ZiuChen.github.io/assets/article_【用友金融】前端面试题总结.md.b76ce3fc.js

import{_ as s,o as a,c as n,a as l}from"./app.ab8d0b9f.js";const D=JSON.parse('{"title":"【用友金融】前端面试题总结","description":"","frontmatter":{},"headers":[{"level":2,"title":"回流与重绘","slug":"回流与重绘","link":"#回流与重绘","children":[]},{"level":2,"title":"CSS属性","slug":"css属性","link":"#css属性","children":[]},{"level":2,"title":"函数执行结果","slug":"函数执行结果","link":"#函数执行结果","children":[{"level":3,"title":"题目1","slug":"题目1","link":"#题目1","children":[]},{"level":3,"title":"题目2","slug":"题目2","link":"#题目2","children":[]},{"level":3,"title":"题目3","slug":"题目3","link":"#题目3","children":[]},{"level":3,"title":"题目4","slug":"题目4","link":"#题目4","children":[]},{"level":3,"title":"题目5","slug":"题目5","link":"#题目5","children":[]},{"level":3,"title":"题目6","slug":"题目6","link":"#题目6","children":[]},{"level":3,"title":"题目7","slug":"题目7","link":"#题目7","children":[]},{"level":3,"title":"题目8","slug":"题目8","link":"#题目8","children":[]}]},{"level":2,"title":"CSS权重的优先级","slug":"css权重的优先级","link":"#css权重的优先级","children":[]},{"level":2,"title":"HTTP状态码","slug":"http状态码","link":"#http状态码","children":[]},{"level":2,"title":"BFC(块级格式上下文)","slug":"bfc-块级格式上下文","link":"#bfc-块级格式上下文","children":[]},{"level":2,"title":"元素浮动","slug":"元素浮动","link":"#元素浮动","children":[]},{"level":2,"title":"HTTP请求方法","slug":"http请求方法","link":"#http请求方法","children":[]},{"level":2,"title":"跨域问题","slug":"跨域问题","link":"#跨域问题","children":[]},{"level":2,"title":"了解Webpack的哪些配置项","slug":"了解webpack的哪些配置项","link":"#了解webpack的哪些配置项","children":[]},{"level":2,"title":"判断变量类型","slug":"判断变量类型","link":"#判断变量类型","children":[]},{"level":2,"title":"JS浮点数相加精度问题","slug":"js浮点数相加精度问题","link":"#js浮点数相加精度问题","children":[]},{"level":2,"title":"简单讲讲Vue Router原理","slug":"简单讲讲vue-router原理","link":"#简单讲讲vue-router原理","children":[]},{"level":2,"title":"ES6熟悉吗","slug":"es6熟悉吗","link":"#es6熟悉吗","children":[]},{"level":2,"title":"CSS如何实现水平居中与垂直居中","slug":"css如何实现水平居中与垂直居中","link":"#css如何实现水平居中与垂直居中","children":[]}],"relativePath":"article/【用友金融】前端面试题总结.md","lastUpdated":1681706359000}'),e={name:"article/【用友金融】前端面试题总结.md"},p=l(`<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-hidden="true">#</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-hidden="true">#</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-hidden="true">#</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-hidden="true">#</a></h2><h3 id="题目1" tabindex="-1">题目1 <a class="header-anchor" href="#题目1" aria-hidden="true">#</a></h3><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">(</span><span style="color:#C792EA;">function</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">()</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">  </span><span style="color:#C792EA;">var</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">a</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">=</span><span style="color:#F07178;"> (</span><span style="color:#A6ACCD;">b</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">=</span><span style="color:#F07178;"> </span><span style="color:#F78C6C;">5</span><span style="color:#F07178;">)</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">)()</span><span style="color:#89DDFF;">;</span></span>
<span class="line"></span>
<span class="line"><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(b)</span><span style="color:#89DDFF;">;</span></span>
<span class="line"><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(a)</span><span style="color:#89DDFF;">;</span></span>
<span class="line"></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></div></div><p>结果为：</p><div class="language- line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">5</span></span>
<span class="line"><span style="color:#A6ACCD;">Error</span></span>
<span class="line"><span style="color:#A6ACCD;"></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><h3 id="题目2" tabindex="-1">题目2 <a class="header-anchor" href="#题目2" aria-hidden="true">#</a></h3><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">+</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">2</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">)</span></span>
<span class="line"><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">-</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">2</span><span style="color:#89DDFF;">&#39;</span><span style="color:#A6ACCD;">)</span></span>
<span class="line"></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><p>结果为：</p><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#F78C6C;">12</span></span>
<span class="line"><span style="color:#89DDFF;">-</span><span style="color:#F78C6C;">1</span></span>
