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data-v-4a3e3544>一文读懂函数中this指向问题</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E4%BB%8E0%E5%AE%9E%E7%8E%B0%E4%B8%80%E4%B8%AA%E5%B9%B4%E5%BA%A6%E6%8A%A5%E5%91%8A.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>从0实现一个年度报告</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E5%BD%BB%E5%BA%95%E6%90%9E%E6%87%82%E5%AF%B9%E8%B1%A1%E7%9A%84%E6%95%B0%E6%8D%AE%E5%B1%9E%E6%80%A7%E6%8F%8F%E8%BF%B0%E7%AC%A6%E3%80%81%E5%AD%98%E5%82%A8%E5%B1%9E%E6%80%A7%E6%8F%8F%E8%BF%B0%E7%AC%A6.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>彻底搞懂对象的数据属性描述符、存储属性描述符</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E6%B5%85%E6%9E%90defineProperty%E4%B8%8EProxy%E5%AE%9E%E7%8E%B0%E7%9A%84%E5%8F%8C%E5%90%91%E7%BB%91%E5%AE%9A.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>浅析defineProperty与Proxy实现的双向绑定</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5JavaScript%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>深入JavaScript数据类型</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5Vue3%E6%BA%90%E7%A0%81%EF%BC%8C%E7%9C%8B%E7%9C%8BVue.use%E5%90%8E%E7%A9%B6%E7%AB%9F%E5%8F%91%E7%94%9F%E4%BA%86%E4%BB%80%E4%B9%88%EF%BC%9F.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>深入Vue3源码，看看Vue.use后究竟发生了什么？</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3Proxy%E4%B8%8EReflect.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>深入理解Proxy与Reflect</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3%E6%B5%8F%E8%A7%88%E5%99%A8%E7%BC%93%E5%AD%98%E6%9C%BA%E5%88%B6.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>深入理解浏览器缓存机制</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/article/%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3%E6%B5%8F%E8%A7%88%E5%99%A8%E8%BF%90%E8%A1%8C%E5%8E%9F%E7%90%86.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>深入理解浏览器运行原理</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-0e1b55d4><section class="VPSidebarItem level-0 collapsible collapsed" data-v-0e1b55d4 data-v-4a3e3544><div class="item" role="button" tabindex="0" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><h2 class="text" data-v-4a3e3544>学习笔记</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-4a3e3544><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-4a3e3544><path d="M9,19c-0.3,0-0.5-0.1-0.7-0.3c-0.4-0.4-0.4-1,0-1.4l5.3-5.3L8.3,6.7c-0.4-0.4-0.4-1,0-1.4s1-0.4,1.4,0l6,6c0.4,0.4,0.4,1,0,1.4l-6,6C9.5,18.9,9.3,19,9,19z"></path></svg></div></div><div class="items" data-v-4a3e3544><!--[--><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/JavaScript.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>JavaScript基础</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/CSS.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>CSS基础</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/JavaScriptEnhanced.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>JavaScript进阶</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/Front-end%20Engineering.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>前端工程化</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/SSR.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>服务端渲染</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/React.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>React基础</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/React%20Hooks.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>React Hooks</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/Redux.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>Redux</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/React%20Router.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>React Router</p><!--]--></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-4a3e3544 data-v-4a3e3544><div class="item" data-v-4a3e3544><div class="indicator" data-v-4a3e3544></div><a class="VPLink link link" href="/note/MySQL.html" data-v-4a3e3544><!--[--><p class="text" data-v-4a3e3544>MySQL</p><!--]--></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-9d158fda data-v-585eef7d><div class="VPDoc has-sidebar has-aside" data-v-585eef7d data-v-a686a8a6><!--[--><!--]--><div class="container" data-v-a686a8a6><div class="aside" data-v-a686a8a6><div class="aside-curtain" data-v-a686a8a6></div><div class="aside-container" data-v-a686a8a6><div class="aside-content" data-v-a686a8a6><div class="VPDocAside" data-v-a686a8a6 data-v-31570b60><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" role="navigation" data-v-31570b60 data-v-ba8455b5><div class="content" data-v-ba8455b5><div class="outline-marker" data-v-ba8455b5></div><div class="outline-title" role="heading" aria-level="2" data-v-ba8455b5>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-ba8455b5><span class="visually-hidden" id="doc-outline-aria-label" data-v-ba8455b5> Table of Contents for current page </span><ul class="root" data-v-ba8455b5 data-v-6713c9cc><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-31570b60></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-a686a8a6><div class="content-container" data-v-a686a8a6><!