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                                <h1 id="html-dom-document-&#x5BF9;&#x8C61;">HTML DOM Document &#x5BF9;&#x8C61;</h1>
<h4 id="&#x7ED9;&#x6587;&#x6863;&#x5BF9;&#x8C61;&#x6DFB;&#x52A0;&#x79FB;&#x9664;&#x4E8B;&#x4EF6;&#x53E5;&#x67C4;">&#x7ED9;&#x6587;&#x6863;&#x5BF9;&#x8C61;&#x6DFB;&#x52A0;/&#x79FB;&#x9664;&#x4E8B;&#x4EF6;&#x53E5;&#x67C4;</h4>
<pre><code class="lang-jsx"><span class="hljs-keyword">let</span> btnEnter = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;btnEnter&apos;</span>);
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">btn</span>(<span class="hljs-params"></span>)</span>{
  alert(<span class="hljs-string">&apos;&#x5355;&#x51FB;&#x4E8B;&#x4EF6;,&#x88AB;&#x89E6;&#x53D1;&apos;</span>);
}
</code></pre>
<pre><code class="lang-jsx"><span class="hljs-comment">/*
# addEventListener: &#x7ED9;&#x6587;&#x6863;&#x5BF9;&#x8C61;&#x6DFB;&#x52A0;&#x4E8B;&#x4EF6;&#x53E5;&#x67C4;
# &#x8BED;&#x6CD5;: document.addEventListener(event,function,useCapture)
# event: &#x5FC5;&#x9700;&#x3002;&#x63CF;&#x8FF0;&#x4E8B;&#x4EF6;&#x540D;&#x79F0;&#x7684;&#x5B57;&#x7B26;&#x4E32;&#x3002;
# function: &#x5FC5;&#x9700;&#x3002;&#x63CF;&#x8FF0;&#x4E86;&#x4E8B;&#x4EF6;&#x89E6;&#x53D1;&#x540E;&#x6267;&#x884C;&#x7684;&#x51FD;&#x6570;&#x3002; 
# useCapture: &#x53EF;&#x9009;:
#             true - &#x4E8B;&#x4EF6;&#x53E5;&#x67C4;&#x5728;&#x6355;&#x83B7;&#x9636;&#x6BB5;&#x6267;&#x884C;
#             false- &#x9ED8;&#x8BA4;&#x3002;&#x4E8B;&#x4EF6;&#x53E5;&#x67C4;&#x5728;&#x5192;&#x6CE1;&#x9636;&#x6BB5;&#x6267;&#x884C;
*/</span>
btnEnter.addEventListener(<span class="hljs-string">&apos;click&apos;</span>,btn())
<span class="hljs-comment">/*&#x60A8;&#x53EF;&#x4EE5;&#x901A;&#x8FC7;&#x51FD;&#x6570;&#x540D;&#x6765;&#x5F15;&#x7528;&#x5916;&#x90E8;&#x51FD;&#x6570;&#xFF1A;*/</span>
<span class="hljs-built_in">document</span>.addEventListener(<span class="hljs-string">&quot;click&quot;</span>, myFunction);
<span class="hljs-function"><span class="hljs-keyword">function</span> <span class="hljs-title">myFunction</span>(<span class="hljs-params"></span>) </span>{
  <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&quot;demo&quot;</span>).innerHTML = <span class="hljs-string">&quot;Hello World&quot;</span>;
}
</code></pre>
<pre><code class="lang-jsx"><span class="hljs-comment">/*
# reamveEventListener: &#x79FB;&#x9664;&#x6587;&#x6863;&#x4E2D;&#x7684;&#x4E8B;&#x4EF6;&#x53E5;&#x67C4;
# &#x8BED;&#x6CD5;: document.remaveEventListener(event,function,useCapture)
# event: &#x5FC5;&#x9700;&#x3002;&#x8981;&#x79FB;&#x9664;&#x7684;&#x4E8B;&#x4EF6;&#x540D;&#x79F0;&#x3002;
# function: &#x5FC5;&#x9700;&#x3002;&#x6307;&#x5B9A;&#x8981;&#x79FB;&#x9664;&#x7684;&#x51FD;&#x6570;&#x3002;
# useCapture: &#x53EF;&#x9009;:
#             true - &#x4E8B;&#x4EF6;&#x53E5;&#x67C4;&#x5728;&#x6355;&#x83B7;&#x9636;&#x6BB5;&#x79FB;&#x9664;
#             false- &#x9ED8;&#x8BA4;&#x3002;&#x4E8B;&#x4EF6;&#x53E5;&#x67C4;&#x5728;&#x5192;&#x6CE1;&#x9636;&#x6BB5;&#x79FB;&#x9664;
*/</span>
<span class="hljs-comment">// removeEventListener</span>
<span class="hljs-comment">// &#x79FB;&#x9664;&#x6587;&#x6863;&#x5BF9;&#x8C61;&#x5DF2;&#x6DFB;&#x52A0;&#x7684;&#x4E8B;&#x4EF6;&#x53E5;&#x67C4;</span>
btnEnter.removeEventListener(<span class="hljs-string">&apos;click&apos;</span>,btn())