<span class="line"></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><h3 id="题目3" tabindex="-1">题目3 <a class="header-anchor" href="#题目3" aria-hidden="true">#</a></h3><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> a </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">1</span></span>
<span class="line"></span>
<span class="line"><span style="color:#82AAFF;">setTimeout</span><span style="color:#A6ACCD;">(</span><span style="color:#C792EA;">function</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">()</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">  </span><span style="color:#A6ACCD;">a</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">=</span><span style="color:#F07178;"> </span><span style="color:#F78C6C;">2</span></span>
<span class="line"><span style="color:#F07178;">  </span><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#F07178;">(</span><span style="color:#A6ACCD;">a</span><span style="color:#F07178;">)</span></span>
<span class="line"><span style="color:#89DDFF;">},</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">0</span><span style="color:#A6ACCD;">)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> a</span></span>
<span class="line"><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(a)</span></span>
<span class="line"></span>
<span class="line"><span style="color:#A6ACCD;">a </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">3</span></span>
<span class="line"><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(a)</span></span>
<span class="line"></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>结果为：</p><div class="language- line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">1</span></span>
<span class="line"><span style="color:#A6ACCD;">3</span></span>
<span class="line"><span style="color:#A6ACCD;">2</span></span>
<span class="line"><span style="color:#A6ACCD;"></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><h3 id="题目4" tabindex="-1">题目4 <a class="header-anchor" href="#题目4" aria-hidden="true">#</a></h3><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#C792EA;">function</span><span style="color:#A6ACCD;"> </span><span style="color:#82AAFF;">f</span><span style="color:#89DDFF;">()</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">  </span><span style="color:#89DDFF;font-style:italic;">return</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">f</span></span>
<span class="line"><span style="color:#89DDFF;">}</span></span>
<span class="line"></span>
<span class="line"><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">new</span><span style="color:#A6ACCD;"> </span><span style="color:#82AAFF;">f</span><span style="color:#A6ACCD;">() </span><span style="color:#89DDFF;">instanceof</span><span style="color:#A6ACCD;"> </span><span style="color:#FFCB6B;">f</span><span style="color:#A6ACCD;">)</span></span>
<span class="line"></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></div></div><p>结果为：</p><div class="language- line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">false</span></span>
<span class="line"><span style="color:#A6ACCD;"></span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="题目5" tabindex="-1">题目5 <a class="header-anchor" href="#题目5" aria-hidden="true">#</a></h3><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> foo </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#A6ACCD;">  </span><span style="color:#82AAFF;">bar</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#C792EA;">function</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">()</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">    </span><span style="color:#89DDFF;font-style:italic;">return</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">this.</span><span style="color:#A6ACCD;">baz</span></span>
<span class="line"><span style="color:#F07178;">  </span><span style="color:#89DDFF;">},</span></span>
<span class="line"><span style="color:#A6ACCD;">  </span><span style="color:#F07178;">baz</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">1</span></span>
<span class="line"><span style="color:#89DDFF;">}</span></span>
<span class="line"></span>
<span class="line"><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">typeof</span><span style="color:#A6ACCD;"> (f </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> foo</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">bar)())</span></span>
<span class="line"></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></div></div><p>结果为：</p><div class="language- line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">undefined</span></span>
