <a class="header-anchor" href="#一文读懂伪类与伪元素" aria-label="Permalink to &quot;一文读懂伪类与伪元素&quot;">​</a></h1><h2 id="🔰-什么是伪类" tabindex="-1">🔰 什么是伪类？ <a class="header-anchor" href="#🔰-什么是伪类" aria-label="Permalink to &quot;🔰 什么是伪类？&quot;">​</a></h2><p>伪类是添加到选择器的 <strong>关键字</strong> ，指定要选择的元素的特殊状态。</p><h3 id="典型的伪类关键字" tabindex="-1">典型的伪类关键字 <a class="header-anchor" href="#典型的伪类关键字" aria-label="Permalink to &quot;典型的伪类关键字&quot;">​</a></h3><p>在大多数情况下，<strong>伪类都与基础选择器搭配使用</strong>，下述是伪类在一些典型场景下的应用。</p><h4 id="hover" tabindex="-1"><code>:hover</code> <a class="header-anchor" href="#hover" aria-label="Permalink to &quot;\`:hover\`&quot;">​</a></h4><p>指针在 <code>&lt;button&gt;</code> 上悬停，但没有激活它时，按钮颜色变为蓝色</p><div class="language-css vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">css</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">button</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">:hover</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span> import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const g=JSON.parse('{"title":"一文读懂伪类与伪元素","description":"","frontmatter":{},"headers":[],"relativePath":"article/一文读懂伪类与伪元素.md","filePath":"article/一文读懂伪类与伪元素.md","lastUpdated":1713715656000}'),l={name:"article/一文读懂伪类与伪元素.md"},e=n(`<h1 id="一文读懂伪类与伪元素" tabindex="-1">一文读懂伪类与伪元素 <a class="header-anchor" href="#一文读懂伪类与伪元素" aria-label="Permalink to &quot;一文读懂伪类与伪元素&quot;">​</a></h1><h2 id="🔰-什么是伪类" tabindex="-1">🔰 什么是伪类？ <a class="header-anchor" href="#🔰-什么是伪类" aria-label="Permalink to &quot;🔰 什么是伪类？&quot;">​</a></h2><p>伪类是添加到选择器的 <strong>关键字</strong> ，指定要选择的元素的特殊状态。</p><h3 id="典型的伪类关键字" tabindex="-1">典型的伪类关键字 <a class="header-anchor" href="#典型的伪类关键字" aria-label="Permalink to &quot;典型的伪类关键字&quot;">​</a></h3><p>在大多数情况下，<strong>伪类都与基础选择器搭配使用</strong>，下述是伪类在一些典型场景下的应用。</p><h4 id="hover" tabindex="-1"><code>:hover</code> <a class="header-anchor" href="#hover" aria-label="Permalink to &quot;\`:hover\`&quot;">​</a></h4><p>指针在 <code>&lt;button&gt;</code> 上悬停，但没有激活它时，按钮颜色变为蓝色</p><div class="language-css vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">css</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">button</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">:hover</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> color</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">blue</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span> <span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> color</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">blue</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><blockquote><p><strong>注意</strong>: 在触摸屏上 <code>:hover</code> 基本不可用。不同的浏览器上<code>:hover</code> 伪类表现不同。网页开发人员不要让任何内容只能通过悬停才能展示出来，不然这些内容对于触摸屏使用者来说是很难或者说不可能看到。</p></blockquote><h4 id="not" tabindex="-1"><code>:not</code> <a class="header-anchor" href="#not" aria-label="Permalink to &quot;\`:not\`&quot;">​</a></h4><p><strong><code>:not()</code></strong> 用来匹配不符合一组选择器的元素。由于它的作用是防止特定的元素被选中，它也被称为<em>反选伪类</em>（<em>negation pseudo-class</em>）。</p><p>将所有不是<code>&lt;p&gt;</code>的元素颜色改为蓝色：</p><div class="language-css vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">css</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">body</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">:not</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">p</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br></div></div><blockquote><p><strong>注意</strong>: 在触摸屏上 <code>:hover</code> 基本不可用。不同的浏览器上<code>:hover</code> 伪类表现不同。网页开发人员不要让任何内容只能通过悬停才能展示出来，不然这些内容对于触摸屏使用者来说是很难或者说不可能看到。</p></blockquote><h4 id="not" tabindex="-1"><code>:not</code> <a class="header-anchor" href="#not" aria-label="Permalink to &quot;\`:not\`&quot;">​</a></h4><p><strong><code>:not()</code></strong> 用来匹配不符合一组选择器的元素。由于它的作用是防止特定的元素被选中，它也被称为<em>反选伪类</em>（<em>negation pseudo-class</em>）。</p><p>将所有不是<code>&lt;p&gt;</code>的元素颜色改为蓝色：</p><div class="language-css vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">css</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">body</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">:not</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">p</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span>
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> color</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">blue</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span> <span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> color</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">blue</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>

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assets/article_一文读懂伪类与伪元素.md.d_UVOaKS.lean.js → assets/article_一文读懂伪类与伪元素.md.Cs43WEkp.lean.js
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import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const g=JSON.parse('{"title":"一文读懂伪类与伪元素","description":"","frontmatter":{},"headers":[],"relativePath":"article/一文读懂伪类与伪元素.md","filePath":"article/一文读懂伪类与伪元素.md","lastUpdated":1712924096000}'),l={name:"article/一文读懂伪类与伪元素.md"},e=n("",56),p=[e];function h(t,k,r,d,c,E){return a(),i("div",null,p)}const b=s(l,[["render",h]]);export{g as __pageData,b as default}; import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const g=JSON.parse('{"title":"一文读懂伪类与伪元素","description":"","frontmatter":{},"headers":[],"relativePath":"article/一文读懂伪类与伪元素.md","filePath":"article/一文读懂伪类与伪元素.md","lastUpdated":1713715656000}'),l={name:"article/一文读懂伪类与伪元素.md"},e=n("",56),p=[e];function h(t,k,r,d,c,E){return a(),i("div",null,p)}const b=s(l,[["render",h]]);export{g as __pageData,b as default};

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assets/article_一文读懂函数中this指向问题.md.C3i2qQZI.js → assets/article_一文读懂函数中this指向问题.md.BUCE8mOc.js
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import{_ as s,c as n,o as a,ai as p}from"./chunks/framework.BFSS5Pox.js";const h=JSON.parse('{"title":"一文读懂函数中this指向问题","description":"","frontmatter":{},"headers":[],"relativePath":"article/一文读懂函数中this指向问题.md","filePath":"article/一文读懂函数中this指向问题.md","lastUpdated":1712924096000}'),e={name:"article/一文读懂函数中this指向问题.md"},l=p(`<h1 id="一文读懂函数中this指向问题" tabindex="-1">一文读懂函数中this指向问题 <a class="header-anchor" href="#一文读懂函数中this指向问题" aria-label="Permalink to &quot;一文读懂函数中this指向问题&quot;">​</a></h1><h2 id="函数中this指向" tabindex="-1">函数中this指向 <a class="header-anchor" href="#函数中this指向" aria-label="Permalink to &quot;函数中this指向&quot;">​</a></h2><p>函数在调用时, Javascript会默认为this绑定一个值</p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span>// 定义一个函数</span></span> import{_ as s,c as n,o as a,ai as p}from"./chunks/framework.DKE0jNKv.js";const h=JSON.parse('{"title":"一文读懂函数中this指向问题","description":"","frontmatter":{},"headers":[],"relativePath":"article/一文读懂函数中this指向问题.md","filePath":"article/一文读懂函数中this指向问题.md","lastUpdated":1713715656000}'),e={name:"article/一文读懂函数中this指向问题.md"},l=p(`<h1 id="一文读懂函数中this指向问题" tabindex="-1">一文读懂函数中this指向问题 <a class="header-anchor" href="#一文读懂函数中this指向问题" aria-label="Permalink to &quot;一文读懂函数中this指向问题&quot;">​</a></h1><h2 id="函数中this指向" tabindex="-1">函数中this指向 <a class="header-anchor" href="#函数中this指向" aria-label="Permalink to &quot;函数中this指向&quot;">​</a></h2><p>函数在调用时, Javascript会默认为this绑定一个值</p><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span>// 定义一个函数</span></span>
<span class="line"><span>function foo() {</span></span> <span class="line"><span>function foo() {</span></span>
<span class="line"><span>  console.log(this)</span></span> <span class="line"><span>  console.log(this)</span></span>
<span class="line"><span>}</span></span> <span class="line"><span>}</span></span>

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assets/article_一文读懂函数中this指向问题.md.C3i2qQZI.lean.js → assets/article_一文读懂函数中this指向问题.md.BUCE8mOc.lean.js
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import{_ as s,c as n,o as a,ai as p}from"./chunks/framework.BFSS5Pox.js";const h=JSON.parse('{"title":"一文读懂函数中this指向问题","description":"","frontmatter":{},"headers":[],"relativePath":"article/一文读懂函数中this指向问题.md","filePath":"article/一文读懂函数中this指向问题.md","lastUpdated":1712924096000}'),e={name:"article/一文读懂函数中this指向问题.md"},l=p("",59),i=[l];function c(r,o,b,t,d,u){return a(),n("div",null,i)}const g=s(e,[["render",c]]);export{h as __pageData,g as default}; import{_ as s,c as n,o as a,ai as p}from"./chunks/framework.DKE0jNKv.js";const h=JSON.parse('{"title":"一文读懂函数中this指向问题","description":"","frontmatter":{},"headers":[],"relativePath":"article/一文读懂函数中this指向问题.md","filePath":"article/一文读懂函数中this指向问题.md","lastUpdated":1713715656000}'),e={name:"article/一文读懂函数中this指向问题.md"},l=p("",59),i=[l];function c(r,o,b,t,d,u){return a(),n("div",null,i)}const g=s(e,[["render",c]]);export{h as __pageData,g as default};

