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has-sidebar" id="VPContent" data-v-dc294264 data-v-9bf49efd><div class="VPDoc has-sidebar has-aside" data-v-9bf49efd data-v-97779966><!--[--><!--]--><div class="container" data-v-97779966><div class="aside" data-v-97779966><div class="aside-curtain" data-v-97779966></div><div class="aside-container" data-v-97779966><div class="aside-content" data-v-97779966><div class="VPDocAside" data-v-97779966 data-v-c03c78a1><!--[--><!--]--><!--[--><!--]--><nav aria-labelledby="doc-outline-aria-label" class="VPDocAsideOutline" data-v-c03c78a1 data-v-951eb1c9><div class="content" data-v-951eb1c9><div class="outline-marker" data-v-951eb1c9></div><div aria-level="2" class="outline-title" id="doc-outline-aria-label" role="heading" data-v-951eb1c9>On this page</div><ul class="VPDocOutlineItem root" data-v-951eb1c9 data-v-317754ad><!--[--><!--]--></ul></div></nav><!--[--><!--]--><div class="spacer" data-v-c03c78a1></div><!--[--><!--]--><!----><!--[--><!--]--><!--[--><!--]--></div></div></div></div><div class="content" data-v-97779966><div class="content-container" data-v-97779966><!--[--><!--]--><main class="main" data-v-97779966><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-97779966><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 vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> () {</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> var</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (b </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 5</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">);</span></span>
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||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">})();</span></span>
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||
<span class="line"></span>
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||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(b);</span></span>
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||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(a);</span></span></code></pre></div><p>结果为：</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span>5</span></span>
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<span class="line"><span>Error</span></span></code></pre></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 vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">1</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> +</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> '2'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">1</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> -</span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;"> '2'</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span></code></pre></div><p>结果为：</p><div class="language-js vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">12</span></span>
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<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">-</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">1</span></span></code></pre></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 vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">var</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 1</span></span>
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||
<span class="line"></span>
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||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">setTimeout</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> () {</span></span>
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||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 2</span></span>
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||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(a)</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
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<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">var</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> a</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(a)</span></span>
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||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 3</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(a)</span></span></code></pre></div><p>结果为：</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span>1</span></span>
|
||
<span class="line"><span>3</span></span>
|
||
<span class="line"><span>2</span></span></code></pre></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 vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> f</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> f</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">new</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> f</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">() </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">instanceof</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> f</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span></code></pre></div><p>结果为：</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span>false</span></span></code></pre></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 vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">var</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> foo </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> bar</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">: </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> () {</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> this</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">.baz</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> },</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> baz: </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">1</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">typeof</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (f </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> foo.bar)())</span></span></code></pre></div><p>结果为：</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span>undefined</span></span></code></pre></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 vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">var</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> (b </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, c </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 2</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(a, b, c)</span></span></code></pre></div><p>结果为：</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span>2 1 2</span></span></code></pre></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 vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">var</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> company </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> address: </span><span style="--shiki-light:#032F62;--shiki-dark:#9ECBFF;">'beijing'</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">var</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> jjworld </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> Object.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">create</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(company)</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">delete</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> jjworld.address</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(jjworld.address)</span></span></code></pre></div><p>结果为：</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span>beijing</span></span></code></pre></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 vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> side</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">arr</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> arr[</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">0</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">] </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> arr[</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">2</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">]</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">function</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> a</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">a</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">b</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#E36209;--shiki-dark:#FFAB70;">c</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> =</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 3</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) {</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> c </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">=</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> 10</span></span>
|
||
<span class="line"><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;"> side</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">arguments</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">)</span></span>
|
||
<span class="line"><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;"> return</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> a </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">+</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> b </span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">+</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> c</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">}</span></span>
|
||
<span class="line"></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">a</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">, </span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;">1</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">))</span></span></code></pre></div><p>结果为：</p><div class="language- vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang"></span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span>12</span></span></code></pre></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 vp-adaptive-theme"><button title="Copy Code" class="copy"></button><span class="lang">js</span><pre class="shiki shiki-themes github-light github-dark vp-code" tabindex="0"><code><span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">typeof</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> []) </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// object</span></span>
|
||
<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">typeof</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;"> {}) </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// object</span></span>
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<span class="line"><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">console.</span><span style="--shiki-light:#6F42C1;--shiki-dark:#B392F0;">log</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">(</span><span style="--shiki-light:#D73A49;--shiki-dark:#F97583;">typeof</span><span style="--shiki-light:#005CC5;--shiki-dark:#79B8FF;"> null</span><span style="--shiki-light:#24292E;--shiki-dark:#E1E4E8;">) </span><span style="--shiki-light:#6A737D;--shiki-dark:#6A737D;">// object</span></span></code></pre></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-97779966 data-v-00e73594><!--[--><!--]--><div class="edit-info" data-v-00e73594><div class="edit-link" data-v-00e73594><a class="VPLink link vp-external-link-icon no-icon edit-link-button" href="https://github.com/ZiuChen/ZiuChen.github.io/edit/main/docs/article/【用友金融】前端面试题总结.md" target="_blank" rel="noreferrer" data-v-00e73594><!--[--><span class="vpi-square-pen edit-link-icon" data-v-00e73594></span> Edit this page on GitHub<!--]--></a></div><div class="last-updated" data-v-00e73594><p class="VPLastUpdated" data-v-00e73594 data-v-9c9bd9f9>Updated Date: <time datetime="2024-11-19T05:08:19.000Z" data-v-9c9bd9f9></time></p></div></div><nav class="prev-next" aria-labelledby="doc-footer-aria-label" data-v-00e73594><span class="visually-hidden" id="doc-footer-aria-label" data-v-00e73594>Pager</span><div class="pager" data-v-00e73594><a class="VPLink link 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-00e73594><!--[--><span class="desc" data-v-00e73594>Previous page</span><span class="title" data-v-00e73594>【快手】深入理解前端面试题</span><!--]--></a></div><div class="pager" data-v-00e73594><a class="VPLink link 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-00e73594><!--[--><span class="desc" data-v-00e73594>Next page</span><span class="title" data-v-00e73594>一文读懂事件冒泡与事件捕获</span><!--]--></a></div></nav></footer><!--[--><!--]--></div></div></div><!--[--><!--]--></div></div><footer class="VPFooter has-sidebar" data-v-dc294264 data-v-fce9f0d0><div class="container" data-v-fce9f0d0><p class="message" data-v-fce9f0d0>Released under the MIT License.</p><p class="copyright" data-v-fce9f0d0>Copyright © 2022-PRESENT ZiuChen</p></div></footer><!--[--><!--]--></div></div>
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