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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/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%E5%AD%97%E8%8A%82%E8%B7%B3%E5%8A%A8%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="【字节跳动】前端面试题总结" tabindex="-1">【字节跳动】前端面试题总结 <a class="header-anchor" href="#【字节跳动】前端面试题总结" aria-label="Permalink to "【字节跳动】前端面试题总结""></a></h1><h2 id="看代码说结果" tabindex="-1">看代码说结果 <a class="header-anchor" href="#看代码说结果" aria-label="Permalink to "看代码说结果""></a></h2><h3 id="代码输出结果1" tabindex="-1">代码输出结果1 <a class="header-anchor" href="#代码输出结果1" aria-label="Permalink to "代码输出结果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;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">([</span><span style="color:#89DDFF;">'</span><span style="color:#C3E88D;">1</span><span style="color:#89DDFF;">'</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:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">'</span><span style="color:#C3E88D;">3</span><span style="color:#89DDFF;">'</span><span style="color:#A6ACCD;">]</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">map</span><span style="color:#A6ACCD;">(parseInt))</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><div class="language- 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, NaN, NaN]</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="代码输出结果2" tabindex="-1">代码输出结果2 <a class="header-anchor" href="#代码输出结果2" aria-label="Permalink to "代码输出结果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:#C792EA;">let</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">[</span><span style="color:#A6ACCD;">a </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;"> b</span><span style="color:#89DDFF;">]</span><span style="color:#A6ACCD;"> </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;">(a</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> b)</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- 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 undefined</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="代码输出结果3" tabindex="-1">代码输出结果3 <a class="header-anchor" href="#代码输出结果3" aria-label="Permalink to "代码输出结果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:#FFCB6B;">Promise</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">resolve</span><span style="color:#A6ACCD;">()</span></span>
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<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">then</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">()</span><span style="color:#A6ACCD;"> </span><span style="color:#C792EA;">=></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:#FFCB6B;">Promise</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">resolve</span><span style="color:#F07178;">()</span></span>
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<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">then</span><span style="color:#F07178;">(</span><span style="color:#89DDFF;">()</span><span style="color:#F07178;"> </span><span style="color:#C792EA;">=></span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">{</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:#F78C6C;">1</span><span style="color:#F07178;">)</span></span>
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<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">}</span><span style="color:#F07178;">)</span></span>
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<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">then</span><span style="color:#F07178;">(</span><span style="color:#89DDFF;">()</span><span style="color:#F07178;"> </span><span style="color:#C792EA;">=></span><span style="color:#F07178;"> </span><span style="color:#89DDFF;">{</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:#F78C6C;">2</span><span style="color:#F07178;">)</span></span>
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<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">}</span><span style="color:#F07178;">)</span></span>
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<span class="line"><span style="color:#F07178;"> </span><span style="color:#89DDFF;">}</span><span style="color:#A6ACCD;">)</span></span>
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<span class="line"><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">then</span><span style="color:#A6ACCD;">(</span><span style="color:#89DDFF;">()</span><span style="color:#A6ACCD;"> </span><span style="color:#C792EA;">=></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;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#F07178;">(</span><span style="color:#F78C6C;">3</span><span style="color:#F07178;">)</span></span>
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<span class="line"><span style="color:#F07178;"> </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><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><div class="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 3 2</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="代码输出结果4" tabindex="-1">代码输出结果4 <a class="header-anchor" href="#代码输出结果4" aria-label="Permalink to "代码输出结果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;">const</span><span style="color:#A6ACCD;"> obj </span><span style="color:#89DDFF;">=</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 style="color:#C3E88D;">3</span><span style="color:#89DDFF;">'</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">2</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">2</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:#89DDFF;">'</span><span style="color:#C3E88D;">1</span><span style="color:#89DDFF;">'</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#F07178;">name</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">'</span><span style="color:#C3E88D;">name</span><span style="color:#89DDFF;">'</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#F07178;">age</span><span style="color:#89DDFF;">:</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">'</span><span style="color:#C3E88D;">age</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;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">(Object</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">keys</span><span style="color:#A6ACCD;">(obj))</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- 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', '2', '3', 'name', 'age']</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="代码输出结果5" tabindex="-1">代码输出结果5 <a class="header-anchor" href="#代码输出结果5" aria-label="Permalink to "代码输出结果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;">let</span><span style="color:#A6ACCD;"> myArray </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;">myArray[</span><span style="color:#89DDFF;">'</span><span style="color:#C3E88D;">0</span><span style="color:#89DDFF;">'</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;">a</span><span style="color:#89DDFF;">'</span></span>