--[--><!--]--><!----><main class="main" data-v-a686a8a6><div style="position:relative;" class="vp-doc _article_%E6%B5%85%E6%9E%90defineProperty%E4%B8%8EProxy%E5%AE%9E%E7%8E%B0%E7%9A%84%E5%8F%8C%E5%90%91%E7%BB%91%E5%AE%9A" data-v-a686a8a6><div><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 "浅析defineProperty与Proxy实现的双向绑定""></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 "🔰 Vue2的响应式原理""></a></h2><p><img src="https://v2.cn.vuejs.org/images/data.png" alt="image.png"></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"></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 github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;"> <</span><span style="color:#85E89D;">body</span><span style="color:#E1E4E8;">></span></span>
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<span class="line"><span style="color:#E1E4E8;"> <</span><span style="color:#85E89D;">input</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">type</span><span style="color:#E1E4E8;">=</span><span style="color:#9ECBFF;">"text"</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">id</span><span style="color:#E1E4E8;">=</span><span style="color:#9ECBFF;">"input"</span><span style="color:#E1E4E8;"> /></span></span>
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<span class="line"><span style="color:#E1E4E8;"> <</span><span style="color:#85E89D;">button</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">onclick</span><span style="color:#E1E4E8;">=</span><span style="color:#9ECBFF;">"</span><span style="color:#E1E4E8;">vm</span><span style="color:#9ECBFF;">.</span><span style="color:#E1E4E8;">text</span><span style="color:#F97583;">=</span><span style="color:#9ECBFF;">'Hello, World.'"</span><span style="color:#E1E4E8;">>Modify vm.text</</span><span style="color:#85E89D;">button</span><span style="color:#E1E4E8;">></span></span>
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<span class="line"><span style="color:#E1E4E8;"> <</span><span style="color:#85E89D;">div</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">class</span><span style="color:#E1E4E8;">=</span><span style="color:#9ECBFF;">"vBox"</span><span style="color:#E1E4E8;">></</span><span style="color:#85E89D;">div</span><span style="color:#E1E4E8;">></span></span>
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<span class="line"><span style="color:#E1E4E8;"> <</span><span style="color:#85E89D;">script</span><span style="color:#E1E4E8;">></span></span>
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<span class="line"><span style="color:#E1E4E8;"> </span><span style="color:#6A737D;">// 定义响应式数据</span></span>
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<span class="line"><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> vm </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> {}</span></span>
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<span class="line"><span style="color:#E1E4E8;"> Object.</span><span style="color:#B392F0;">defineProperty</span><span style="color:#E1E4E8;">(vm, </span><span style="color:#9ECBFF;">"text"</span><span style="color:#E1E4E8;">, {</span></span>
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<span class="line"><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">set</span><span style="color:#E1E4E8;">: (</span><span style="color:#FFAB70;">value</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">=></span><span style="color:#E1E4E8;"> {</span></span>
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<span class="line"><span style="color:#E1E4E8;"> </span><span style="color:#6A737D;">// 对象属性值被修改时，setter函数被自动触发</span></span>
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<span class="line"><span style="color:#E1E4E8;"> document.</span><span style="color:#B392F0;">querySelector</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">"#input"</span><span style="color:#E1E4E8;">).value </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> value</span></span>
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<span class="line"><span style="color:#E1E4E8;"> document.</span><span style="color:#B392F0;">querySelector</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">".vBox"</span><span style="color:#E1E4E8;">).innerHTML </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> value</span></span>
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<span class="line"><span style="color:#E1E4E8;"> },</span></span>