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assets/article_从0实现一个年度报告.md.DVnJ5X18.js → assets/article_从0实现一个年度报告.md.BGZ-Z7vx.js
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import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const y=JSON.parse('{"title":"从0实现一个年度报告","description":"","frontmatter":{},"headers":[],"relativePath":"article/从0实现一个年度报告.md","filePath":"article/从0实现一个年度报告.md","lastUpdated":1712924096000}'),l={name:"article/从0实现一个年度报告.md"},h=n(`<h1 id="从0实现一个年度报告" tabindex="-1">从0实现一个年度报告 <a class="header-anchor" href="#从0实现一个年度报告" aria-label="Permalink to &quot;从0实现一个年度报告&quot;">​</a></h1><p>每到年底各大应用都会推出自己的年终总结报告，统计出用户一年来在应用内的行为展示给用户，供用户记录、分享。</p><p>今年掘金社区推出了自己的<a href="https://zjsms.com/hbdA5jR" target="_blank" rel="noreferrer">2022掘友年度报告</a>，这次我们仿照这个报告，从0开始自己实现一个年终总结报告页面</p><h2 id="实现难点" tabindex="-1">实现难点 <a class="header-anchor" href="#实现难点" aria-label="Permalink to &quot;实现难点&quot;">​</a></h2><h3 id="_1-数据模拟" tabindex="-1">1. 数据模拟 <a class="header-anchor" href="#_1-数据模拟" aria-label="Permalink to &quot;1. 数据模拟&quot;">​</a></h3><p>一般情况下是根据用户UID，到后端去请求相关接口获得统计数据。</p><p>例如掘金的接口为<code>https://api.juejin.cn/event_api/v1/annual/annual_summary?aid=xxxxxx</code></p><p>本次后端使用<code>NodeJS</code>实现了一个爬虫，可以将用户数据统计完成后导出JSON格式的数据，将此数据粘贴到前端页面的输入框即可生成自己的报告</p><h3 id="_2-屏幕适配" tabindex="-1">2. 屏幕适配 <a class="header-anchor" href="#_2-屏幕适配" aria-label="Permalink to &quot;2. 屏幕适配&quot;">​</a></h3><p>可以观察到，在PC端和在手机端访问年度报告展示的效果是不一样的。</p><p>本次考虑使用媒体查询来实现这个功能：</p><ul><li>宽屏则展示背景，页面切换也使用背景中的上下切换按钮</li><li>小屏则隐藏背景，让内容填满屏幕，页面切换通过滑动事件监听</li></ul><h3 id="_3-动画效果" tabindex="-1">3. 动画效果 <a class="header-anchor" href="#_3-动画效果" aria-label="Permalink to &quot;3. 动画效果&quot;">​</a></h3><p>动画分为文本与背景元素的动画</p><ul><li>背景元素的动画使用了SVG动画 <ul><li>动画中不动的部分直接使用<code>.png</code>图片</li><li>运动的部分使用SVG动画绘制，如克里克的眼睛、尾巴</li></ul></li><li>文本的动画使用了<code>CSS Animation</code>渐显的效果 <ul><li>不同段落之间通过<code>animation-delay</code>属性，彼此相差<code>1000ms</code></li></ul></li></ul><p>背景动画容器的四个位置：<code>左上角</code> <code>右下角</code> <code>中间部分</code> <code>中间（悬浮气泡）</code>。不同位置的动画容器都采用绝对定位<code>position: absolute;</code>，辅以<code>z-index</code>实现层叠</p><p>囿于工期，本次的背景动画直接采用静态图片+<code>CSS Animation</code>实现上下浮动的效果</p><h3 id="_4-音乐播放" tabindex="-1">4. 音乐播放 <a class="header-anchor" href="#_4-音乐播放" aria-label="Permalink to &quot;4. 音乐播放&quot;">​</a></h3><p>通过<code>Audio</code>接口访问网络音乐链接，控制音乐相关功能</p><ul><li>进入页面开始播放</li><li>离开页面暂停播放</li><li>支持点击按钮切换播放状态</li></ul><h2 id="用户数据" tabindex="-1">用户数据 <a class="header-anchor" href="#用户数据" aria-label="Permalink to &quot;用户数据&quot;">​</a></h2><h3 id="用户数据内容" tabindex="-1">用户数据内容 <a class="header-anchor" href="#用户数据内容" aria-label="Permalink to &quot;用户数据内容&quot;">​</a></h3><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span>- 用户名</span></span> import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const y=JSON.parse('{"title":"从0实现一个年度报告","description":"","frontmatter":{},"headers":[],"relativePath":"article/从0实现一个年度报告.md","filePath":"article/从0实现一个年度报告.md","lastUpdated":1713715656000}'),l={name:"article/从0实现一个年度报告.md"},h=n(`<h1 id="从0实现一个年度报告" tabindex="-1">从0实现一个年度报告 <a class="header-anchor" href="#从0实现一个年度报告" aria-label="Permalink to &quot;从0实现一个年度报告&quot;">​</a></h1><p>每到年底各大应用都会推出自己的年终总结报告，统计出用户一年来在应用内的行为展示给用户，供用户记录、分享。</p><p>今年掘金社区推出了自己的<a href="https://zjsms.com/hbdA5jR" target="_blank" rel="noreferrer">2022掘友年度报告</a>，这次我们仿照这个报告，从0开始自己实现一个年终总结报告页面</p><h2 id="实现难点" tabindex="-1">实现难点 <a class="header-anchor" href="#实现难点" aria-label="Permalink to &quot;实现难点&quot;">​</a></h2><h3 id="_1-数据模拟" tabindex="-1">1. 数据模拟 <a class="header-anchor" href="#_1-数据模拟" aria-label="Permalink to &quot;1. 数据模拟&quot;">​</a></h3><p>一般情况下是根据用户UID，到后端去请求相关接口获得统计数据。</p><p>例如掘金的接口为<code>https://api.juejin.cn/event_api/v1/annual/annual_summary?aid=xxxxxx</code></p><p>本次后端使用<code>NodeJS</code>实现了一个爬虫，可以将用户数据统计完成后导出JSON格式的数据，将此数据粘贴到前端页面的输入框即可生成自己的报告</p><h3 id="_2-屏幕适配" tabindex="-1">2. 屏幕适配 <a class="header-anchor" href="#_2-屏幕适配" aria-label="Permalink to &quot;2. 屏幕适配&quot;">​</a></h3><p>可以观察到，在PC端和在手机端访问年度报告展示的效果是不一样的。</p><p>本次考虑使用媒体查询来实现这个功能：</p><ul><li>宽屏则展示背景，页面切换也使用背景中的上下切换按钮</li><li>小屏则隐藏背景，让内容填满屏幕，页面切换通过滑动事件监听</li></ul><h3 id="_3-动画效果" tabindex="-1">3. 动画效果 <a class="header-anchor" href="#_3-动画效果" aria-label="Permalink to &quot;3. 动画效果&quot;">​</a></h3><p>动画分为文本与背景元素的动画</p><ul><li>背景元素的动画使用了SVG动画 <ul><li>动画中不动的部分直接使用<code>.png</code>图片</li><li>运动的部分使用SVG动画绘制，如克里克的眼睛、尾巴</li></ul></li><li>文本的动画使用了<code>CSS Animation</code>渐显的效果 <ul><li>不同段落之间通过<code>animation-delay</code>属性，彼此相差<code>1000ms</code></li></ul></li></ul><p>背景动画容器的四个位置：<code>左上角</code> <code>右下角</code> <code>中间部分</code> <code>中间（悬浮气泡）</code>。不同位置的动画容器都采用绝对定位<code>position: absolute;</code>，辅以<code>z-index</code>实现层叠</p><p>囿于工期，本次的背景动画直接采用静态图片+<code>CSS Animation</code>实现上下浮动的效果</p><h3 id="_4-音乐播放" tabindex="-1">4. 音乐播放 <a class="header-anchor" href="#_4-音乐播放" aria-label="Permalink to &quot;4. 音乐播放&quot;">​</a></h3><p>通过<code>Audio</code>接口访问网络音乐链接，控制音乐相关功能</p><ul><li>进入页面开始播放</li><li>离开页面暂停播放</li><li>支持点击按钮切换播放状态</li></ul><h2 id="用户数据" tabindex="-1">用户数据 <a class="header-anchor" href="#用户数据" aria-label="Permalink to &quot;用户数据&quot;">​</a></h2><h3 id="用户数据内容" tabindex="-1">用户数据内容 <a class="header-anchor" href="#用户数据内容" aria-label="Permalink to &quot;用户数据内容&quot;">​</a></h3><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span>- 用户名</span></span>
<span class="line"><span>- 注册时间 距今天数</span></span> <span class="line"><span>- 注册时间 距今天数</span></span>
<span class="line"><span>- 创作相关</span></span> <span class="line"><span>- 创作相关</span></span>
<span class="line"><span> - 发布文章数</span></span> <span class="line"><span> - 发布文章数</span></span>

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import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const y=JSON.parse('{"title":"从0实现一个年度报告","description":"","frontmatter":{},"headers":[],"relativePath":"article/从0实现一个年度报告.md","filePath":"article/从0实现一个年度报告.md","lastUpdated":1712924096000}'),l={name:"article/从0实现一个年度报告.md"},h=n("",59),p=[h];function t(k,e,E,r,d,g){return a(),i("div",null,p)}const F=s(l,[["render",t]]);export{y as __pageData,F as default}; import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const y=JSON.parse('{"title":"从0实现一个年度报告","description":"","frontmatter":{},"headers":[],"relativePath":"article/从0实现一个年度报告.md","filePath":"article/从0实现一个年度报告.md","lastUpdated":1713715656000}'),l={name:"article/从0实现一个年度报告.md"},h=n("",59),p=[h];function t(k,e,E,r,d,g){return a(),i("div",null,p)}const F=s(l,[["render",t]]);export{y as __pageData,F as default};

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import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const o=JSON.parse('{"title":"彻底搞懂对象的数据属性描述符、存储属性描述符","description":"","frontmatter":{},"headers":[],"relativePath":"article/彻底搞懂对象的数据属性描述符、存储属性描述符.md","filePath":"article/彻底搞懂对象的数据属性描述符、存储属性描述符.md","lastUpdated":1712924096000}'),l={name:"article/彻底搞懂对象的数据属性描述符、存储属性描述符.md"},e=n(`<h1 id="彻底搞懂对象的数据属性描述符、存储属性描述符" tabindex="-1">彻底搞懂对象的数据属性描述符、存储属性描述符 <a class="header-anchor" href="#彻底搞懂对象的数据属性描述符、存储属性描述符" aria-label="Permalink to &quot;彻底搞懂对象的数据属性描述符、存储属性描述符&quot;">​</a></h1><h2 id="属性描述符" tabindex="-1">属性描述符 <a class="header-anchor" href="#属性描述符" aria-label="Permalink to &quot;属性描述符&quot;">​</a></h2><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> let</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> obj </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span> import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const o=JSON.parse('{"title":"彻底搞懂对象的数据属性描述符、存储属性描述符","description":"","frontmatter":{},"headers":[],"relativePath":"article/彻底搞懂对象的数据属性描述符、存储属性描述符.md","filePath":"article/彻底搞懂对象的数据属性描述符、存储属性描述符.md","lastUpdated":1713715656000}'),l={name:"article/彻底搞懂对象的数据属性描述符、存储属性描述符.md"},e=n(`<h1 id="彻底搞懂对象的数据属性描述符、存储属性描述符" tabindex="-1">彻底搞懂对象的数据属性描述符、存储属性描述符 <a class="header-anchor" href="#彻底搞懂对象的数据属性描述符、存储属性描述符" aria-label="Permalink to &quot;彻底搞懂对象的数据属性描述符、存储属性描述符&quot;">​</a></h1><h2 id="属性描述符" tabindex="-1">属性描述符 <a class="header-anchor" href="#属性描述符" aria-label="Permalink to &quot;属性描述符&quot;">​</a></h2><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> let</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> obj </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> name: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;ziu&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">,</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> name: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;ziu&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">,</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> age: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">18</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> age: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">18</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>

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import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const o=JSON.parse('{"title":"彻底搞懂对象的数据属性描述符、存储属性描述符","description":"","frontmatter":{},"headers":[],"relativePath":"article/彻底搞懂对象的数据属性描述符、存储属性描述符.md","filePath":"article/彻底搞懂对象的数据属性描述符、存储属性描述符.md","lastUpdated":1712924096000}'),l={name:"article/彻底搞懂对象的数据属性描述符、存储属性描述符.md"},e=n("",18),p=[e];function h(t,k,r,E,d,c){return a(),i("div",null,p)}const b=s(l,[["render",h]]);export{o as __pageData,b as default}; import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const o=JSON.parse('{"title":"彻底搞懂对象的数据属性描述符、存储属性描述符","description":"","frontmatter":{},"headers":[],"relativePath":"article/彻底搞懂对象的数据属性描述符、存储属性描述符.md","filePath":"article/彻底搞懂对象的数据属性描述符、存储属性描述符.md","lastUpdated":1713715656000}'),l={name:"article/彻底搞懂对象的数据属性描述符、存储属性描述符.md"},e=n("",18),p=[e];function h(t,k,r,E,d,c){return a(),i("div",null,p)}const b=s(l,[["render",h]]);export{o as __pageData,b as default};