<span class="line"><span style="color:#A6ACCD;"></span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="题目6" tabindex="-1">题目6 <a class="header-anchor" href="#题目6" aria-hidden="true">#</a></h3><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> a </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> (b </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">1</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> c </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">2</span><span style="color:#A6ACCD;">)</span></span>
<span class="line"><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(a</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> b</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> c)</span></span>
<span class="line"></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><p>结果为：</p><div class="language- line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">2 1 2</span></span>
<span class="line"><span style="color:#A6ACCD;"></span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="题目7" tabindex="-1">题目7 <a class="header-anchor" href="#题目7" aria-hidden="true">#</a></h3><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> company </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#A6ACCD;">  </span><span style="color:#F07178;">address</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">&#39;</span><span style="color:#C3E88D;">beijing</span><span style="color:#89DDFF;">&#39;</span></span>
<span class="line"><span style="color:#89DDFF;">}</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C792EA;">var</span><span style="color:#A6ACCD;"> jjworld </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> Object</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">create</span><span style="color:#A6ACCD;">(company)</span></span>
<span class="line"><span style="color:#89DDFF;">delete</span><span style="color:#A6ACCD;"> jjworld</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">address</span></span>
<span class="line"><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(jjworld</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">address)</span></span>
<span class="line"></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></div></div><p>结果为：</p><div class="language- line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">beijing</span></span>
<span class="line"><span style="color:#A6ACCD;"></span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="题目8" tabindex="-1">题目8 <a class="header-anchor" href="#题目8" aria-hidden="true">#</a></h3><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#C792EA;">function</span><span style="color:#A6ACCD;"> </span><span style="color:#82AAFF;">side</span><span style="color:#89DDFF;">(</span><span style="color:#A6ACCD;font-style:italic;">arr</span><span style="color:#89DDFF;">)</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">  </span><span style="color:#A6ACCD;">arr</span><span style="color:#F07178;">[</span><span style="color:#F78C6C;">0</span><span style="color:#F07178;">] </span><span style="color:#89DDFF;">=</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">arr</span><span style="color:#F07178;">[</span><span style="color:#F78C6C;">2</span><span style="color:#F07178;">]</span></span>
<span class="line"><span style="color:#89DDFF;">}</span></span>
<span class="line"></span>
<span class="line"><span style="color:#C792EA;">function</span><span style="color:#A6ACCD;"> </span><span style="color:#82AAFF;">a</span><span style="color:#89DDFF;">(</span><span style="color:#A6ACCD;font-style:italic;">a</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#A6ACCD;font-style:italic;">b</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#A6ACCD;font-style:italic;">c</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">3</span><span style="color:#89DDFF;">)</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{</span></span>
<span class="line"><span style="color:#F07178;">  </span><span style="color:#A6ACCD;">c</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">=</span><span style="color:#F07178;"> </span><span style="color:#F78C6C;">10</span></span>
<span class="line"><span style="color:#F07178;">  </span><span style="color:#82AAFF;">side</span><span style="color:#F07178;">(</span><span style="color:#A6ACCD;">arguments</span><span style="color:#F07178;">)</span></span>
<span class="line"><span style="color:#F07178;">  </span><span style="color:#89DDFF;font-style:italic;">return</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">a</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">b</span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">+</span><span style="color:#F07178;"> </span><span style="color:#A6ACCD;">c</span></span>