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<span class="line"><span style="color:#E1E4E8;"> })</span></span>
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<span class="line"><span style="color:#E1E4E8;"> </span><span style="color:#6A737D;">// 监听输入行为</span></span>
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<span class="line"><span style="color:#E1E4E8;"> document.</span><span style="color:#B392F0;">querySelector</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">"#input"</span><span style="color:#E1E4E8;">).</span><span style="color:#B392F0;">addEventListener</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">"input"</span><span style="color:#E1E4E8;">, (</span><span style="color:#FFAB70;">e</span><span style="color:#E1E4E8;">) </span><span style="color:#F97583;">=></span><span style="color:#E1E4E8;"> {</span></span>
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<span class="line"><span style="color:#E1E4E8;"> vm.text </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> e.target.value</span></span>
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<span class="line"><span style="color:#E1E4E8;"> })</span></span>
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<span class="line"><span style="color:#E1E4E8;"> </</span><span style="color:#85E89D;">script</span><span style="color:#E1E4E8;">></span></span>
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<span class="line"><span style="color:#E1E4E8;"> </</span><span style="color:#85E89D;">body</span><span style="color:#E1E4E8;">></span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;"> <</span><span style="color:#22863A;">body</span><span style="color:#24292E;">></span></span>
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<span class="line"><span style="color:#24292E;"> <</span><span style="color:#22863A;">input</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">type</span><span style="color:#24292E;">=</span><span style="color:#032F62;">"text"</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">id</span><span style="color:#24292E;">=</span><span style="color:#032F62;">"input"</span><span style="color:#24292E;"> /></span></span>
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<span class="line"><span style="color:#24292E;"> <</span><span style="color:#22863A;">button</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">onclick</span><span style="color:#24292E;">=</span><span style="color:#032F62;">"</span><span style="color:#24292E;">vm</span><span style="color:#032F62;">.</span><span style="color:#24292E;">text</span><span style="color:#D73A49;">=</span><span style="color:#032F62;">'Hello, World.'"</span><span style="color:#24292E;">>Modify vm.text</</span><span style="color:#22863A;">button</span><span style="color:#24292E;">></span></span>
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<span class="line"><span style="color:#24292E;"> <</span><span style="color:#22863A;">div</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">class</span><span style="color:#24292E;">=</span><span style="color:#032F62;">"vBox"</span><span style="color:#24292E;">></</span><span style="color:#22863A;">div</span><span style="color:#24292E;">></span></span>
|
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<span class="line"><span style="color:#24292E;"> <</span><span style="color:#22863A;">script</span><span style="color:#24292E;">></span></span>
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<span class="line"><span style="color:#24292E;"> </span><span style="color:#6A737D;">// 定义响应式数据</span></span>
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<span class="line"><span style="color:#24292E;"> </span><span style="color:#D73A49;">let</span><span style="color:#24292E;"> vm </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> {}</span></span>
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<span class="line"><span style="color:#24292E;"> Object.</span><span style="color:#6F42C1;">defineProperty</span><span style="color:#24292E;">(vm, </span><span style="color:#032F62;">"text"</span><span style="color:#24292E;">, {</span></span>
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<span class="line"><span style="color:#24292E;"> </span><span style="color:#6F42C1;">set</span><span style="color:#24292E;">: (</span><span style="color:#E36209;">value</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">=></span><span style="color:#24292E;"> {</span></span>
|
||
<span class="line"><span style="color:#24292E;"> </span><span style="color:#6A737D;">// 对象属性值被修改时，setter函数被自动触发</span></span>
|
||
<span class="line"><span style="color:#24292E;"> document.</span><span style="color:#6F42C1;">querySelector</span><span style="color:#24292E;">(</span><span style="color:#032F62;">"#input"</span><span style="color:#24292E;">).value </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> value</span></span>