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assets/article_浅析defineProperty与Proxy实现的双向绑定.md.Bujr_I3t.js → assets/article_浅析defineProperty与Proxy实现的双向绑定.md.DlyX7AIU.js
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import{_ as s,c as i,o as a,ai as e}from"./chunks/framework.BFSS5Pox.js";const g=JSON.parse('{"title":"浅析defineProperty与Proxy实现的双向绑定","description":"","frontmatter":{},"headers":[],"relativePath":"article/浅析defineProperty与Proxy实现的双向绑定.md","filePath":"article/浅析defineProperty与Proxy实现的双向绑定.md","lastUpdated":1712924096000}'),n={name:"article/浅析defineProperty与Proxy实现的双向绑定.md"},t=e(`<h1 id="浅析defineproperty与proxy实现的双向绑定" tabindex="-1">浅析defineProperty与Proxy实现的双向绑定 <a class="header-anchor" href="#浅析defineproperty与proxy实现的双向绑定" aria-label="Permalink to &quot;浅析defineProperty与Proxy实现的双向绑定&quot;">​</a></h1><blockquote><p>文章内容总结自Vue官网 <a href="https://cn.vuejs.org/v2/guide/reactivity.html#%E5%A6%82%E4%BD%95%E8%BF%BD%E8%B8%AA%E5%8F%98%E5%8C%96" target="_blank" rel="noreferrer">深入响应式原理</a></p></blockquote><h2 id="🔰-vue2的响应式原理" tabindex="-1">🔰 Vue2的响应式原理 <a class="header-anchor" href="#🔰-vue2的响应式原理" aria-label="Permalink to &quot;🔰 Vue2的响应式原理&quot;">​</a></h2><p><img src="https://v2.cn.vuejs.org/images/data.png" alt="image.png" loading="lazy"></p><blockquote><p>当你把一个普通的 JavaScript 对象传入 Vue 实例作为 <code>data</code> 选项，Vue 将遍历此对象所有的 property，并使用 <a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty" target="_blank" rel="noreferrer"><code>Object.defineProperty</code></a> 把这些 property 全部转为 <a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Guide/Working_with_Objects#%E5%AE%9A%E4%B9%89_getters_%E4%B8%8E_setters" target="_blank" rel="noreferrer">getter/setter</a>。</p><p>每个组件实例都对应一个 <strong>watcher</strong> 实例，它会在组件渲染的过程中把“接触”过的数据 property 记录为依赖。之后当依赖项的 setter 触发时，会通知 watcher，从而使它关联的组件重新渲染。</p></blockquote><p>Vue2的响应式原理，利用的是 <code>Object.defineProperty()</code> 的 <code>setter</code> 属性：</p><p><code>defineProperty()</code> 方法用于<strong>精确</strong>定义一个对象的属性，能够指定属性的各种特征，其中的 <code>set</code> 属性能够为对象指定一个 <code>setter</code> 函数，每次该属性的值发生修改，就会调用此函数。</p><blockquote><p>更多可以配置的属性请参看：<a href="https://juejin.cn/post/7088335075061792782" target="_blank" rel="noreferrer">什么是对象的数据属性描述符？存储属性描述符？</a></p></blockquote><p>这也是Vue2实现响应式数据、数据双向绑定的原理。</p><p>可以使用此方法实现一个简单的数据双向绑定的Demo：</p><p><img src="https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/f241135dbeb04e829fe6897c2e418aa2~tplv-k3u1fbpfcp-watermark.image?" alt="image.png" loading="lazy"></p><ul><li>输入框内的内容改变，<code>.vBox</code> 展示的文本会随之改变。</li><li>点击按钮修改 <code>vm.text</code>，输入框内的值和 <code>.vBox</code> 的文本都会发生改变。</li></ul><div class="language-html vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">html</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">body</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span> import{_ as s,c as i,o as a,ai as e}from"./chunks/framework.DKE0jNKv.js";const g=JSON.parse('{"title":"浅析defineProperty与Proxy实现的双向绑定","description":"","frontmatter":{},"headers":[],"relativePath":"article/浅析defineProperty与Proxy实现的双向绑定.md","filePath":"article/浅析defineProperty与Proxy实现的双向绑定.md","lastUpdated":1713715656000}'),n={name:"article/浅析defineProperty与Proxy实现的双向绑定.md"},t=e(`<h1 id="浅析defineproperty与proxy实现的双向绑定" tabindex="-1">浅析defineProperty与Proxy实现的双向绑定 <a class="header-anchor" href="#浅析defineproperty与proxy实现的双向绑定" aria-label="Permalink to &quot;浅析defineProperty与Proxy实现的双向绑定&quot;">​</a></h1><blockquote><p>文章内容总结自Vue官网 <a href="https://cn.vuejs.org/v2/guide/reactivity.html#%E5%A6%82%E4%BD%95%E8%BF%BD%E8%B8%AA%E5%8F%98%E5%8C%96" target="_blank" rel="noreferrer">深入响应式原理</a></p></blockquote><h2 id="🔰-vue2的响应式原理" tabindex="-1">🔰 Vue2的响应式原理 <a class="header-anchor" href="#🔰-vue2的响应式原理" aria-label="Permalink to &quot;🔰 Vue2的响应式原理&quot;">​</a></h2><p><img src="https://v2.cn.vuejs.org/images/data.png" alt="image.png" loading="lazy"></p><blockquote><p>当你把一个普通的 JavaScript 对象传入 Vue 实例作为 <code>data</code> 选项，Vue 将遍历此对象所有的 property，并使用 <a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Reference/Global_Objects/Object/defineProperty" target="_blank" rel="noreferrer"><code>Object.defineProperty</code></a> 把这些 property 全部转为 <a href="https://developer.mozilla.org/zh-CN/docs/Web/JavaScript/Guide/Working_with_Objects#%E5%AE%9A%E4%B9%89_getters_%E4%B8%8E_setters" target="_blank" rel="noreferrer">getter/setter</a>。</p><p>每个组件实例都对应一个 <strong>watcher</strong> 实例，它会在组件渲染的过程中把“接触”过的数据 property 记录为依赖。之后当依赖项的 setter 触发时，会通知 watcher，从而使它关联的组件重新渲染。</p></blockquote><p>Vue2的响应式原理，利用的是 <code>Object.defineProperty()</code> 的 <code>setter</code> 属性：</p><p><code>defineProperty()</code> 方法用于<strong>精确</strong>定义一个对象的属性，能够指定属性的各种特征，其中的 <code>set</code> 属性能够为对象指定一个 <code>setter</code> 函数，每次该属性的值发生修改，就会调用此函数。</p><blockquote><p>更多可以配置的属性请参看：<a href="https://juejin.cn/post/7088335075061792782" target="_blank" rel="noreferrer">什么是对象的数据属性描述符？存储属性描述符？</a></p></blockquote><p>这也是Vue2实现响应式数据、数据双向绑定的原理。</p><p>可以使用此方法实现一个简单的数据双向绑定的Demo：</p><p><img src="https://p9-juejin.byteimg.com/tos-cn-i-k3u1fbpfcp/f241135dbeb04e829fe6897c2e418aa2~tplv-k3u1fbpfcp-watermark.image?" alt="image.png" loading="lazy"></p><ul><li>输入框内的内容改变，<code>.vBox</code> 展示的文本会随之改变。</li><li>点击按钮修改 <code>vm.text</code>，输入框内的值和 <code>.vBox</code> 的文本都会发生改变。</li></ul><div class="language-html vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">html</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">body</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">input</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> type</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;text&quot;</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> id</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;input&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> /&gt;</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">input</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> type</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;text&quot;</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> id</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;input&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> /&gt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">button</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> onclick</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">vm</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">.</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">text</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;Hello, World.&#39;&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;Modify vm.text&lt;/</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">button</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">button</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> onclick</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">vm</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">.</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">text</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;Hello, World.&#39;&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;Modify vm.text&lt;/</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">button</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">div</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> class</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;vBox&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;&lt;/</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">div</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> class</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">=</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&quot;vBox&quot;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;&lt;/</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span>

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import{_ as s,c as i,o as a,ai as e}from"./chunks/framework.BFSS5Pox.js";const g=JSON.parse('{"title":"浅析defineProperty与Proxy实现的双向绑定","description":"","frontmatter":{},"headers":[],"relativePath":"article/浅析defineProperty与Proxy实现的双向绑定.md","filePath":"article/浅析defineProperty与Proxy实现的双向绑定.md","lastUpdated":1712924096000}'),n={name:"article/浅析defineProperty与Proxy实现的双向绑定.md"},t=e("",20),p=[t];function l(h,r,k,E,d,o){return a(),i("div",null,p)}const y=s(n,[["render",l]]);export{g as __pageData,y as default}; import{_ as s,c as i,o as a,ai as e}from"./chunks/framework.DKE0jNKv.js";const g=JSON.parse('{"title":"浅析defineProperty与Proxy实现的双向绑定","description":"","frontmatter":{},"headers":[],"relativePath":"article/浅析defineProperty与Proxy实现的双向绑定.md","filePath":"article/浅析defineProperty与Proxy实现的双向绑定.md","lastUpdated":1713715656000}'),n={name:"article/浅析defineProperty与Proxy实现的双向绑定.md"},t=e("",20),p=[t];function l(h,r,k,E,d,o){return a(),i("div",null,p)}const y=s(n,[["render",l]]);export{g as __pageData,y as default};

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import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const t="/assets/Object.prototype.toString.CjFLIGI9.png",y=JSON.parse('{"title":"","description":"","frontmatter":{},"headers":[],"relativePath":"article/深入JavaScript数据类型.md","filePath":"article/深入JavaScript数据类型.md","lastUpdated":1712924096000}'),l={name:"article/深入JavaScript数据类型.md"},e=n(`<h2 id="深入javascript数据类型" tabindex="-1">深入JavaScript数据类型 <a class="header-anchor" href="#深入javascript数据类型" aria-label="Permalink to &quot;深入JavaScript数据类型&quot;">​</a></h2><p>JavaScript包含以下几种数据类型：</p><ul><li>Number 数字</li><li>String 字符串</li><li>Boolean 布尔值</li><li>Symbol 符号 （ES6新增）</li><li>Object 对象 <ul><li>Function 函数</li><li>Array 数组</li><li>Date 日期</li><li>RegExp 正则表达式</li><li>...</li></ul></li><li>null 空</li><li>undefined 未定义</li></ul><p>从语言底层值的可变与不可变，可以将JS中的数据分为两种：不可变值（原始类型）和可变值（引用类型）</p><p>除了Object及继承自Object的特殊对象，其他的类型都为<strong>原始类型</strong>。</p><h2 id="typeof运算符" tabindex="-1">typeof运算符 <a class="header-anchor" href="#typeof运算符" aria-label="Permalink to &quot;typeof运算符&quot;">​</a></h2><p>除了null，所有<strong>原始类型</strong>都可以通过<code>typeof</code>运算符得到不同的结果</p><p>而null与object通过<code>typeof</code>运算符得到的结果都为<code>&#39;object&#39;</code></p><div class="language-javascript vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// 除了 null 其他原始类型的变量都可以通过 typeof 得到其类型</span></span> import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const t="/assets/Object.prototype.toString.CjFLIGI9.png",y=JSON.parse('{"title":"","description":"","frontmatter":{},"headers":[],"relativePath":"article/深入JavaScript数据类型.md","filePath":"article/深入JavaScript数据类型.md","lastUpdated":1713715656000}'),l={name:"article/深入JavaScript数据类型.md"},e=n(`<h2 id="深入javascript数据类型" tabindex="-1">深入JavaScript数据类型 <a class="header-anchor" href="#深入javascript数据类型" aria-label="Permalink to &quot;深入JavaScript数据类型&quot;">​</a></h2><p>JavaScript包含以下几种数据类型：</p><ul><li>Number 数字</li><li>String 字符串</li><li>Boolean 布尔值</li><li>Symbol 符号 （ES6新增）</li><li>Object 对象 <ul><li>Function 函数</li><li>Array 数组</li><li>Date 日期</li><li>RegExp 正则表达式</li><li>...</li></ul></li><li>null 空</li><li>undefined 未定义</li></ul><p>从语言底层值的可变与不可变，可以将JS中的数据分为两种：不可变值（原始类型）和可变值（引用类型）</p><p>除了Object及继承自Object的特殊对象，其他的类型都为<strong>原始类型</strong>。</p><h2 id="typeof运算符" tabindex="-1">typeof运算符 <a class="header-anchor" href="#typeof运算符" aria-label="Permalink to &quot;typeof运算符&quot;">​</a></h2><p>除了null，所有<strong>原始类型</strong>都可以通过<code>typeof</code>运算符得到不同的结果</p><p>而null与object通过<code>typeof</code>运算符得到的结果都为<code>&#39;object&#39;</code></p><div class="language-javascript vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">javascript</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// 除了 null 其他原始类型的变量都可以通过 typeof 得到其类型</span></span>
<span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// 而 null 与 object 通过 typeof 运算得到的都是 &#39;object&#39;</span></span> <span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// 而 null 与 object 通过 typeof 运算得到的都是 &#39;object&#39;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> targets</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> [</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">18</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;Ziu&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">true</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">Symbol</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">), {}, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">null</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">undefined</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">]</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> targets</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> [</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">18</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;Ziu&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">true</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">Symbol</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">), {}, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">null</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">undefined</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">]</span></span>
<span class="line"></span> <span class="line"></span>