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||
<span class="line"><span style="color:#A6ACCD;">myArray[</span><span style="color:#89DDFF;">'</span><span style="color:#C3E88D;">1</span><span style="color:#89DDFF;">'</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;">b</span><span style="color:#89DDFF;">'</span></span>
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||
<span class="line"><span style="color:#A6ACCD;">myArray</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">length </span><span style="color:#89DDFF;">=</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">2</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;">...</span><span style="color:#A6ACCD;">myArray)</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><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;"></span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="代码输出结果6" tabindex="-1">代码输出结果6 <a class="header-anchor" href="#代码输出结果6" aria-label="Permalink to "代码输出结果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:#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:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">2</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:#F78C6C;">4</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">5</span><span style="color:#A6ACCD;">]</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">splice</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;">2</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:#F78C6C;">4</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">5</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:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">2</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:#F78C6C;">4</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">5</span><span style="color:#A6ACCD;">]</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">slice</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;">2</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:#F78C6C;">4</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#F78C6C;">5</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><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, 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></div></div><h3 id="代码输出结果7" tabindex="-1">代码输出结果7 <a class="header-anchor" href="#代码输出结果7" aria-label="Permalink to "代码输出结果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:#A6ACCD;">console</span><span style="color:#89DDFF;">.</span><span style="color:#82AAFF;">log</span><span style="color:#A6ACCD;">([]</span><span style="color:#89DDFF;">.</span><span style="color:#A6ACCD;">constructor </span><span style="color:#89DDFF;">===</span><span style="color:#A6ACCD;"> Array)</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;">===</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">'</span><span style="color:#C3E88D;">array</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:#89DDFF;">typeof</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">null</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;">object</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:#89DDFF;">''</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">instanceof</span><span style="color:#A6ACCD;"> </span><span style="color:#FFCB6B;">Object</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></div></div><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;">true</span></span>
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<span class="line"><span style="color:#A6ACCD;">false</span></span>
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<span class="line"><span style="color:#A6ACCD;">true</span></span>
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<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><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><h2 id="问答题" tabindex="-1">问答题 <a class="header-anchor" href="#问答题" aria-label="Permalink to "问答题""></a></h2><h3 id="http缓存的请求头与响应头有哪些" tabindex="-1">HTTP缓存的请求头与响应头有哪些 <a class="header-anchor" href="#http缓存的请求头与响应头有哪些" aria-label="Permalink to "HTTP缓存的请求头与响应头有哪些""></a></h3><ul><li>强制缓存 <ul><li>响应头: Expires 与 Cache-Control</li><li>Expires 绝对时间</li><li>Cache-Control 相对时间</li></ul></li><li>协商缓存 <ul><li>响应头: Etag 请求头: If-Non-Match</li><li>响应头: Last-Modified 请求头: If-Modified-Since</li></ul></li></ul><h3 id="宏任务与微任务有哪些区别-简述他们的应用场景" tabindex="-1">宏任务与微任务有哪些区别？简述他们的应用场景 <a class="header-anchor" href="#宏任务与微任务有哪些区别-简述他们的应用场景" aria-label="Permalink to "宏任务与微任务有哪些区别？简述他们的应用场景""></a></h3><p>宏任务与微任务优先级不同</p><ul><li>先执行同步代码，后执行异步代码</li><li>主线程代码执行完毕后，检查微任务队列是否为空，非空则优先执行微任务</li><li>每次执行宏任务之前，都会检查微任务队列是否为空，非空则优先执行微任务</li></ul><p>常见的宏任务与微任务</p><ul><li>宏任务 <code>script</code> <code>setTimeout</code> <code>setInterval</code> <code>postMessage</code> <code>MessageChannel</code> <code>setImmediate (NodeJS)</code></li><li>微任务 <code>Promise.then</code> <code>Object.observe</code> <code>MutationObserver</code> <code>process.nextTick (NodeJS)</code></li></ul><h2 id="算法" tabindex="-1">算法 <a class="header-anchor" href="#算法" aria-label="Permalink to "算法""></a></h2><p>中文数字转为阿拉伯数字</p><p>给定一个字符串，返回该字符串的所有组合</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;">输入 abc </span></span>
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<span class="line"><span style="color:#A6ACCD;">输出 [</span><span style="color:#89DDFF;">'</span><span style="color:#C3E88D;">abc</span><span style="color:#89DDFF;">'</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">'</span><span style="color:#C3E88D;">acb</span><span style="color:#89DDFF;">'</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">'</span><span style="color:#C3E88D;">bac</span><span style="color:#89DDFF;">'</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">'</span><span style="color:#C3E88D;">bca</span><span style="color:#89DDFF;">'</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">'</span><span style="color:#C3E88D;">cab</span><span style="color:#89DDFF;">'</span><span style="color:#89DDFF;">,</span><span style="color:#A6ACCD;"> </span><span style="color:#89DDFF;">'</span><span style="color:#C3E88D;">cba</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>回溯算法</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/【字节跳动】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="2023-04-27T09:14:36.000Z" 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%902023%E3%80%91%E9%9D%92%E8%AE%AD%E8%90%A5%20-%20%E5%89%8D%E7%AB%AF%E7%BB%83%E4%B9%A0%E9%A2%98%E6%B1%87%E6%80%BB%E8%A7%A3%E6%9E%90.html" data-v-b9eb50cb><span class="desc" data-v-b9eb50cb>Previous page</span><span class="title" data-v-b9eb50cb>【2023】青训营 - 前端练习题汇总解析</span></a></div><div class="has-prev pager" data-v-b9eb50cb><a class="pager-link next" 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>Next page</span><span class="title" data-v-b9eb50cb>【快手】深入理解前端面试题</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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