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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-79816cba data-v-fd6e3585><!--[--><p class="text" data-v-79816cba>深入JavaScript数据类型</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-79816cba data-v-79816cba><div class="item" data-v-79816cba><div class="indicator" data-v-79816cba></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-79816cba data-v-fd6e3585><!--[--><p class="text" data-v-79816cba>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-79816cba data-v-79816cba><div class="item" data-v-79816cba><div class="indicator" data-v-79816cba></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-79816cba data-v-fd6e3585><!--[--><p class="text" data-v-79816cba>深入理解Proxy与Reflect</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-79816cba data-v-79816cba><div class="item" data-v-79816cba><div class="indicator" data-v-79816cba></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-79816cba data-v-fd6e3585><!--[--><p class="text" data-v-79816cba>深入理解浏览器缓存机制</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-79816cba data-v-79816cba><div class="item" data-v-79816cba><div class="indicator" data-v-79816cba></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-79816cba data-v-fd6e3585><!--[--><p class="text" data-v-79816cba>深入理解浏览器运行原理</p><!--]--><!----></a><!----></div><!----></div><!--]--></div></section></div><div class="group" data-v-5081c0c7><section class="VPSidebarItem level-0 collapsible collapsed" data-v-5081c0c7 data-v-79816cba><div class="item" role="button" tabindex="0" data-v-79816cba><div class="indicator" data-v-79816cba></div><h2 class="text" data-v-79816cba>学习笔记</h2><div class="caret" role="button" aria-label="toggle section" tabindex="0" data-v-79816cba><svg xmlns="http://www.w3.org/2000/svg" aria-hidden="true" focusable="false" viewbox="0 0 24 24" class="caret-icon" data-v-79816cba><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-79816cba><!--[--><div class="VPSidebarItem level-1 is-link" data-v-79816cba data-v-79816cba><div class="item" data-v-79816cba><div class="indicator" data-v-79816cba></div><a class="VPLink link link" href="/note/JavaScript.html" data-v-79816cba data-v-fd6e3585><!--[--><p class="text" data-v-79816cba>JavaScript基础</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-79816cba data-v-79816cba><div class="item" data-v-79816cba><div class="indicator" data-v-79816cba></div><a class="VPLink link link" href="/note/CSS.html" data-v-79816cba data-v-fd6e3585><!--[--><p class="text" data-v-79816cba>CSS基础</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-79816cba data-v-79816cba><div class="item" data-v-79816cba><div class="indicator" data-v-79816cba></div><a class="VPLink link link" href="/note/JavaScriptEnhanced.html" data-v-79816cba data-v-fd6e3585><!--[--><p class="text" data-v-79816cba>JavaScript进阶</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-79816cba data-v-79816cba><div class="item" data-v-79816cba><div class="indicator" data-v-79816cba></div><a class="VPLink link link" href="/note/Front-end%20Engineering.html" data-v-79816cba data-v-fd6e3585><!--[--><p class="text" data-v-79816cba>前端工程化</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-79816cba data-v-79816cba><div class="item" data-v-79816cba><div class="indicator" data-v-79816cba></div><a class="VPLink link link" href="/note/SSR.html" data-v-79816cba data-v-fd6e3585><!--[--><p class="text" data-v-79816cba>服务端渲染</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-79816cba data-v-79816cba><div class="item" data-v-79816cba><div class="indicator" data-v-79816cba></div><a class="VPLink link link" href="/note/React.html" data-v-79816cba data-v-fd6e3585><!--[--><p class="text" data-v-79816cba>React基础</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-79816cba data-v-79816cba><div class="item" data-v-79816cba><div class="indicator" data-v-79816cba></div><a class="VPLink link link" href="/note/Redux.html" data-v-79816cba data-v-fd6e3585><!--[--><p class="text" data-v-79816cba>Redux</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-79816cba data-v-79816cba><div class="item" data-v-79816cba><div class="indicator" data-v-79816cba></div><a class="VPLink link link" href="/note/React%20Router.html" data-v-79816cba data-v-fd6e3585><!--[--><p class="text" data-v-79816cba>React Router</p><!--]--><!----></a><!----></div><!----></div><div class="VPSidebarItem level-1 is-link" data-v-79816cba data-v-79816cba><div class="item" data-v-79816cba><div class="indicator" data-v-79816cba></div><a class="VPLink link link" href="/note/MySQL.html" data-v-79816cba data-v-fd6e3585><!--[--><p class="text" data-v-79816cba>MySQL</p><!--]--><!----></a><!----></div><!----></div><!--]--></div></section></div><!--]--><!--[--><!--]--></nav></aside><div class="VPContent has-sidebar" id="VPContent" data-v-6305e88a data-v-435404df><div class="VPDoc has-sidebar has-aside" data-v-435404df data-v-25140dfd><!--[--><!--]--><div class="container" data-v-25140dfd><div class="aside" data-v-25140dfd><div class="aside-curtain" data-v-25140dfd></div><div class="aside-container" data-v-25140dfd><div class="aside-content" data-v-25140dfd><div class="VPDocAside" data-v-25140dfd data-v-2b53d15f><!--[--><!--]--><!--[--><!--]--><div class="VPDocAsideOutline" data-v-2b53d15f data-v-1cf492a7><div class="content" data-v-1cf492a7><div class="outline-marker" data-v-1cf492a7></div><div class="outline-title" data-v-1cf492a7>On this page</div><nav aria-labelledby="doc-outline-aria-label" data-v-1cf492a7><span class="visually-hidden" id="doc-outline-aria-label" data-v-1cf492a7> Table of Contents for current page </span><ul class="root" data-v-1cf492a7 data-v-e09875d9><!--[--><!--]--></ul></nav></div></div><!--[--><!--]--><div class="spacer" data-v-2b53d15f></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-25140dfd><div class="content-container" data-v-25140dfd><!--[--><!--]--><!----><main class="main" data-v-25140dfd><div style="position:relative;" class="vp-doc _article_%E3%80%90%E7%94%A8%E5%8F%8B%E9%87%91%E8%9E%8D%E3%80%91%E5%89%8D%E7%AB%AF%E9%9D%A2%E8%AF%95%E9%A2%98%E6%80%BB%E7%BB%93" data-v-25140dfd><div><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 "【用友金融】前端面试题总结""></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 "回流与重绘""></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 "CSS属性""></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 "函数执行结果""></a></h2><h3 id="题目1" tabindex="-1">题目1 <a class="header-anchor" href="#题目1" aria-label="Permalink to "题目1""></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>
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<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>
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<span class="line"><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">)()</span><span style="color:#89DDFF;">;</span></span>
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<span class="line"></span>
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||