<span class="line"><span style="color:#89DDFF;">}</span></span>
<span class="line"></span>
<span class="line"><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(</span><span style="color:#82AAFF;">a</span><span style="color:#A6ACCD;">(</span><span style="color:#F78C6C;">1</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">1</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">1</span><span style="color:#A6ACCD;">))</span></span>
<span class="line"></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></div></div><p>结果为：</p><div class="language- line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">12</span></span>
<span class="line"><span style="color:#A6ACCD;"></span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h2 id="css权重的优先级" tabindex="-1">CSS权重的优先级 <a class="header-anchor" href="#css权重的优先级" aria-hidden="true">#</a></h2><p>内联样式 &gt; ID选择器 &gt; 类选择器 &gt; 标签选择器 &gt; 通配符</p><h2 id="http状态码" tabindex="-1">HTTP状态码 <a class="header-anchor" href="#http状态码" aria-hidden="true">#</a></h2><p>越多越好</p><ul><li>400 临时重定向</li><li>500 服务器内部错误</li><li>404 服务器无法找到对应资源</li><li>200 请求正常处理</li></ul><h2 id="bfc-块级格式上下文" tabindex="-1">BFC(块级格式上下文) <a class="header-anchor" href="#bfc-块级格式上下文" aria-hidden="true">#</a></h2><p>下列选项对产生BFC描述错误的是：</p><ul><li>overflow为visible(x)</li><li>position为absolute</li><li>display为table-cell</li><li>float属性不为none</li></ul><h2 id="元素浮动" tabindex="-1">元素浮动 <a class="header-anchor" href="#元素浮动" aria-hidden="true">#</a></h2><p>设置元素浮动后，元素的display值哪个是正确的？</p><ul><li>inline-block</li><li>float</li><li>inline</li><li>block(√)</li></ul><h2 id="http请求方法" tabindex="-1">HTTP请求方法 <a class="header-anchor" href="#http请求方法" aria-hidden="true">#</a></h2><p>下面哪个选项不是HTTP的请求方法</p><ul><li>HEAD</li><li>PUT</li><li>OPTIONS</li><li>PUSH(x)</li></ul><p>HTTP请求方法有：</p><p><code>GET POST DELETE PUT OPTIONS</code><code>CONNECT HEAD PATCH TRACE</code></p><h2 id="跨域问题" tabindex="-1">跨域问题 <a class="header-anchor" href="#跨域问题" aria-hidden="true">#</a></h2><p>通常有哪些方法解决跨域问题？</p><ul><li>利用JSONP</li><li>反向代理</li><li>服务器配置CORS</li></ul><h2 id="了解webpack的哪些配置项" tabindex="-1">了解Webpack的哪些配置项 <a class="header-anchor" href="#了解webpack的哪些配置项" aria-hidden="true">#</a></h2><ul><li><code>resolve.alias</code> 为路径设置别名</li><li><code>resolve.extensionAlias</code> 后缀省略时 按此顺序指定的后缀名解析文件</li><li><code>module.rules</code> 包含<code>test</code> <code>loader</code> <code>option</code> 正则匹配后缀名 使用指定的loader解析文件</li></ul><h2 id="判断变量类型" tabindex="-1">判断变量类型 <a class="header-anchor" href="#判断变量类型" aria-hidden="true">#</a></h2><p>直接使用<code>typeof</code>无法判断引用类型变量的类型</p><div class="language-js line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki material-theme-palenight"><code><span class="line"><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">typeof</span><span style="color:#A6ACCD;"> []) </span><span style="color:#676E95;font-style:italic;">// object</span></span>
<span class="line"><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">typeof</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">{}</span><span style="color:#A6ACCD;">) </span><span style="color:#676E95;font-style:italic;">// object</span></span>
<span class="line"><span style="color:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">typeof</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">null</span><span style="color:#A6ACCD;">) </span><span style="color:#676E95;font-style:italic;">// object</span></span>
<span class="line"></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><h2 id="js浮点数相加精度问题" tabindex="-1">JS浮点数相加精度问题 <a class="header-anchor" href="#js浮点数相加精度问题" aria-hidden="true">#</a></h2><h2 id="简单讲讲vue-router原理" tabindex="-1">简单讲讲Vue Router原理 <a class="header-anchor" href="#简单讲讲vue-router原理" aria-hidden="true">#</a></h2><h2 id="es6熟悉吗" tabindex="-1">ES6熟悉吗 <a class="header-anchor" href="#es6熟悉吗" aria-hidden="true">#</a></h2><p><a href="https://es6.ruanyifeng.com/" target="_blank" rel="noreferrer">ES6教程</a></p><ul><li><code>let</code> <code>const</code></li><li>解构赋值 扩展运算符 可选链</li><li><code>Promise</code> <code>Async</code></li><li><code>Class</code> <code>Set</code> <code>Map</code> <code>Symbol</code> <code>Proxy</code></li></ul><h2 id="css如何实现水平居中与垂直居中" tabindex="-1">CSS如何实现水平居中与垂直居中 <a class="header-anchor" href="#css如何实现水平居中与垂直居中" aria-hidden="true">#</a></h2><p>参见<a href="./../note/CSS.html">CSS学习笔记</a></p>`,71),o=[p];function r(c,t,i,d,y,C){return a(),n("div",null,o)}const F=s(e,[["render",r]]);export{D as __pageData,F as default};