</code></pre>
<h4 id="&#x8FD4;&#x56DE;&#x5F53;&#x524D;&#x83B7;&#x53D6;&#x7126;&#x70B9;&#x5143;&#x7D20;">&#x8FD4;&#x56DE;&#x5F53;&#x524D;&#x83B7;&#x53D6;&#x7126;&#x70B9;&#x5143;&#x7D20;</h4>
<p>&#x8BED;&#x6CD5;: doucment.activeElement.tagName<br>
&#x5B9A;&#x4E49;&#x548C;&#x4F7F;&#x7528;:
  activeElement &#x5C5E;&#x6027;&#x8FD4;&#x56DE;&#x6587;&#x6863;&#x4E2D;&#x5F53;&#x524D;&#x83B7;&#x5F97;&#x7126;&#x70B9;&#x7684;&#x5143;&#x7D20;&#x3002;</p>
<pre><code class="lang-html"><span class="hljs-tag">&lt;<span class="hljs-name">div</span> <span class="hljs-attr">id</span>=<span class="hljs-string">&quot;btns&quot;</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">input</span> <span class="hljs-attr">type</span>=<span class="hljs-string">&quot;text&quot;</span> <span class="hljs-attr">id</span>=<span class="hljs-string">&quot;name&quot;</span>&gt;</span>
  <span class="hljs-tag">&lt;<span class="hljs-name">button</span> <span class="hljs-attr">id</span>=<span class="hljs-string">&quot;btnName&quot;</span>&gt;</span>btnName<span class="hljs-tag">&lt;/<span class="hljs-name">button</span>&gt;</span>
<span class="hljs-tag">&lt;/<span class="hljs-name">div</span>&gt;</span>
</code></pre>
<pre><code class="lang-jsx"><span class="hljs-keyword">let</span> name = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;name&apos;</span>);
<span class="hljs-keyword">let</span> btnName = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;btnName&apos;</span>);
<span class="hljs-keyword">let</span> btns = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;btns&apos;</span>);
</code></pre>
<p>&#x7528;&#x6CD5;&#x4E00;(&#x83B7;&#x53D6;&#x5B50;&#x5143;&#x7D20;&#x7126;&#x70B9;&#x4E8B;&#x4EF6;&#x540D;&#x79F0;):</p>
<pre><code class="lang-jsx">btnS.addEventListener(<span class="hljs-string">&apos;click&apos;</span>,<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-built_in">document</span>.activeElement.tagName) <span class="hljs-comment">// &#x8F93;&#x51FA;&#x6240;&#x6709;&#x5B50;&#x5143;&#x7D20;&#x7684;&#x7126;&#x70B9;&#x4E8B;&#x4EF6;&#x540D;&#x79F0;</span>
})
</code></pre>
<p>&#x7528;&#x6CD5;&#x4E8C;(&#x5143;&#x7D20;&#x672C;&#x8EAB;&#x7684;&#x7126;&#x70B9;&#x4E8B;&#x4EF6;&#x540D;&#x79F0;):</p>
<pre><code class="lang-jsx">name.addEventListener(<span class="hljs-string">&apos;click&apos;</span>,<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>{
  <span class="hljs-built_in">console</span>.log(<span class="hljs-built_in">document</span>.activeElement.tagName);
})
</code></pre>
<h4 id="&#x3000;&#x6DFB;&#x52A0;class&#x5C5E;&#x6027;">&#x3000;&#x6DFB;&#x52A0;class&#x5C5E;&#x6027;</h4>
<pre><code class="lang-jsx"><span class="hljs-comment">// &#x6DFB;&#x52A0;class&#x5C5E;&#x6027;</span>
pater1.setAttribute(<span class="hljs-string">&quot;class&quot;</span>, <span class="hljs-string">&quot;redtext&quot;</span>);
<span class="hljs-comment">// &#x83B7;&#x53D6;class&#x5C5E;&#x6027; :&#x53EA;&#x5BF9; ID &#x6709;&#x6548;&#xFF0C;class&#x65E0;&#x6548;</span>
<span class="hljs-keyword">let</span> href = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;href&apos;</span>);
<span class="hljs-built_in">console</span>.log(href.getAttribute(<span class="hljs-string">&apos;href&apos;</span>));
</code></pre>

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