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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> CustomInput </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;@/component/CustomInput.vue&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> CustomInput </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;@/component/CustomInput.vue&#39;</span></span>
<span class="line"></span> <span class="line"></span>
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import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const c=JSON.parse('{"title":"深入理解Proxy与Reflect","description":"","frontmatter":{},"headers":[],"relativePath":"article/深入理解Proxy与Reflect.md","filePath":"article/深入理解Proxy与Reflect.md","lastUpdated":1712924096000}'),l={name:"article/深入理解Proxy与Reflect.md"},p=n(`<h1 id="深入理解proxy与reflect" tabindex="-1">深入理解Proxy与Reflect <a class="header-anchor" href="#深入理解proxy与reflect" aria-label="Permalink to &quot;深入理解Proxy与Reflect&quot;">​</a></h1><h3 id="监听对象的操作" tabindex="-1">监听对象的操作 <a class="header-anchor" href="#监听对象的操作" aria-label="Permalink to &quot;监听对象的操作&quot;">​</a></h3><p>可以使用Proxy对象将原对象包裹，此后的操作都对<code>proxy</code>进行，每次<code>get</code>与<code>set</code>被触发时都会自动执行相应代码</p><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> obj</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span> import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const c=JSON.parse('{"title":"深入理解Proxy与Reflect","description":"","frontmatter":{},"headers":[],"relativePath":"article/深入理解Proxy与Reflect.md","filePath":"article/深入理解Proxy与Reflect.md","lastUpdated":1713715656000}'),l={name:"article/深入理解Proxy与Reflect.md"},p=n(`<h1 id="深入理解proxy与reflect" tabindex="-1">深入理解Proxy与Reflect <a class="header-anchor" href="#深入理解proxy与reflect" aria-label="Permalink to &quot;深入理解Proxy与Reflect&quot;">​</a></h1><h3 id="监听对象的操作" tabindex="-1">监听对象的操作 <a class="header-anchor" href="#监听对象的操作" aria-label="Permalink to &quot;监听对象的操作&quot;">​</a></h3><p>可以使用Proxy对象将原对象包裹，此后的操作都对<code>proxy</code>进行，每次<code>get</code>与<code>set</code>被触发时都会自动执行相应代码</p><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> obj</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
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import{_ as l,c as a,m as s,a as e,ai as i,o as n}from"./chunks/framework.BFSS5Pox.js";const p="/assets/BFC-1.Bs9guDK8.jpg",t="/assets/BFC-2.exVcyt2Q.jpg",h="/assets/BFC-3.B5Ao7L7o.jpg",k="/assets/BFC-4.CuxslIO8.jpg",q=JSON.parse('{"title":"CSS基础","description":"","frontmatter":{"editLink":false},"headers":[],"relativePath":"note/CSS.md","filePath":"note/CSS.md","lastUpdated":1712924096000}'),d={name:"note/CSS.md"},r=i(`<h1 id="css基础" tabindex="-1">CSS基础 <a class="header-anchor" href="#css基础" aria-label="Permalink to &quot;CSS基础&quot;">​</a></h1><h2 id="书写css代码的方式" tabindex="-1">书写CSS代码的方式 <a class="header-anchor" href="#书写css代码的方式" aria-label="Permalink to &quot;书写CSS代码的方式&quot;">​</a></h2><p>CSS提供了三种方法，可以将CSS样式应用到元素上：</p><ul><li>内联样式 <ul><li>直接将样式写到元素的<code>style</code>属性上</li></ul></li><li>内部样式表 <ul><li>将样式通过<code>&lt;style&gt;</code>标签写在<code>&lt;head&gt;</code>标签中，通过选择器应用到元素上</li></ul></li><li>外部样式表 <ul><li>将样式写在外部文件如<code>style.css</code>中，再通过<code>&lt;link&gt;</code>标签引入</li></ul></li></ul><h2 id="文本样式-text" tabindex="-1">文本样式(text) <a class="header-anchor" href="#文本样式-text" aria-label="Permalink to &quot;文本样式(text)&quot;">​</a></h2><ul><li>text-decoration 框线样式 <ul><li>line-through 删除线</li><li>overline 上划线</li><li>underline 下划线</li><li>none 不设置装饰线</li></ul></li><li>text-transform <ul><li><code>text-transform</code> 属性指定如何将元素的文本大写。</li><li>它可以用于使文本显示为全大写或全小写，也可单独对每一个单词进行操作。</li></ul></li><li>text-indent <ul><li><code>text-indent</code> 属性能定义一个块元素首行文本内容之前的缩进量。</li></ul></li><li>text-align</li><li>word/letter-spacing</li></ul><h3 id="text-align-重要" tabindex="-1">text-align（重要） <a class="header-anchor" href="#text-align-重要" aria-label="Permalink to &quot;text-align（重要）&quot;">​</a></h3><p>行内内容（例如文字）如何相对它的块父元素对齐，<code>left</code>靠左 <code>center</code>居中 <code>right</code>靠右 <code>justify</code>两端对齐</p><p>默认值为<code>left</code></p><p>需要注意的是，当子元素是<code>div</code>时，对父元素设置<code>text-align</code>是不生效的：</p><div class="language-css vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">css</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">.box</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span> import{_ as l,c as a,l as s,a as e,ai as i,o as n}from"./chunks/framework.DKE0jNKv.js";const p="/assets/BFC-1.Bs9guDK8.jpg",t="/assets/BFC-2.exVcyt2Q.jpg",h="/assets/BFC-3.B5Ao7L7o.jpg",k="/assets/BFC-4.CuxslIO8.jpg",q=JSON.parse('{"title":"CSS基础","description":"","frontmatter":{"editLink":false},"headers":[],"relativePath":"note/CSS.md","filePath":"note/CSS.md","lastUpdated":1713715656000}'),d={name:"note/CSS.md"},r=i(`<h1 id="css基础" tabindex="-1">CSS基础 <a class="header-anchor" href="#css基础" aria-label="Permalink to &quot;CSS基础&quot;">​</a></h1><h2 id="书写css代码的方式" tabindex="-1">书写CSS代码的方式 <a class="header-anchor" href="#书写css代码的方式" aria-label="Permalink to &quot;书写CSS代码的方式&quot;">​</a></h2><p>CSS提供了三种方法，可以将CSS样式应用到元素上：</p><ul><li>内联样式 <ul><li>直接将样式写到元素的<code>style</code>属性上</li></ul></li><li>内部样式表 <ul><li>将样式通过<code>&lt;style&gt;</code>标签写在<code>&lt;head&gt;</code>标签中，通过选择器应用到元素上</li></ul></li><li>外部样式表 <ul><li>将样式写在外部文件如<code>style.css</code>中，再通过<code>&lt;link&gt;</code>标签引入</li></ul></li></ul><h2 id="文本样式-text" tabindex="-1">文本样式(text) <a class="header-anchor" href="#文本样式-text" aria-label="Permalink to &quot;文本样式(text)&quot;">​</a></h2><ul><li>text-decoration 框线样式 <ul><li>line-through 删除线</li><li>overline 上划线</li><li>underline 下划线</li><li>none 不设置装饰线</li></ul></li><li>text-transform <ul><li><code>text-transform</code> 属性指定如何将元素的文本大写。</li><li>它可以用于使文本显示为全大写或全小写，也可单独对每一个单词进行操作。</li></ul></li><li>text-indent <ul><li><code>text-indent</code> 属性能定义一个块元素首行文本内容之前的缩进量。</li></ul></li><li>text-align</li><li>word/letter-spacing</li></ul><h3 id="text-align-重要" tabindex="-1">text-align（重要） <a class="header-anchor" href="#text-align-重要" aria-label="Permalink to &quot;text-align（重要）&quot;">​</a></h3><p>行内内容（例如文字）如何相对它的块父元素对齐，<code>left</code>靠左 <code>center</code>居中 <code>right</code>靠右 <code>justify</code>两端对齐</p><p>默认值为<code>left</code></p><p>需要注意的是，当子元素是<code>div</code>时，对父元素设置<code>text-align</code>是不生效的：</p><div class="language-css vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">css</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">.box</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> height</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">500</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">px</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span> <span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> height</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">500</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">px</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> text-align</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">center</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span> <span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> text-align</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">center</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>
<span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> background-color</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">red</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span> <span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> background-color</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">red</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">;</span></span>

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import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const l="/assets/image-20221118222207332-16687813334481.voHhuUQb.png",p="/assets/image-20221118222311200-16687813941873.BNUI2Qna.png",h="/assets/image-20221122103111654.-tsvcGvv.png",e="/assets/image-20221122103256116.BasjQ_pg.png",k="/assets/image-20221122103715428.DMMNV3OF.png",t="/assets/image-20221125090752249.BnpI9zXc.png",r="/assets/image-20221125094148365.ZryUkl5L.png",B=JSON.parse('{"title":"JavaScript 高级教程","description":"","frontmatter":{"editLink":false},"headers":[],"relativePath":"note/JavaScriptEnhanced.md","filePath":"note/JavaScriptEnhanced.md","lastUpdated":1712924096000}'),E={name:"note/JavaScriptEnhanced.md"},d=n(`<h1 id="javascript-高级教程" tabindex="-1">JavaScript 高级教程 <a class="header-anchor" href="#javascript-高级教程" aria-label="Permalink to &quot;JavaScript 高级教程&quot;">​</a></h1><h2 id="函数中this指向" tabindex="-1">函数中this指向 <a class="header-anchor" href="#函数中this指向" aria-label="Permalink to &quot;函数中this指向&quot;">​</a></h2><p>函数在调用时, Javascript会默认为this绑定一个值</p><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// 定义一个函数</span></span> import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const l="/assets/image-20221118222207332-16687813334481.voHhuUQb.png",p="/assets/image-20221118222311200-16687813941873.BNUI2Qna.png",h="/assets/image-20221122103111654.-tsvcGvv.png",e="/assets/image-20221122103256116.BasjQ_pg.png",k="/assets/image-20221122103715428.DMMNV3OF.png",t="/assets/image-20221125090752249.BnpI9zXc.png",r="/assets/image-20221125094148365.ZryUkl5L.png",B=JSON.parse('{"title":"JavaScript 高级教程","description":"","frontmatter":{"editLink":false},"headers":[],"relativePath":"note/JavaScriptEnhanced.md","filePath":"note/JavaScriptEnhanced.md","lastUpdated":1713715656000}'),E={name:"note/JavaScriptEnhanced.md"},d=n(`<h1 id="javascript-高级教程" tabindex="-1">JavaScript 高级教程 <a class="header-anchor" href="#javascript-高级教程" aria-label="Permalink to &quot;JavaScript 高级教程&quot;">​</a></h1><h2 id="函数中this指向" tabindex="-1">函数中this指向 <a class="header-anchor" href="#函数中this指向" aria-label="Permalink to &quot;函数中this指向&quot;">​</a></h2><p>函数在调用时, Javascript会默认为this绑定一个值</p><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// 定义一个函数</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> foo</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() {</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> foo</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() {</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">this</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">this</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span>

