ZiuChen.github.io/assets/article_【字节跳动】前端面试题总结.md.429af843.js

import{_ as s,o as a,c as n,Q as l}from"./chunks/framework.eaa7ef56.js";const u=JSON.parse('{"title":"【字节跳动】前端面试题总结","description":"","frontmatter":{},"headers":[],"relativePath":"article/【字节跳动】前端面试题总结.md","filePath":"article/【字节跳动】前端面试题总结.md","lastUpdated":1700152426000}'),p={name:"article/【字节跳动】前端面试题总结.md"},o=l(`<h1 id="【字节跳动】前端面试题总结" tabindex="-1">【字节跳动】前端面试题总结 <a class="header-anchor" href="#【字节跳动】前端面试题总结" aria-label="Permalink to &quot;【字节跳动】前端面试题总结&quot;">​</a></h1><h2 id="看代码说结果" tabindex="-1">看代码说结果 <a class="header-anchor" href="#看代码说结果" aria-label="Permalink to &quot;看代码说结果&quot;">​</a></h2><h3 id="代码输出结果1" tabindex="-1">代码输出结果1 <a class="header-anchor" href="#代码输出结果1" aria-label="Permalink to &quot;代码输出结果1&quot;">​</a></h3><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">console.</span><span style="color:#B392F0;">log</span><span style="color:#E1E4E8;">([</span><span style="color:#9ECBFF;">&#39;1&#39;</span><span style="color:#E1E4E8;">, </span><span style="color:#9ECBFF;">&#39;2&#39;</span><span style="color:#E1E4E8;">, </span><span style="color:#9ECBFF;">&#39;3&#39;</span><span style="color:#E1E4E8;">].</span><span style="color:#B392F0;">map</span><span style="color:#E1E4E8;">(parseInt))</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">console.</span><span style="color:#6F42C1;">log</span><span style="color:#24292E;">([</span><span style="color:#032F62;">&#39;1&#39;</span><span style="color:#24292E;">, </span><span style="color:#032F62;">&#39;2&#39;</span><span style="color:#24292E;">, </span><span style="color:#032F62;">&#39;3&#39;</span><span style="color:#24292E;">].</span><span style="color:#6F42C1;">map</span><span style="color:#24292E;">(parseInt))</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">[1, NaN, NaN]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">[1, NaN, NaN]</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="代码输出结果2" tabindex="-1">代码输出结果2 <a class="header-anchor" href="#代码输出结果2" aria-label="Permalink to &quot;代码输出结果2&quot;">​</a></h3><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> [a </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">, b] </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> []</span></span>
<span class="line"><span style="color:#E1E4E8;">console.</span><span style="color:#B392F0;">log</span><span style="color:#E1E4E8;">(a, b)</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> [a </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">1</span><span style="color:#24292E;">, b] </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> []</span></span>
<span class="line"><span style="color:#24292E;">console.</span><span style="color:#6F42C1;">log</span><span style="color:#24292E;">(a, b)</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">1 undefined</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">1 undefined</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br></div></div><h3 id="代码输出结果3" tabindex="-1">代码输出结果3 <a class="header-anchor" href="#代码输出结果3" aria-label="Permalink to &quot;代码输出结果3&quot;">​</a></h3><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#79B8FF;">Promise</span><span style="color:#E1E4E8;">.</span><span style="color:#B392F0;">resolve</span><span style="color:#E1E4E8;">()</span></span>
<span class="line"><span style="color:#E1E4E8;">  .</span><span style="color:#B392F0;">then</span><span style="color:#E1E4E8;">(() </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> {</span></span>
<span class="line"><span style="color:#E1E4E8;">    </span><span style="color:#79B8FF;">Promise</span><span style="color:#E1E4E8;">.</span><span style="color:#B392F0;">resolve</span><span style="color:#E1E4E8;">()</span></span>
<span class="line"><span style="color:#E1E4E8;">      .</span><span style="color:#B392F0;">then</span><span style="color:#E1E4E8;">(() </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> {</span></span>
<span class="line"><span style="color:#E1E4E8;">        console.</span><span style="color:#B392F0;">log</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">)</span></span>
<span class="line"><span style="color:#E1E4E8;">      })</span></span>
<span class="line"><span style="color:#E1E4E8;">      .</span><span style="color:#B392F0;">then</span><span style="color:#E1E4E8;">(() </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> {</span></span>
<span class="line"><span style="color:#E1E4E8;">        console.</span><span style="color:#B392F0;">log</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">2</span><span style="color:#E1E4E8;">)</span></span>
<span class="line"><span style="color:#E1E4E8;">      })</span></span>
<span class="line"><span style="color:#E1E4E8;">  })</span></span>
<span class="line"><span style="color:#E1E4E8;">  .</span><span style="color:#B392F0;">then</span><span style="color:#E1E4E8;">(() </span><span style="color:#F97583;">=&gt;</span><span style="color:#E1E4E8;"> {</span></span>
<span class="line"><span style="color:#E1E4E8;">    console.</span><span style="color:#B392F0;">log</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">3</span><span style="color:#E1E4E8;">)</span></span>
<span class="line"><span style="color:#E1E4E8;">  })</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#005CC5;">Promise</span><span style="color:#24292E;">.</span><span style="color:#6F42C1;">resolve</span><span style="color:#24292E;">()</span></span>