|
||
<span class="line"><span style="color:#24292E;"> document.</span><span style="color:#6F42C1;">querySelector</span><span style="color:#24292E;">(</span><span style="color:#032F62;">".vBox"</span><span style="color:#24292E;">).innerHTML </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> value</span></span>
|
||
<span class="line"><span style="color:#24292E;"> },</span></span>
|
||
<span class="line"><span style="color:#24292E;"> })</span></span>
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||
<span class="line"><span style="color:#24292E;"> </span><span style="color:#6A737D;">// 监听输入行为</span></span>
|
||
<span class="line"><span style="color:#24292E;"> document.</span><span style="color:#6F42C1;">querySelector</span><span style="color:#24292E;">(</span><span style="color:#032F62;">"#input"</span><span style="color:#24292E;">).</span><span style="color:#6F42C1;">addEventListener</span><span style="color:#24292E;">(</span><span style="color:#032F62;">"input"</span><span style="color:#24292E;">, (</span><span style="color:#E36209;">e</span><span style="color:#24292E;">) </span><span style="color:#D73A49;">=></span><span style="color:#24292E;"> {</span></span>
|
||
<span class="line"><span style="color:#24292E;"> vm.text </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> e.target.value</span></span>
|
||
<span class="line"><span style="color:#24292E;"> })</span></span>
|
||
<span class="line"><span style="color:#24292E;"> </</span><span style="color:#22863A;">script</span><span style="color:#24292E;">></span></span>
|
||
<span class="line"><span style="color:#24292E;"> </</span><span style="color:#22863A;">body</span><span style="color:#24292E;">></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></div></div><p>通过 <code>defineProperty</code> 实现的响应式，<strong>不能检测</strong>数组和对象的变化：</p><p><strong>对于对象：</strong></p><p>Vue 无法检测 property 的添加或移除。</p><p>var vm = new Vue({ data:{ a:1 } }) // <code>vm.a</code> 是响应式的 vm.b = 2 // <code>vm.b</code> 是非响应式的</p><p><strong>对于数组：</strong></p><ol><li>当你利用索引直接设置一个数组项时，例如：<code>vm.items[indexOfItem] = newValue</code></li><li>当你修改数组的长度时，例如：<code>vm.items.length = newLength</code></li></ol><h2 id="🔰-vue3的响应式原理" tabindex="-1">🔰 Vue3的响应式原理 <a class="header-anchor" href="#🔰-vue3的响应式原理" aria-label="Permalink to "🔰 Vue3的响应式原理""></a></h2></div></div></main><footer class="VPDocFooter" data-v-a686a8a6 data-v-0b8e2cba><!--[--><!--]--><div class="edit-info" data-v-0b8e2cba><div class="edit-link" data-v-0b8e2cba><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/ZiuChen/ZiuChen.github.io/edit/main/docs/article/浅析defineProperty与Proxy实现的双向绑定.md" target="_blank" rel="noreferrer" data-v-0b8e2cba><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-0b8e2cba><path d="M18,23H4c-1.7,0-3-1.3-3-3V6c0-1.7,1.3-3,3-3h7c0.6,0,1,0.4,1,1s-0.4,1-1,1H4C3.4,5,3,5.4,3,6v14c0,0.6,0.4,1,1,1h14c0.6,0,1-0.4,1-1v-7c0-0.6,0.4-1,1-1s1,0.4,1,1v7C21,21.7,19.7,23,18,23z"></path><path d="M8,17c-0.3,0-0.5-0.1-0.7-0.3C7,16.5,6.9,16.1,7,15.8l1-4c0-0.2,0.1-0.3,0.3-0.5l9.5-9.5c1.2-1.2,3.2-1.2,4.4,0c1.2,1.2,1.2,3.2,0,4.4l-9.5,9.5c-0.1,0.1-0.3,0.2-0.5,0.3l-4,1C8.2,17,8.1,17,8,17zM9.9,12.5l-0.5,2.1l2.1-0.5l9.3-9.3c0.4-0.4,0.4-1.1,0-1.6c-0.4-0.4-1.2-0.4-1.6,0l0,0L9.9,12.5z M18.5,2.5L18.5,2.5L18.5,2.5z"></path></svg> Edit this page on GitHub<!--]--></a></div><div class="last-updated" data-v-0b8e2cba><p class="VPLastUpdated" data-v-0b8e2cba data-v-a6f11a31>Updated Date: <time datetime="2024-01-06T06:57:39.000Z" data-v-a6f11a31></time></p></div></div><nav class="prev-next" data-v-0b8e2cba><div class="pager" data-v-0b8e2cba><a class="pager-link prev" href="/article/%E5%BD%BB%E5%BA%95%E6%90%9E%E6%87%82%E5%AF%B9%E8%B1%A1%E7%9A%84%E6%95%B0%E6%8D%AE%E5%B1%9E%E6%80%A7%E6%8F%8F%E8%BF%B0%E7%AC%A6%E3%80%81%E5%AD%98%E5%82%A8%E5%B1%9E%E6%80%A7%E6%8F%8F%E8%BF%B0%E7%AC%A6.html" data-v-0b8e2cba><span class="desc" data-v-0b8e2cba>Previous page</span><span class="title" data-v-0b8e2cba>彻底搞懂对象的数据属性描述符、存储属性描述符</span></a></div><div class="pager" data-v-0b8e2cba><a class="pager-link next" href="/article/%E6%B7%B1%E5%85%A5JavaScript%E6%95%B0%E6%8D%AE%E7%B1%BB%E5%9E%8B.html" data-v-0b8e2cba><span class="desc" data-v-0b8e2cba>Next page</span><span class="title" data-v-0b8e2cba>深入JavaScript数据类型</span></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-9d158fda data-v-2c80950a><div class="container" data-v-2c80950a><p class="message" data-v-2c80950a>Released under the MIT License.</p><p class="copyright" data-v-2c80950a>Copyright © 2019-present Ziu Chen</p></div></footer><!--[--><!--]--></div></div>
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