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import{_ as s,c as i,o as a,ai as t}from"./chunks/framework.BFSS5Pox.js";const c=JSON.parse('{"title":"MySQL","description":"","frontmatter":{},"headers":[],"relativePath":"note/MySQL.md","filePath":"note/MySQL.md","lastUpdated":1712924096000}'),l={name:"note/MySQL.md"},n=t("",71),e=[n];function h(p,k,d,r,g,E){return a(),i("div",null,e)}const o=s(l,[["render",h]]);export{c as __pageData,o as default}; import{_ as s,c as i,o as a,ai as t}from"./chunks/framework.DKE0jNKv.js";const c=JSON.parse('{"title":"MySQL","description":"","frontmatter":{},"headers":[],"relativePath":"note/MySQL.md","filePath":"note/MySQL.md","lastUpdated":1713715656000}'),l={name:"note/MySQL.md"},n=t("",71),e=[n];function h(p,k,d,r,g,E){return a(),i("div",null,e)}const o=s(l,[["render",h]]);export{c as __pageData,o as default};

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@@ -1,4 +1,4 @@
import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const l="/assets/useLayoutEffect.B_End6k1.svg",p="/assets/SSR.Ja5pYx3h.svg",F=JSON.parse('{"title":"React Hooks","description":"","frontmatter":{},"headers":[],"relativePath":"note/React Hooks.md","filePath":"note/React Hooks.md","lastUpdated":1712924096000}'),h={name:"note/React Hooks.md"},k=n(`<h1 id="react-hooks" tabindex="-1">React Hooks <a class="header-anchor" href="#react-hooks" aria-label="Permalink to &quot;React Hooks&quot;">​</a></h1><ul><li>认识和体验Hooks</li><li>State/Effect</li><li>Context/Reducer</li><li>Callback/Memo</li><li>Ref/LayoutEffect</li><li>自定义Hooks使用</li></ul><h2 id="认识react-hooks" tabindex="-1">认识React Hooks <a class="header-anchor" href="#认识react-hooks" aria-label="Permalink to &quot;认识React Hooks&quot;">​</a></h2><p>Hooks 是 React16.8 推出的新特性</p><p>在没有Hooks时，类组件能够完成的大部分工作，函数式组件都无法胜任：</p><ul><li>类组件可以定义并保存组件内部状态，并在状态发生改变时触发视图重新渲染 <ul><li>函数式组件不行，每次调用函数其中的变量都会被重新初始化，重新渲染时整个函数都重新执行</li></ul></li><li>类组件可以在其内部的生命周期回调中添加副作用 <ul><li>例如<code>componentDidMount</code>在类组件生命周期只会执行一次</li><li>函数式组件没有生命周期，如果在函数体内发起网络请求，那每次重新渲染都会发起请求</li></ul></li></ul><p>类组件存在的问题：</p><ul><li>复杂组件变得难以理解 <ul><li>业务代码相互耦合，类组件变得复杂</li><li>逻辑强耦合在一起难以拆分，强行拆分会导致过度设计，进一步增加代码复杂度</li></ul></li><li>class关键字的理解 <ul><li>初学React时class关键字理解存在困难</li><li>处理<code>this</code>的指向问题需要花费额外的心智负担</li></ul></li><li>组件状态复用 <ul><li>要复用组件需要借助高阶组件</li><li><code>redux</code> 中的 <code>connect</code> 或者 <code>react-router</code> 中的 <code>withRouter</code>，高阶组件的目的就是为了状态复</li><li>或通过Provider、Consumer来共享状态，但是Comsumer嵌套问题较严重</li></ul></li></ul><p>Hooks带来的优势：</p><ul><li>在不编写class的情况下使用state和其他React特性（如生命周期）</li><li>Hooks 允许我们在函数式组件中使用状态，并在状态发生改变时让视图重新渲染</li><li>同时，我们还可以在函数式组件中使用生命周期回调</li><li>更多的优点 ...</li></ul><h2 id="计数器案例对比" tabindex="-1">计数器案例对比 <a class="header-anchor" href="#计数器案例对比" aria-label="Permalink to &quot;计数器案例对比&quot;">​</a></h2><p>分别使用Hooks和类组件编写一个计数器：</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-iSSDo" id="tab-0R4hnNt" checked="checked"><label for="tab-0R4hnNt">CounterClass.jsx</label><input type="radio" name="group-iSSDo" id="tab-QMpPyM9"><label for="tab-QMpPyM9">CounterFunctional.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// CounterClass.jsx</span></span> import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const l="/assets/useLayoutEffect.B_End6k1.svg",p="/assets/SSR.Ja5pYx3h.svg",F=JSON.parse('{"title":"React Hooks","description":"","frontmatter":{},"headers":[],"relativePath":"note/React Hooks.md","filePath":"note/React Hooks.md","lastUpdated":1713715656000}'),h={name:"note/React Hooks.md"},k=n(`<h1 id="react-hooks" tabindex="-1">React Hooks <a class="header-anchor" href="#react-hooks" aria-label="Permalink to &quot;React Hooks&quot;">​</a></h1><ul><li>认识和体验Hooks</li><li>State/Effect</li><li>Context/Reducer</li><li>Callback/Memo</li><li>Ref/LayoutEffect</li><li>自定义Hooks使用</li></ul><h2 id="认识react-hooks" tabindex="-1">认识React Hooks <a class="header-anchor" href="#认识react-hooks" aria-label="Permalink to &quot;认识React Hooks&quot;">​</a></h2><p>Hooks 是 React16.8 推出的新特性</p><p>在没有Hooks时，类组件能够完成的大部分工作，函数式组件都无法胜任：</p><ul><li>类组件可以定义并保存组件内部状态，并在状态发生改变时触发视图重新渲染 <ul><li>函数式组件不行，每次调用函数其中的变量都会被重新初始化，重新渲染时整个函数都重新执行</li></ul></li><li>类组件可以在其内部的生命周期回调中添加副作用 <ul><li>例如<code>componentDidMount</code>在类组件生命周期只会执行一次</li><li>函数式组件没有生命周期，如果在函数体内发起网络请求，那每次重新渲染都会发起请求</li></ul></li></ul><p>类组件存在的问题：</p><ul><li>复杂组件变得难以理解 <ul><li>业务代码相互耦合，类组件变得复杂</li><li>逻辑强耦合在一起难以拆分，强行拆分会导致过度设计，进一步增加代码复杂度</li></ul></li><li>class关键字的理解 <ul><li>初学React时class关键字理解存在困难</li><li>处理<code>this</code>的指向问题需要花费额外的心智负担</li></ul></li><li>组件状态复用 <ul><li>要复用组件需要借助高阶组件</li><li><code>redux</code> 中的 <code>connect</code> 或者 <code>react-router</code> 中的 <code>withRouter</code>，高阶组件的目的就是为了状态复</li><li>或通过Provider、Consumer来共享状态，但是Comsumer嵌套问题较严重</li></ul></li></ul><p>Hooks带来的优势：</p><ul><li>在不编写class的情况下使用state和其他React特性（如生命周期）</li><li>Hooks 允许我们在函数式组件中使用状态，并在状态发生改变时让视图重新渲染</li><li>同时，我们还可以在函数式组件中使用生命周期回调</li><li>更多的优点 ...</li></ul><h2 id="计数器案例对比" tabindex="-1">计数器案例对比 <a class="header-anchor" href="#计数器案例对比" aria-label="Permalink to &quot;计数器案例对比&quot;">​</a></h2><p>分别使用Hooks和类组件编写一个计数器：</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-kFhha" id="tab-hXR-r-0" checked="checked"><label for="tab-hXR-r-0">CounterClass.jsx</label><input type="radio" name="group-kFhha" id="tab-sm-Mjih"><label for="tab-sm-Mjih">CounterFunctional.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// CounterClass.jsx</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> React, { PureComponent } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> React, { PureComponent } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span>
<span class="line"></span> <span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> default</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> class</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> CounterClass</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> extends</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> PureComponent</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> default</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> class</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> CounterClass</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> extends</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> PureComponent</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
@@ -95,7 +95,7 @@ import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const l
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;Effect Cleaned Up&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">&#39;Effect Cleaned Up&#39;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
<span class="line highlighted"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }, [])</span></span> <span class="line highlighted"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }, [])</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">...</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><h2 id="usecontext" tabindex="-1">useContext <a class="header-anchor" href="#usecontext" aria-label="Permalink to &quot;useContext&quot;">​</a></h2><p>在之前的开发中，要在组件中使用共享的Context有两种方式</p><ul><li>类组件可以通过<code>ClassName.contextType = SomeContext</code>绑定上下文</li><li>在类的函数中通过<code>this.context.xxx</code>获取上下文中共享的状态</li><li>同时有多个Context时/函数式组件中，通过<code>SomeContext.Consumer</code>的方式共享上下文状态</li></ul><p>其中最大的问题就是：多个Context在同时使用时会引入大量的嵌套，而<code>useContext</code>可以帮我们解决这个问题</p><p>通过<code>useContext</code>可以直接获取到某个上下文中共享的状态变量</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-qq5NL" id="tab-sXc6Ipd" checked="checked"><label for="tab-sXc6Ipd">Profile.jsx</label><input type="radio" name="group-qq5NL" id="tab-lm-lRC7"><label for="tab-lm-lRC7">index.js</label><input type="radio" name="group-qq5NL" id="tab-3QFJpzP"><label for="tab-3QFJpzP">App.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// Profile.jsx</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">...</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><h2 id="usecontext" tabindex="-1">useContext <a class="header-anchor" href="#usecontext" aria-label="Permalink to &quot;useContext&quot;">​</a></h2><p>在之前的开发中，要在组件中使用共享的Context有两种方式</p><ul><li>类组件可以通过<code>ClassName.contextType = SomeContext</code>绑定上下文</li><li>在类的函数中通过<code>this.context.xxx</code>获取上下文中共享的状态</li><li>同时有多个Context时/函数式组件中，通过<code>SomeContext.Consumer</code>的方式共享上下文状态</li></ul><p>其中最大的问题就是：多个Context在同时使用时会引入大量的嵌套，而<code>useContext</code>可以帮我们解决这个问题</p><p>通过<code>useContext</code>可以直接获取到某个上下文中共享的状态变量</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-LjGs2" id="tab-x0YyD3f" checked="checked"><label for="tab-x0YyD3f">Profile.jsx</label><input type="radio" name="group-LjGs2" id="tab-bnWmeCw"><label for="tab-bnWmeCw">index.js</label><input type="radio" name="group-LjGs2" id="tab-5iA2bye"><label for="tab-5iA2bye">App.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// Profile.jsx</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> React, { useContext } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> React, { useContext } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { UserContext, ThemeContext } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;../context&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { UserContext, ThemeContext } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;../context&#39;</span></span>
<span class="line"></span> <span class="line"></span>
@@ -135,7 +135,7 @@ import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const l
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;/</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">UserContext.Provider</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;/</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">UserContext.Provider</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;/</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;/</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br></div></div></div></div><p>当组件上层最近的<code>SomeContext.Provider</code>提供的值发生更新时，<code>useContext</code>会使用上下文中最新的数据触发组件的重新渲染</p><h2 id="usereducer" tabindex="-1">useReducer <a class="header-anchor" href="#usereducer" aria-label="Permalink to &quot;useReducer&quot;">​</a></h2><p><code>useReducer</code>并不是Redux的替代品</p><ul><li><code>useReducer</code>是<code>useState</code>在某些场景下的替代方案</li><li>如果state需要处理的<strong>数据较为复杂</strong>，我们可以通过<code>useReducer</code>对其进行拆分</li><li>或者需要修改的state需要依赖之前的state时，也可以使用<code>useReducer</code></li></ul><p>下面举一个例子：用户信息包含多个复杂的字段，当用户执行操作后需要同时对多个字段进行修改</p><p>我们分别用<code>useState</code>和<code>useReducer</code>来实现：</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-Hylvh" id="tab-gs8pFnb" checked="checked"><label for="tab-gs8pFnb">UserInfoWithReducer.jsx</label><input type="radio" name="group-Hylvh" id="tab-GCHmYxW"><label for="tab-GCHmYxW">UserInfo.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// UserInfoWithReducer.jsx</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br></div></div></div></div><p>当组件上层最近的<code>SomeContext.Provider</code>提供的值发生更新时，<code>useContext</code>会使用上下文中最新的数据触发组件的重新渲染</p><h2 id="usereducer" tabindex="-1">useReducer <a class="header-anchor" href="#usereducer" aria-label="Permalink to &quot;useReducer&quot;">​</a></h2><p><code>useReducer</code>并不是Redux的替代品</p><ul><li><code>useReducer</code>是<code>useState</code>在某些场景下的替代方案</li><li>如果state需要处理的<strong>数据较为复杂</strong>，我们可以通过<code>useReducer</code>对其进行拆分</li><li>或者需要修改的state需要依赖之前的state时，也可以使用<code>useReducer</code></li></ul><p>下面举一个例子：用户信息包含多个复杂的字段，当用户执行操作后需要同时对多个字段进行修改</p><p>我们分别用<code>useState</code>和<code>useReducer</code>来实现：</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group--OkJ7" id="tab-MznlC-K" checked="checked"><label for="tab-MznlC-K">UserInfoWithReducer.jsx</label><input type="radio" name="group--OkJ7" id="tab-yHnx6FC"><label for="tab-yHnx6FC">UserInfo.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// UserInfoWithReducer.jsx</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> React, { useReducer } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> React, { useReducer } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span>
<span class="line"></span> <span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> reducer</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">state</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">action</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> reducer</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">state</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">action</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span>
@@ -278,7 +278,7 @@ import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const l
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> bar1</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> foo</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">()</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> bar1</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> foo</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">()</span></span>
<span class="line"></span> <span class="line"></span>
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">bar1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// 1</span></span> <span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">bar1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// 1</span></span>
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">bar1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// 1</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br></div></div><p>不论调用了多少次<code>bar1</code>，其内部取到的值都始终是最初的那个<code>count</code>，自然值也不会发生变化</p><p>所以，我们需要显式地为<code>useCallback</code>指定依赖state，这样才能准确地使用最新的状态定义新的函数</p><h3 id="真实的usecallback使用场景" tabindex="-1">真实的useCallback使用场景 <a class="header-anchor" href="#真实的usecallback使用场景" aria-label="Permalink to &quot;真实的useCallback使用场景&quot;">​</a></h3><p>经过之前的说明，目前<code>useCallback</code>看起来并没有实际的用途，它没有减少函数的定义次数，甚至在不合理使用时还会出现闭包陷阱，而带来的唯一好处就是：<strong>当状态没有发生改变时，保证函数指向确定且唯一</strong></p><p>下面我们举一个实际场景来说明<code>useCallback</code>的用途：</p><p>一个嵌套计数器的例子，外部计数器可以展示/改变计数器的值，子组件也可以通过调用props传递来的函数来改变计数器的值，同时外部计数器还包含了其他的状态在动态被修改</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-axZCX" id="tab-soNx4-L" checked="checked"><label for="tab-soNx4-L">InnerCounter.jsx</label><input type="radio" name="group-axZCX" id="tab-mjELzeA"><label for="tab-mjELzeA">Counter.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// InnerCounter.jsx</span></span> <span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">bar1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// 1</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br></div></div><p>不论调用了多少次<code>bar1</code>，其内部取到的值都始终是最初的那个<code>count</code>，自然值也不会发生变化</p><p>所以，我们需要显式地为<code>useCallback</code>指定依赖state，这样才能准确地使用最新的状态定义新的函数</p><h3 id="真实的usecallback使用场景" tabindex="-1">真实的useCallback使用场景 <a class="header-anchor" href="#真实的usecallback使用场景" aria-label="Permalink to &quot;真实的useCallback使用场景&quot;">​</a></h3><p>经过之前的说明，目前<code>useCallback</code>看起来并没有实际的用途，它没有减少函数的定义次数，甚至在不合理使用时还会出现闭包陷阱，而带来的唯一好处就是：<strong>当状态没有发生改变时，保证函数指向确定且唯一</strong></p><p>下面我们举一个实际场景来说明<code>useCallback</code>的用途：</p><p>一个嵌套计数器的例子，外部计数器可以展示/改变计数器的值，子组件也可以通过调用props传递来的函数来改变计数器的值，同时外部计数器还包含了其他的状态在动态被修改</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-950ZC" id="tab-y_kEbzd" checked="checked"><label for="tab-y_kEbzd">InnerCounter.jsx</label><input type="radio" name="group-950ZC" id="tab-n45T49x"><label for="tab-n45T49x">Counter.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// InnerCounter.jsx</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> React, { memo } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> React, { memo } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span>