<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>
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<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></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>
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<span class="line"><span style="color:#A6ACCD;">Error</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-label="Permalink to "题目2""></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;">'</span><span style="color:#C3E88D;">2</span><span style="color:#89DDFF;">'</span><span style="color:#A6ACCD;">)</span></span>
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||
<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;">'</span><span style="color:#C3E88D;">2</span><span style="color:#89DDFF;">'</span><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><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>
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<span class="line"><span style="color:#89DDFF;">-</span><span style="color:#F78C6C;">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></div></div><h3 id="题目3" tabindex="-1">题目3 <a class="header-anchor" href="#题目3" aria-label="Permalink to "题目3""></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>
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||
<span class="line"></span>
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||
<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>
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<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>
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||
<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>
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<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>
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||
<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>
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||
<span class="line"></span>
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||
<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>
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||
<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></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>
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||
<span class="line"><span style="color:#A6ACCD;">3</span></span>
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||
<span class="line"><span style="color:#A6ACCD;">2</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-label="Permalink to "题目4""></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>
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||
<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></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></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-label="Permalink to "题目5""></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>
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||
<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></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></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-label="Permalink to "题目6""></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></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></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-label="Permalink to "题目7""></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;">'</span><span style="color:#C3E88D;">beijing</span><span style="color:#89DDFF;">'</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></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></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-label="Permalink to "题目8""></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></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></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-label="Permalink to "CSS权重的优先级""></a></h2><p>内联样式 > ID选择器 > 类选择器 > 标签选择器 > 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-label="Permalink to "HTTP状态码""></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-label="Permalink to "BFC(块级格式上下文)""></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-label="Permalink to "元素浮动""></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-label="Permalink to "HTTP请求方法""></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-label="Permalink to "跨域问题""></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-label="Permalink to "了解Webpack的哪些配置项""></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-label="Permalink to "判断变量类型""></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>
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<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></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-label="Permalink to "JS浮点数相加精度问题""></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-label="Permalink to "简单讲讲Vue Router原理""></a></h2><h2 id="es6熟悉吗" tabindex="-1">ES6熟悉吗 <a class="header-anchor" href="#es6熟悉吗" aria-label="Permalink to "ES6熟悉吗""></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-label="Permalink to "CSS如何实现水平居中与垂直居中""></a></h2><p>参见<a href="./../note/CSS.html">CSS学习笔记</a></p></div></div></main><footer class="VPDocFooter" data-v-25140dfd data-v-b9eb50cb><!--[--><!--]--><div class="edit-info" data-v-b9eb50cb><div class="edit-link" data-v-b9eb50cb><a class="VPLink link edit-link-button" href="https://github.com/ZiuChen/ZiuChen.github.io/edit/main/docs/article/【用友金融】前端面试题总结.md" target="_blank" rel="noreferrer" data-v-b9eb50cb data-v-fd6e3585><!--[--><svg xmlns="http://www.w3.org/2000/svg" viewbox="0 0 24 24" class="edit-link-icon" aria-label="edit icon" data-v-b9eb50cb><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-b9eb50cb><p class="VPLastUpdated" data-v-b9eb50cb data-v-f683efee>Updated Date: <time datetime="2023-04-29T15:23:56.000Z" data-v-f683efee></time></p></div></div><div class="prev-next" data-v-b9eb50cb><div class="pager" data-v-b9eb50cb><a class="pager-link prev" href="/article/%E3%80%90%E5%BF%AB%E6%89%8B%E3%80%91%E6%B7%B1%E5%85%A5%E7%90%86%E8%A7%A3%E5%89%8D%E7%AB%AF%E9%9D%A2%E8%AF%95%E9%A2%98.html" data-v-b9eb50cb><span class="desc" data-v-b9eb50cb>Previous page</span><span class="title" data-v-b9eb50cb>【快手】深入理解前端面试题</span></a></div><div class="has-prev pager" data-v-b9eb50cb><a class="pager-link next" href="/article/%E4%B8%80%E6%96%87%E8%AF%BB%E6%87%82%E4%BA%8B%E4%BB%B6%E5%86%92%E6%B3%A1%E4%B8%8E%E4%BA%8B%E4%BB%B6%E6%8D%95%E8%8E%B7.html" data-v-b9eb50cb><span class="desc" data-v-b9eb50cb>Next page</span><span class="title" data-v-b9eb50cb>一文读懂事件冒泡与事件捕获</span></a></div></div></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-6305e88a data-v-58542612><div class="container" data-v-58542612><p class="message" data-v-58542612>Released under the MIT License.</p><p class="copyright" data-v-58542612>Copyright © 2019-present Ziu Chen</p></div></footer><!--[--><!--]--></div></div>
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