<span class="line"><span style="color:#24292E;">  .</span><span style="color:#6F42C1;">then</span><span style="color:#24292E;">(() </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> {</span></span>
<span class="line"><span style="color:#24292E;">    </span><span style="color:#005CC5;">Promise</span><span style="color:#24292E;">.</span><span style="color:#6F42C1;">resolve</span><span style="color:#24292E;">()</span></span>
<span class="line"><span style="color:#24292E;">      .</span><span style="color:#6F42C1;">then</span><span style="color:#24292E;">(() </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> {</span></span>
<span class="line"><span style="color:#24292E;">        console.</span><span style="color:#6F42C1;">log</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">1</span><span style="color:#24292E;">)</span></span>
<span class="line"><span style="color:#24292E;">      })</span></span>
<span class="line"><span style="color:#24292E;">      .</span><span style="color:#6F42C1;">then</span><span style="color:#24292E;">(() </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> {</span></span>
<span class="line"><span style="color:#24292E;">        console.</span><span style="color:#6F42C1;">log</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">2</span><span style="color:#24292E;">)</span></span>
<span class="line"><span style="color:#24292E;">      })</span></span>
<span class="line"><span style="color:#24292E;">  })</span></span>
<span class="line"><span style="color:#24292E;">  .</span><span style="color:#6F42C1;">then</span><span style="color:#24292E;">(() </span><span style="color:#D73A49;">=&gt;</span><span style="color:#24292E;"> {</span></span>
<span class="line"><span style="color:#24292E;">    console.</span><span style="color:#6F42C1;">log</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">3</span><span style="color:#24292E;">)</span></span>
<span class="line"><span style="color:#24292E;">  })</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br><span class="line-number">5</span><br><span class="line-number">6</span><br><span class="line-number">7</span><br><span class="line-number">8</span><br><span class="line-number">9</span><br><span class="line-number">10</span><br><span class="line-number">11</span><br><span class="line-number">12</span><br><span class="line-number">13</span><br></div></div><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">1 3 2</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">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 &quot;代码输出结果4&quot;">​</a></h3><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">const</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">obj</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> { </span><span style="color:#79B8FF;">3</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">&#39;3&#39;</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">2</span><span style="color:#E1E4E8;">: </span><span style="color:#79B8FF;">2</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">: </span><span style="color:#9ECBFF;">&#39;1&#39;</span><span style="color:#E1E4E8;">, name: </span><span style="color:#9ECBFF;">&#39;name&#39;</span><span style="color:#E1E4E8;">, age: </span><span style="color:#9ECBFF;">&#39;age&#39;</span><span style="color:#E1E4E8;"> }</span></span>
<span class="line"><span style="color:#E1E4E8;">console.</span><span style="color:#B392F0;">log</span><span style="color:#E1E4E8;">(Object.</span><span style="color:#B392F0;">keys</span><span style="color:#E1E4E8;">(obj))</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">const</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">obj</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> { </span><span style="color:#005CC5;">3</span><span style="color:#24292E;">: </span><span style="color:#032F62;">&#39;3&#39;</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">2</span><span style="color:#24292E;">: </span><span style="color:#005CC5;">2</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">1</span><span style="color:#24292E;">: </span><span style="color:#032F62;">&#39;1&#39;</span><span style="color:#24292E;">, name: </span><span style="color:#032F62;">&#39;name&#39;</span><span style="color:#24292E;">, age: </span><span style="color:#032F62;">&#39;age&#39;</span><span style="color:#24292E;"> }</span></span>
<span class="line"><span style="color:#24292E;">console.</span><span style="color:#6F42C1;">log</span><span style="color:#24292E;">(Object.</span><span style="color:#6F42C1;">keys</span><span style="color:#24292E;">(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- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">[&#39;1&#39;, &#39;2&#39;, &#39;3&#39;, &#39;name&#39;, &#39;age&#39;]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">[&#39;1&#39;, &#39;2&#39;, &#39;3&#39;, &#39;name&#39;, &#39;age&#39;]</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 &quot;代码输出结果5&quot;">​</a></h3><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#F97583;">let</span><span style="color:#E1E4E8;"> myArray </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> {}</span></span>
<span class="line"><span style="color:#E1E4E8;">myArray[</span><span style="color:#9ECBFF;">&#39;0&#39;</span><span style="color:#E1E4E8;">] </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&#39;a&#39;</span></span>
<span class="line"><span style="color:#E1E4E8;">myArray[</span><span style="color:#9ECBFF;">&#39;1&#39;</span><span style="color:#E1E4E8;">] </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&#39;b&#39;</span></span>