<span class="line"></span> <span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> default</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> memo</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> InnerCounter</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">props</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> default</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> memo</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> InnerCounter</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">props</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span>
@@ -526,7 +526,7 @@ import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const l
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> theme</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> useContext</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(ThemeContext)</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> theme</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> useContext</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(ThemeContext)</span></span>
<span class="line"></span> <span class="line"></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(user.name, theme.primaryColor) </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// ...</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(user.name, theme.primaryColor) </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// ...</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">...</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>我们可以使用自定义Hook来简化这一操作，将所有的Context统一导入并转化为对象，直接在组件中使用</p><p>对之前的Profile组件使用Hook进行增强：</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-QRxIG" id="tab-_JOo44H" checked="checked"><label for="tab-_JOo44H">useSharedContext.js</label><input type="radio" name="group-QRxIG" id="tab-2idRMMx"><label for="tab-2idRMMx">Profile.js</label></div><div class="blocks"><div class="language-ts vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// useSharedContext.js</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">...</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br></div></div><p>我们可以使用自定义Hook来简化这一操作，将所有的Context统一导入并转化为对象，直接在组件中使用</p><p>对之前的Profile组件使用Hook进行增强：</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-gJy7b" id="tab-2FY1e6J" checked="checked"><label for="tab-2FY1e6J">useSharedContext.js</label><input type="radio" name="group-gJy7b" id="tab-xpfNRQQ"><label for="tab-xpfNRQQ">Profile.js</label></div><div class="blocks"><div class="language-ts vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// useSharedContext.js</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { useContext } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { useContext } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { UserContext, ThemeContext } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;../context&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { UserContext, ThemeContext } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;../context&#39;</span></span>
<span class="line"></span> <span class="line"></span>
@@ -550,7 +550,7 @@ import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const l
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">theme</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">context</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">theme</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">.</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">theme</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}&lt;/</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">theme</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">:</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">context</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">theme</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">.</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">theme</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}&lt;/</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> &lt;/</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">div</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">&gt;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> &lt;/</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">div</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">&gt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br></div></div></div></div><h3 id="案例二-获取滚动位置" tabindex="-1">案例二：获取滚动位置 <a class="header-anchor" href="#案例二-获取滚动位置" aria-label="Permalink to &quot;案例二：获取滚动位置&quot;">​</a></h3><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-4UPpR" id="tab-vs4t_0Q" checked="checked"><label for="tab-vs4t_0Q">useScrollPosition.js</label><input type="radio" name="group-4UPpR" id="tab-qWK3uI2"><label for="tab-qWK3uI2">GiantList.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// useScrollPosition.js</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br></div></div></div></div><h3 id="案例二-获取滚动位置" tabindex="-1">案例二：获取滚动位置 <a class="header-anchor" href="#案例二-获取滚动位置" aria-label="Permalink to &quot;案例二：获取滚动位置&quot;">​</a></h3><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-dcSJ2" id="tab-gFhUldf" checked="checked"><label for="tab-gFhUldf">useScrollPosition.js</label><input type="radio" name="group-dcSJ2" id="tab-Cply0MZ"><label for="tab-Cply0MZ">GiantList.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// useScrollPosition.js</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { useState, useEffect } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { useState, useEffect } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span>
<span class="line"></span> <span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> useScrollPosition</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">options</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {}) {</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> useScrollPosition</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">options</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {}) {</span></span>
@@ -587,7 +587,7 @@ import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const l
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">})</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">})</span></span>
<span class="line"></span> <span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> default</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> GiantList</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br></div></div></div></div><h3 id="案例三-封装localstorage" tabindex="-1">案例三：封装localStorage <a class="header-anchor" href="#案例三-封装localstorage" aria-label="Permalink to &quot;案例三：封装localStorage&quot;">​</a></h3><p>在使用状态变量的时候，为状态变量值的更新添加副作用，将变量名作为key，值更新到localStorage中</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-i1fQJ" id="tab-gCPdaOX" checked="checked"><label for="tab-gCPdaOX">useLocalStorage.js</label><input type="radio" name="group-i1fQJ" id="tab-T7anx0y"><label for="tab-T7anx0y">UserInfoStorage.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// useLocalStorage.js</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> default</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> GiantList</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br></div></div></div></div><h3 id="案例三-封装localstorage" tabindex="-1">案例三：封装localStorage <a class="header-anchor" href="#案例三-封装localstorage" aria-label="Permalink to &quot;案例三：封装localStorage&quot;">​</a></h3><p>在使用状态变量的时候，为状态变量值的更新添加副作用，将变量名作为key，值更新到localStorage中</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-i5sKZ" id="tab-y4zYrBe" checked="checked"><label for="tab-y4zYrBe">useLocalStorage.js</label><input type="radio" name="group-i5sKZ" id="tab-g3FeDrF"><label for="tab-g3FeDrF">UserInfoStorage.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// useLocalStorage.js</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { useState, useEffect } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { useState, useEffect } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span>
<span class="line"></span> <span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> useLocalStorage</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">key</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> useLocalStorage</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">key</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span>
@@ -622,7 +622,7 @@ import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const l
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">})</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">})</span></span>
<span class="line"></span> <span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> default</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> UserInfoStorage</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br></div></div></div></div><p>这里的<code>useState</code>还展示了一个额外的用法，向<code>useState</code>传递一个函数，函数的返回值会作为状态变量的初始值</p><h2 id="redux-hooks" tabindex="-1">Redux Hooks <a class="header-anchor" href="#redux-hooks" aria-label="Permalink to &quot;Redux Hooks&quot;">​</a></h2><p>之前的Redux开发中，为了让组件和Redux建立联系，我们使用了react-redux中的connect</p><ul><li>必须与高阶函数结合，必须使用返回的高阶组件</li><li>必须编写<code>mapStateToProps</code> <code>mapDispatchToProps</code>，将上下文状态映射到props中</li></ul><p>从Redux7.1开始，支持Hook写法，不再需要编写connect以及映射函数了</p><h3 id="useselector" tabindex="-1">useSelector <a class="header-anchor" href="#useselector" aria-label="Permalink to &quot;useSelector&quot;">​</a></h3><p>将state映射到组件中</p><ul><li>参数一：将state映射到需要的数据中</li><li>参数二：可以进行比较，来决定组件是否重新渲染</li></ul><p>默认情况下<code>useSelector</code>监听整个state的变化，只要state中有状态变量发生变化，无论当前组件是否使用到了这个状态变量，都会触发组件的重新渲染。这就需要我们显式地为其指定重新渲染的判断条件</p><blockquote><p><code>useSelector</code>会比较我们返回的两个对象是否相等：</p><div class="language-ts vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> refEquality</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">a</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">b</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">===</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> b);</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><p>只有两个对象全等时，才可以不触发重新渲染</p></blockquote><h3 id="usedispatch" tabindex="-1">useDispatch <a class="header-anchor" href="#usedispatch" aria-label="Permalink to &quot;useDispatch&quot;">​</a></h3><p>直接获取<code>dispatch</code>函数，之后在组件中直接调用即可</p><p>另外，我们还可以通过<code>useStore</code>来获取当前的store对象</p><p>拿之前Redux的计数器举例，使用<code>useSelector</code>与<code>useDispatch</code>进行重构：</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-Ux1jP" id="tab-1WTCW0r" checked="checked"><label for="tab-1WTCW0r">[Now] Counter.jsx</label><input type="radio" name="group-Ux1jP" id="tab-Fy--SQN"><label for="tab-Fy--SQN">[Prev] Counter.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// [Now] Counter.jsx</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> default</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> UserInfoStorage</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br></div></div></div></div><p>这里的<code>useState</code>还展示了一个额外的用法，向<code>useState</code>传递一个函数，函数的返回值会作为状态变量的初始值</p><h2 id="redux-hooks" tabindex="-1">Redux Hooks <a class="header-anchor" href="#redux-hooks" aria-label="Permalink to &quot;Redux Hooks&quot;">​</a></h2><p>之前的Redux开发中，为了让组件和Redux建立联系，我们使用了react-redux中的connect</p><ul><li>必须与高阶函数结合，必须使用返回的高阶组件</li><li>必须编写<code>mapStateToProps</code> <code>mapDispatchToProps</code>，将上下文状态映射到props中</li></ul><p>从Redux7.1开始，支持Hook写法，不再需要编写connect以及映射函数了</p><h3 id="useselector" tabindex="-1">useSelector <a class="header-anchor" href="#useselector" aria-label="Permalink to &quot;useSelector&quot;">​</a></h3><p>将state映射到组件中</p><ul><li>参数一：将state映射到需要的数据中</li><li>参数二：可以进行比较，来决定组件是否重新渲染</li></ul><p>默认情况下<code>useSelector</code>监听整个state的变化，只要state中有状态变量发生变化，无论当前组件是否使用到了这个状态变量，都会触发组件的重新渲染。这就需要我们显式地为其指定重新渲染的判断条件</p><blockquote><p><code>useSelector</code>会比较我们返回的两个对象是否相等：</p><div class="language-ts vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">ts</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">const</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> refEquality</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">a</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">b</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=&gt;</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">===</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> b);</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><p>只有两个对象全等时，才可以不触发重新渲染</p></blockquote><h3 id="usedispatch" tabindex="-1">useDispatch <a class="header-anchor" href="#usedispatch" aria-label="Permalink to &quot;useDispatch&quot;">​</a></h3><p>直接获取<code>dispatch</code>函数，之后在组件中直接调用即可</p><p>另外，我们还可以通过<code>useStore</code>来获取当前的store对象</p><p>拿之前Redux的计数器举例，使用<code>useSelector</code>与<code>useDispatch</code>进行重构：</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-yP61_" id="tab-aubCPnx" checked="checked"><label for="tab-aubCPnx">[Now] Counter.jsx</label><input type="radio" name="group-yP61_" id="tab-ua0QufB"><label for="tab-ua0QufB">[Prev] Counter.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// [Now] Counter.jsx</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { memo } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { memo } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { useSelector, useDispatch, shallowEqual } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react-redux&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { useSelector, useDispatch, shallowEqual } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react-redux&#39;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { addCount, subCount } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;../store/features/counter&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { addCount, subCount } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;../store/features/counter&#39;</span></span>

2
assets/note_React Hooks.md.4dKid3IM.lean.js → assets/note_React Hooks.md.DLqzL3NU.lean.js
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@@ -1 +1 @@
import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const l="/assets/useLayoutEffect.B_End6k1.svg",p="/assets/SSR.Ja5pYx3h.svg",F=JSON.parse('{"title":"React Hooks","description":"","frontmatter":{},"headers":[],"relativePath":"note/React Hooks.md","filePath":"note/React Hooks.md","lastUpdated":1712924096000}'),h={name:"note/React Hooks.md"},k=n("",207),t=[k];function e(r,E,d,g,y,c){return a(),i("div",null,t)}const b=s(h,[["render",e]]);export{F as __pageData,b as default}; import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const l="/assets/useLayoutEffect.B_End6k1.svg",p="/assets/SSR.Ja5pYx3h.svg",F=JSON.parse('{"title":"React Hooks","description":"","frontmatter":{},"headers":[],"relativePath":"note/React Hooks.md","filePath":"note/React Hooks.md","lastUpdated":1713715656000}'),h={name:"note/React Hooks.md"},k=n("",207),t=[k];function e(r,E,d,g,y,c){return a(),i("div",null,t)}const b=s(h,[["render",e]]);export{F as __pageData,b as default};

10
assets/note_React Router.md.w2qeGh8C.js → assets/note_React Router.md.CKY65iIZ.js
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@@ -1,4 +1,4 @@
import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const y=JSON.parse('{"title":"React Router","description":"","frontmatter":{},"headers":[],"relativePath":"note/React Router.md","filePath":"note/React Router.md","lastUpdated":1712924096000}'),l={name:"note/React Router.md"},p=n(`<h1 id="react-router" tabindex="-1">React Router <a class="header-anchor" href="#react-router" aria-label="Permalink to &quot;React Router&quot;">​</a></h1><h2 id="了解reactrouter" tabindex="-1">了解ReactRouter <a class="header-anchor" href="#了解reactrouter" aria-label="Permalink to &quot;了解ReactRouter&quot;">​</a></h2><p>三大框架都有各自的路由实现</p><ul><li>Angular ngRouter</li><li>React ReactRouter</li><li>Vue VueRouter</li></ul><p>React Router在最近两年的版本更新较快，并且在最新的React Router6发生了较大的变化</p><ul><li>Web开发只需要安装<code>react-router-dom</code></li><li><code>react-router</code>包含一些ReactNative的内容</li></ul><div class="language-bash vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">npm</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> i</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> react-router-dom</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><p>从<code>react-router-dom</code>中导出<code>BrowserRouter</code> 或 <code>HashRouter</code>，二者分别对应history模式与哈希模式</p><p>将App用二者之一包裹，即可启用路由：</p><div class="language-tsx vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// index.js</span></span> import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const y=JSON.parse('{"title":"React Router","description":"","frontmatter":{},"headers":[],"relativePath":"note/React Router.md","filePath":"note/React Router.md","lastUpdated":1713715656000}'),l={name:"note/React Router.md"},p=n(`<h1 id="react-router" tabindex="-1">React Router <a class="header-anchor" href="#react-router" aria-label="Permalink to &quot;React Router&quot;">​</a></h1><h2 id="了解reactrouter" tabindex="-1">了解ReactRouter <a class="header-anchor" href="#了解reactrouter" aria-label="Permalink to &quot;了解ReactRouter&quot;">​</a></h2><p>三大框架都有各自的路由实现</p><ul><li>Angular ngRouter</li><li>React ReactRouter</li><li>Vue VueRouter</li></ul><p>React Router在最近两年的版本更新较快，并且在最新的React Router6发生了较大的变化</p><ul><li>Web开发只需要安装<code>react-router-dom</code></li><li><code>react-router</code>包含一些ReactNative的内容</li></ul><div class="language-bash vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">bash</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">npm</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> i</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> react-router-dom</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><p>从<code>react-router-dom</code>中导出<code>BrowserRouter</code> 或 <code>HashRouter</code>，二者分别对应history模式与哈希模式</p><p>将App用二者之一包裹，即可启用路由：</p><div class="language-tsx vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// index.js</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> React, { StrictMode } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> React, { StrictMode } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ReactDOM </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react-dom/client&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> ReactDOM </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react-dom/client&#39;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> App </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;./App&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> App </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;./App&#39;</span></span>
@@ -38,7 +38,7 @@ import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const y
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;/</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;/</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br></div></div><p>另外，这里还有一个小技巧，在最末一个路由指定一个path为<code>*</code>的路由匹配规则，可以为路由匹配添加fallback策略，当未匹配到其之前的任何域名时，会展示NotFound页面</p><h2 id="嵌套路由" tabindex="-1">嵌套路由 <a class="header-anchor" href="#嵌套路由" aria-label="Permalink to &quot;嵌套路由&quot;">​</a></h2><p>嵌套路由可以通过在<code>Route</code>组件内部嵌套新的<code>Route</code>组件来实现</p><p>再通过<code>Outlet</code>组件来指定嵌套路由的占位元素（类似于VueRouter中的router-view）</p><p>我们在之前的例子的基础上，为Home页面添加两个子页面HomeRanking和HomeRecommand</p><p>同时，我们也应该为Home组件添加默认跳转，就像根路径默认重定向到Home组件那样，进入到Home组件后也应该默认重定向一个子页面中，这里我们仍然使用到了Navigate组件</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group--vkzm" id="tab-8MoePdA" checked="checked"><label for="tab-8MoePdA">App.jsx </label><input type="radio" name="group--vkzm" id="tab-vEUIsNG"><label for="tab-vEUIsNG">Home.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// App.jsx</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br><span class="line-number">20</span><br><span class="line-number">21</span><br><span class="line-number">22</span><br><span class="line-number">23</span><br><span class="line-number">24</span><br><span class="line-number">25</span><br><span class="line-number">26</span><br><span class="line-number">27</span><br><span class="line-number">28</span><br></div></div><p>另外，这里还有一个小技巧，在最末一个路由指定一个path为<code>*</code>的路由匹配规则，可以为路由匹配添加fallback策略，当未匹配到其之前的任何域名时，会展示NotFound页面</p><h2 id="嵌套路由" tabindex="-1">嵌套路由 <a class="header-anchor" href="#嵌套路由" aria-label="Permalink to &quot;嵌套路由&quot;">​</a></h2><p>嵌套路由可以通过在<code>Route</code>组件内部嵌套新的<code>Route</code>组件来实现</p><p>再通过<code>Outlet</code>组件来指定嵌套路由的占位元素（类似于VueRouter中的router-view）</p><p>我们在之前的例子的基础上，为Home页面添加两个子页面HomeRanking和HomeRecommand</p><p>同时，我们也应该为Home组件添加默认跳转，就像根路径默认重定向到Home组件那样，进入到Home组件后也应该默认重定向一个子页面中，这里我们仍然使用到了Navigate组件</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-xwhrH" id="tab-F-sk0gA" checked="checked"><label for="tab-F-sk0gA">App.jsx </label><input type="radio" name="group-xwhrH" id="tab-UzYzPbH"><label for="tab-UzYzPbH">Home.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// App.jsx</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> React, { PureComponent } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> React, { PureComponent } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react&#39;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { Routes, Route, Navigate, NavLink } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react-router-dom&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { Routes, Route, Navigate, NavLink } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react-router-dom&#39;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Home </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;./views/Home&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Home </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;./views/Home&#39;</span></span>
@@ -73,7 +73,7 @@ import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const y
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;/</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;/</span><span style="--shiki-light:#22863A;--shiki-dark:#85E89D;">div</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">&gt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br></div></div></div></div><h2 id="编程式导航-高阶组件" tabindex="-1">编程式导航（高阶组件） <a class="header-anchor" href="#编程式导航-高阶组件" aria-label="Permalink to &quot;编程式导航（高阶组件）&quot;">​</a></h2><p>之前使用的ReactRouter提供的路由跳转的组件，无论是<code>Link</code>还是<code>NavLink</code>可定制化能力都比较差，无法实现“点击按钮后跳转路由”这样的需求，那么我们就需要通过编程式导航，使用JS来完成路由的跳转</p><p>ReactRouter提供了编程式导航的API：<code>useNavigate</code></p><p>自ReactRouter6起，编程式导航的API不再支持ClassComponent，全面拥抱Hooks。</p><p>我们将在后续的学习中开启Hooks的写法，那么目前如何在类组件中也能使用Hooks呢？答案是高阶组件</p><p>封装一个高阶组件<code>withRouter</code>，经过高阶组件处理的类组件的props将会携带router对象，上面包含一些我们需要的属性和方法：</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-vmd81" id="tab-75k2Fao" checked="checked"><label for="tab-75k2Fao">withRouter.js</label><input type="radio" name="group-vmd81" id="tab-TCe-SqS"><label for="tab-TCe-SqS">Home.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// withRouter.js</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br></div></div></div></div><h2 id="编程式导航-高阶组件" tabindex="-1">编程式导航（高阶组件） <a class="header-anchor" href="#编程式导航-高阶组件" aria-label="Permalink to &quot;编程式导航（高阶组件）&quot;">​</a></h2><p>之前使用的ReactRouter提供的路由跳转的组件，无论是<code>Link</code>还是<code>NavLink</code>可定制化能力都比较差，无法实现“点击按钮后跳转路由”这样的需求，那么我们就需要通过编程式导航，使用JS来完成路由的跳转</p><p>ReactRouter提供了编程式导航的API：<code>useNavigate</code></p><p>自ReactRouter6起，编程式导航的API不再支持ClassComponent，全面拥抱Hooks。</p><p>我们将在后续的学习中开启Hooks的写法，那么目前如何在类组件中也能使用Hooks呢？答案是高阶组件</p><p>封装一个高阶组件<code>withRouter</code>，经过高阶组件处理的类组件的props将会携带router对象，上面包含一些我们需要的属性和方法：</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-CY7JV" id="tab--rX64tm" checked="checked"><label for="tab--rX64tm">withRouter.js</label><input type="radio" name="group-CY7JV" id="tab-Z3DOB3M"><label for="tab-Z3DOB3M">Home.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// withRouter.js</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { useNavigate } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react-router-dom&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { useNavigate } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react-router-dom&#39;</span></span>