<span class="line"><span style="color:#E1E4E8;">myArray.</span><span style="color:#79B8FF;">length</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">=</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">2</span></span>
<span class="line"><span style="color:#E1E4E8;">console.</span><span style="color:#B392F0;">log</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">...</span><span style="color:#E1E4E8;">myArray)</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#D73A49;">let</span><span style="color:#24292E;"> myArray </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> {}</span></span>
<span class="line"><span style="color:#24292E;">myArray[</span><span style="color:#032F62;">&#39;0&#39;</span><span style="color:#24292E;">] </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&#39;a&#39;</span></span>
<span class="line"><span style="color:#24292E;">myArray[</span><span style="color:#032F62;">&#39;1&#39;</span><span style="color:#24292E;">] </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&#39;b&#39;</span></span>
<span class="line"><span style="color:#24292E;">myArray.</span><span style="color:#005CC5;">length</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">=</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">2</span></span>
<span class="line"><span style="color:#24292E;">console.</span><span style="color:#6F42C1;">log</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">...</span><span style="color:#24292E;">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- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;"></span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;"></span></span></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 &quot;代码输出结果6&quot;">​</a></h3><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">console.</span><span style="color:#B392F0;">log</span><span style="color:#E1E4E8;">([</span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">2</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">3</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">4</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">5</span><span style="color:#E1E4E8;">].</span><span style="color:#B392F0;">splice</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">2</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">3</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">4</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">5</span><span style="color:#E1E4E8;">))</span></span>
<span class="line"><span style="color:#E1E4E8;">console.</span><span style="color:#B392F0;">log</span><span style="color:#E1E4E8;">([</span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">2</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">3</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">4</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">5</span><span style="color:#E1E4E8;">].</span><span style="color:#B392F0;">slice</span><span style="color:#E1E4E8;">(</span><span style="color:#79B8FF;">1</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">2</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">3</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">4</span><span style="color:#E1E4E8;">, </span><span style="color:#79B8FF;">5</span><span style="color:#E1E4E8;">))</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">console.</span><span style="color:#6F42C1;">log</span><span style="color:#24292E;">([</span><span style="color:#005CC5;">1</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">2</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">3</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">4</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">5</span><span style="color:#24292E;">].</span><span style="color:#6F42C1;">splice</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">1</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">2</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">3</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">4</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">5</span><span style="color:#24292E;">))</span></span>
<span class="line"><span style="color:#24292E;">console.</span><span style="color:#6F42C1;">log</span><span style="color:#24292E;">([</span><span style="color:#005CC5;">1</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">2</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">3</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">4</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">5</span><span style="color:#24292E;">].</span><span style="color:#6F42C1;">slice</span><span style="color:#24292E;">(</span><span style="color:#005CC5;">1</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">2</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">3</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">4</span><span style="color:#24292E;">, </span><span style="color:#005CC5;">5</span><span style="color:#24292E;">))</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">[2, 3]</span></span>
<span class="line"><span style="color:#e1e4e8;">[2]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">[2, 3]</span></span>
<span class="line"><span style="color:#24292e;">[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 &quot;代码输出结果7&quot;">​</a></h3><div class="language-js vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">console.</span><span style="color:#B392F0;">log</span><span style="color:#E1E4E8;">([].</span><span style="color:#79B8FF;">constructor</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">===</span><span style="color:#E1E4E8;"> Array)</span></span>