<span class="line"></span> <span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> withRouter</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">WrapperComponent</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> withRouter</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">WrapperComponent</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span>
@@ -100,7 +100,7 @@ import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const y
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> )</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br></div></div></div></div><p>我们使用<code>withRouter</code>高阶组件对Home组件进行了增强，可以通过编程式导航来实现二级路由跳转</p><p>这里只是展示了编程式导航的用法和高阶组件的能力，目前还是尽可能使用Hooks写法编写新项目</p><h2 id="动态路由-路由传参" tabindex="-1">动态路由（路由传参） <a class="header-anchor" href="#动态路由-路由传参" aria-label="Permalink to &quot;动态路由（路由传参）&quot;">​</a></h2><p>传递参数由两种方式：</p><ul><li>动态路由的方式</li><li>查询字符串传递参数</li></ul><p>动态路由是指：路由中的<strong>路径</strong>信息并不会固定</p><ul><li>比如匹配规则为<code>/detail/:id</code>时，<code>/detail/123</code> <code>detail/888</code>都会被匹配上，并将<code>123/888</code>作为id参数传递</li><li>其中<code>/detail/:id</code>这个匹配规则被称为动态路由</li></ul><p>动态路由常见于嵌套路由跳转，比如：从歌曲列表页面点击后跳转到歌曲详情页，可以通过路由传递歌曲的ID，访问到不同歌曲的详情页</p><p>我们在之前的HomeRanking榜单中加入列表和点击跳转功能，并编写一个新的组件Detail来接收来自路由的参数</p><p>同样地，<code>react-router-dom</code>为我们提供了从路由获取参数的API：<code>useParams</code>，它是一个Hooks，我们将它应用到之前编写的高级组件<code>withRouter</code>中</p><ul><li>在使用了<code>withRouter</code>的组件中，就可以通过<code>this.props.router.params.xxx</code>获取到当前路由中传递的参数</li><li>使用动态匹配路由时，传递给Route组件的<code>path</code>属性为<code>:xxx</code>，这里是<code>/detail/:id</code></li></ul><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-SXxsE" id="tab-Zq-M3Jl" checked="checked"><label for="tab-Zq-M3Jl">withRouter.js</label><input type="radio" name="group-SXxsE" id="tab-DOtnJ-E"><label for="tab-DOtnJ-E">HomeRanking.jsx</label><input type="radio" name="group-SXxsE" id="tab-BLmaxuR"><label for="tab-BLmaxuR">Detail.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// withRouter.js</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br><span class="line-number">14</span><br><span class="line-number">15</span><br><span class="line-number">16</span><br><span class="line-number">17</span><br><span class="line-number">18</span><br><span class="line-number">19</span><br></div></div></div></div><p>我们使用<code>withRouter</code>高阶组件对Home组件进行了增强，可以通过编程式导航来实现二级路由跳转</p><p>这里只是展示了编程式导航的用法和高阶组件的能力，目前还是尽可能使用Hooks写法编写新项目</p><h2 id="动态路由-路由传参" tabindex="-1">动态路由（路由传参） <a class="header-anchor" href="#动态路由-路由传参" aria-label="Permalink to &quot;动态路由（路由传参）&quot;">​</a></h2><p>传递参数由两种方式：</p><ul><li>动态路由的方式</li><li>查询字符串传递参数</li></ul><p>动态路由是指：路由中的<strong>路径</strong>信息并不会固定</p><ul><li>比如匹配规则为<code>/detail/:id</code>时，<code>/detail/123</code> <code>detail/888</code>都会被匹配上，并将<code>123/888</code>作为id参数传递</li><li>其中<code>/detail/:id</code>这个匹配规则被称为动态路由</li></ul><p>动态路由常见于嵌套路由跳转，比如：从歌曲列表页面点击后跳转到歌曲详情页，可以通过路由传递歌曲的ID，访问到不同歌曲的详情页</p><p>我们在之前的HomeRanking榜单中加入列表和点击跳转功能，并编写一个新的组件Detail来接收来自路由的参数</p><p>同样地，<code>react-router-dom</code>为我们提供了从路由获取参数的API：<code>useParams</code>，它是一个Hooks，我们将它应用到之前编写的高级组件<code>withRouter</code>中</p><ul><li>在使用了<code>withRouter</code>的组件中，就可以通过<code>this.props.router.params.xxx</code>获取到当前路由中传递的参数</li><li>使用动态匹配路由时，传递给Route组件的<code>path</code>属性为<code>:xxx</code>，这里是<code>/detail/:id</code></li></ul><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-a15H_" id="tab-Hwc_0Pe" checked="checked"><label for="tab-Hwc_0Pe">withRouter.js</label><input type="radio" name="group-a15H_" id="tab--eFETBH"><label for="tab--eFETBH">HomeRanking.jsx</label><input type="radio" name="group-a15H_" id="tab-UDLWj4B"><label for="tab-UDLWj4B">Detail.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// withRouter.js</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { useNavigate, useParams } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react-router-dom&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { useNavigate, useParams } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react-router-dom&#39;</span></span>
<span class="line"></span> <span class="line"></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> withRouter</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">WrapperComponent</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">export</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> withRouter</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">WrapperComponent</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span>
@@ -165,7 +165,7 @@ import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.BFSS5Pox.js";const y
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> router</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { navigate, params, query }</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> const</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> router</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { navigate, params, query }</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">WrapperComponent</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">...</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">props} </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">router</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">{router} /&gt;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> &lt;</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">WrapperComponent</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">...</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">props} </span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">router</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">{router} /&gt;</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> }</span></span>
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><div class="tip custom-block"><p class="custom-block-title">TIP</p><p>需要注意的是，这里的<code>useSearchParams</code>是一个Hooks的常见形态</p><p>它返回一个数组，数组的首位为值，数组的次位为改变值的方法</p><p>与对象解构不同的是，数组结构是对位解构：保证位置一致则值一致，命名随意</p><p>而对象解构恰恰相反，不必保证位置，而需要保证命名一致</p></div><h2 id="路由的配置方式" tabindex="-1">路由的配置方式 <a class="header-anchor" href="#路由的配置方式" aria-label="Permalink to &quot;路由的配置方式&quot;">​</a></h2><p>至此为止，路由的配置是耦合在<code>App.jsx</code>中的，我们可以将Routes这部分代码抽离出单独的组件，也可以通过配置的方式来完成路由映射关系的编写</p><ul><li>在ReactRouter5版本中，我们可以将路由的映射规则写为JS对象，需要引入第三方库<code>react-router-config</code></li><li>在ReactRouter6版本中，允许我们将其写为配置文件，不需要安装其他内容</li></ul><p>6版本为我们提供了一个API：<code>useRoutes</code>，将我们编写的配置文件传入此函数，可以将其转化为之前编写的组件结构，本质上也是一种语法糖</p><p>需要注意的是，Hooks只能在函数式组件中使用，这里我们将App组件改用FunctionComponent书写了</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-nLlvJ" id="tab-OWj1Rbf" checked="checked"><label for="tab-OWj1Rbf">index.js</label><input type="radio" name="group-nLlvJ" id="tab-o1C-ydU"><label for="tab-o1C-ydU">App.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// router/index.js</span></span> <span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><div class="tip custom-block"><p class="custom-block-title">TIP</p><p>需要注意的是，这里的<code>useSearchParams</code>是一个Hooks的常见形态</p><p>它返回一个数组，数组的首位为值，数组的次位为改变值的方法</p><p>与对象解构不同的是，数组结构是对位解构：保证位置一致则值一致，命名随意</p><p>而对象解构恰恰相反，不必保证位置，而需要保证命名一致</p></div><h2 id="路由的配置方式" tabindex="-1">路由的配置方式 <a class="header-anchor" href="#路由的配置方式" aria-label="Permalink to &quot;路由的配置方式&quot;">​</a></h2><p>至此为止，路由的配置是耦合在<code>App.jsx</code>中的，我们可以将Routes这部分代码抽离出单独的组件，也可以通过配置的方式来完成路由映射关系的编写</p><ul><li>在ReactRouter5版本中，我们可以将路由的映射规则写为JS对象，需要引入第三方库<code>react-router-config</code></li><li>在ReactRouter6版本中，允许我们将其写为配置文件，不需要安装其他内容</li></ul><p>6版本为我们提供了一个API：<code>useRoutes</code>，将我们编写的配置文件传入此函数，可以将其转化为之前编写的组件结构，本质上也是一种语法糖</p><p>需要注意的是，Hooks只能在函数式组件中使用，这里我们将App组件改用FunctionComponent书写了</p><div class="vp-code-group vp-adaptive-theme"><div class="tabs"><input type="radio" name="group-640fi" id="tab-jo9OFfX" checked="checked"><label for="tab-jo9OFfX">index.js</label><input type="radio" name="group-640fi" id="tab-9d-DrrA"><label for="tab-9d-DrrA">App.jsx</label></div><div class="blocks"><div class="language-tsx vp-adaptive-theme active line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">tsx</span><pre class="shiki shiki-themes github-light github-dark vp-code"><code><span class="line"><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// router/index.js</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { Navigate } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react-router-dom&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> { Navigate } </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;react-router-dom&#39;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Home </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;../views/Home&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Home </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;../views/Home&#39;</span></span>
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> HomeRanking </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;../views/HomeRanking&#39;</span></span> <span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">import</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> HomeRanking </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">from</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> &#39;../views/HomeRanking&#39;</span></span>

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import{_ as s,c as i,o as a,ai as n}from"./chunks/framework.DKE0jNKv.js";const y=JSON.parse('{"title":"React Router","description":"","frontmatter":{},"headers":[],"relativePath":"note/React Router.md","filePath":"note/React Router.md","lastUpdated":1713715656000}'),l={name:"note/React Router.md"},p=n("",71),h=[p];function t(k,e,r,E,d,g){return a(),i("div",null,h)}const o=s(l,[["render",t]]);export{y as __pageData,o as default};

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