<span class="line"><span style="color:#E1E4E8;">console.</span><span style="color:#B392F0;">log</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">typeof</span><span style="color:#E1E4E8;"> [] </span><span style="color:#F97583;">===</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&#39;array&#39;</span><span style="color:#E1E4E8;">)</span></span>
<span class="line"><span style="color:#E1E4E8;">console.</span><span style="color:#B392F0;">log</span><span style="color:#E1E4E8;">(</span><span style="color:#F97583;">typeof</span><span style="color:#E1E4E8;"> </span><span style="color:#79B8FF;">null</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">===</span><span style="color:#E1E4E8;"> </span><span style="color:#9ECBFF;">&#39;object&#39;</span><span style="color:#E1E4E8;">)</span></span>
<span class="line"><span style="color:#E1E4E8;">console.</span><span style="color:#B392F0;">log</span><span style="color:#E1E4E8;">(</span><span style="color:#9ECBFF;">&#39;&#39;</span><span style="color:#E1E4E8;"> </span><span style="color:#F97583;">instanceof</span><span style="color:#E1E4E8;"> </span><span style="color:#B392F0;">Object</span><span style="color:#E1E4E8;">)</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">console.</span><span style="color:#6F42C1;">log</span><span style="color:#24292E;">([].</span><span style="color:#005CC5;">constructor</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">===</span><span style="color:#24292E;"> Array)</span></span>
<span class="line"><span style="color:#24292E;">console.</span><span style="color:#6F42C1;">log</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">typeof</span><span style="color:#24292E;"> [] </span><span style="color:#D73A49;">===</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&#39;array&#39;</span><span style="color:#24292E;">)</span></span>
<span class="line"><span style="color:#24292E;">console.</span><span style="color:#6F42C1;">log</span><span style="color:#24292E;">(</span><span style="color:#D73A49;">typeof</span><span style="color:#24292E;"> </span><span style="color:#005CC5;">null</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">===</span><span style="color:#24292E;"> </span><span style="color:#032F62;">&#39;object&#39;</span><span style="color:#24292E;">)</span></span>
<span class="line"><span style="color:#24292E;">console.</span><span style="color:#6F42C1;">log</span><span style="color:#24292E;">(</span><span style="color:#032F62;">&#39;&#39;</span><span style="color:#24292E;"> </span><span style="color:#D73A49;">instanceof</span><span style="color:#24292E;"> </span><span style="color:#6F42C1;">Object</span><span style="color:#24292E;">)</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br><span class="line-number">3</span><br><span class="line-number">4</span><br></div></div><div class="language- vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#e1e4e8;">true</span></span>
<span class="line"><span style="color:#e1e4e8;">false</span></span>
<span class="line"><span style="color:#e1e4e8;">true</span></span>
<span class="line"><span style="color:#e1e4e8;">false</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292e;">true</span></span>
<span class="line"><span style="color:#24292e;">false</span></span>
<span class="line"><span style="color:#24292e;">true</span></span>
<span class="line"><span style="color:#24292e;">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 &quot;问答题&quot;">​</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 &quot;HTTP缓存的请求头与响应头有哪些&quot;">​</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 &quot;宏任务与微任务有哪些区别？简述他们的应用场景&quot;">​</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 &quot;算法&quot;">​</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 vp-adaptive-theme line-numbers-mode"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki github-dark vp-code-dark"><code><span class="line"><span style="color:#E1E4E8;">输入 abc </span></span>
<span class="line"><span style="color:#E1E4E8;">输出 [</span><span style="color:#9ECBFF;">&#39;abc&#39;</span><span style="color:#E1E4E8;">, </span><span style="color:#9ECBFF;">&#39;acb&#39;</span><span style="color:#E1E4E8;">, </span><span style="color:#9ECBFF;">&#39;bac&#39;</span><span style="color:#E1E4E8;">, </span><span style="color:#9ECBFF;">&#39;bca&#39;</span><span style="color:#E1E4E8;">, </span><span style="color:#9ECBFF;">&#39;cab&#39;</span><span style="color:#E1E4E8;">, </span><span style="color:#9ECBFF;">&#39;cba&#39;</span><span style="color:#E1E4E8;">]</span></span></code></pre><pre class="shiki github-light vp-code-light"><code><span class="line"><span style="color:#24292E;">输入 abc </span></span>
<span class="line"><span style="color:#24292E;">输出 [</span><span style="color:#032F62;">&#39;abc&#39;</span><span style="color:#24292E;">, </span><span style="color:#032F62;">&#39;acb&#39;</span><span style="color:#24292E;">, </span><span style="color:#032F62;">&#39;bac&#39;</span><span style="color:#24292E;">, </span><span style="color:#032F62;">&#39;bca&#39;</span><span style="color:#24292E;">, </span><span style="color:#032F62;">&#39;cab&#39;</span><span style="color:#24292E;">, </span><span style="color:#032F62;">&#39;cba&#39;</span><span style="color:#24292E;">]</span></span></code></pre><div class="line-numbers-wrapper" aria-hidden="true"><span class="line-number">1</span><br><span class="line-number">2</span><br></div></div><p>回溯算法</p>`,36),e=[o];function c(r,t,y,E,i,d){return a(),n("div",null,e)}const h=s(p,[["render",c]]);export{u as __pageData,h as default};