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                                <h1 id="javascript&#x4E8B;&#x4EF6;&#x6D41;">JavaScript&#x4E8B;&#x4EF6;&#x6D41;</h1>
<h2 id="&#x5B9A;&#x4E49;">&#x5B9A;&#x4E49;</h2>
<blockquote>
<p>&#x7533;&#x660E;&#xFF1A;&#x672C;&#x6587;&#x4EC5;&#x9650;&#x79C1;&#x4EBA;&#x5B66;&#x4E60;&#x4E4B;&#x7528;---- <a href="http://www.cnblogs.com/blackwood/archive/2013/03/14/2959195.html" target="_blank">&#x539F;&#x6587;</a>&#xFF1B;</p>
<p>&#x4E0B;&#x56FE;&#x5C55;&#x793A;&#x4E86;&#x5B8C;&#x6574;&#x7684;js&#x4E8B;&#x4EF6;&#x6D41;</p>
</blockquote>
<p><img src="http://images.cnblogs.com/cnblogs_com/blackwood/416364/o_eventpic.jpg"></p>
<h4 id="&#x6355;&#x83B7;&#x9636;&#x6BB5;&#xFF1A;documentelementhtmlelementbodyelementdiv">&#x6355;&#x83B7;&#x9636;&#x6BB5;&#xFF1A;Document==&gt;ElementHtml==&gt;ElementBody==&gt;ElementDiv</h4>
<h4 id="&#x5192;&#x6CE1;&#x9636;&#x6BB5;&#xFF1A;elementdivelementbodyelementhtmldocument">&#x5192;&#x6CE1;&#x9636;&#x6BB5;&#xFF1A;ElementDiv==&gt;ElementBody==&gt;ElementHtml==&gt;Document</h4>
<h2 id="&#x5206;&#x6790;">&#x5206;&#x6790;</h2>
<blockquote>
<h4 id="&#x6355;&#x83B7;&#x9636;&#x6BB5;&#xFF1A;">&#x6355;&#x83B7;&#x9636;&#x6BB5;&#xFF1A;</h4>
<p>document&#x5BF9;&#x8C61;&#x9996;&#x5148;&#x63A5;&#x6536;&#x5230;click&#x4E8B;&#x4EF6;&#xFF0C;&#x7136;&#x540E;&#x4E8B;&#x4EF6;&#x6CBF;DOM&#x6811;&#x4F9D;&#x6B21;&#x5411;&#x4E0B;&#xFF0C;&#x4E00;&#x76F4;&#x4F20;&#x64AD;&#x5230;&#x4E8B;&#x4EF6;&#x7684;&#x5B9E;&#x9645;&#x76EE;&#x6807;&#x3002;<br></p>
<h4 id="&#x5192;&#x6CE1;&#x9636;&#x6BB5;&#xFF1A;">&#x5192;&#x6CE1;&#x9636;&#x6BB5;&#xFF1A;</h4>
<p>IE&#x7684;&#x4E8B;&#x4EF6;&#x6D41;&#x53EB;&#x505A;&#x4E8B;&#x4EF6;&#x5192;&#x6CE1;&#xFF08;event bubbling&#xFF09;&#xFF0C;&#x5373;&#x4E8B;&#x4EF6;&#x5F00;&#x59CB;&#x65F6;&#x7531;&#x6700;&#x5177;&#x4F53;&#x7684;&#x5143;&#x7D20;&#xFF08;&#x6587;&#x6863;&#x4E2D;&#x5D4C;&#x5957;&#x5C42;&#x6B21;&#x6700;&#x6DF1;&#x7684;&#x90A3;&#x4E2A;&#x8282;&#x70B9;&#xFF09;&#x63A5;&#x6536;&#xFF0C;&#x7136;&#x540E;&#x9010;&#x7EA7;&#x5411;&#x4E0A;&#x4F20;&#x64AD;&#x5230;&#x8F83;&#x4E3A;&#x4E0D;&#x5177;&#x4F53;&#x7684;&#x8282;&#x70B9;&#xFF08; &#x6587;&#x6863;&#xFF09;&#x3002;</p>
</blockquote>
<h2 id="&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;">&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;</h2>
<h3 id="html&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;">html&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;</h3>
<blockquote>
<h4 id="&#x4E8B;&#x4EF6;&#x5BF9;&#x8C61;&#xFF1A;">&#x4E8B;&#x4EF6;&#x5BF9;&#x8C61;&#xFF1A;</h4>
<pre><code>event:&#x4E0D;&#x662F;&#x81EA;&#x5DF1;&#x5B9A;&#x4E49;&#x7684;&#xFF0C;&#x662F;&#x7D66;&#x5143;&#x7D20;&#x7D81;&#x5B9A;&#x4E8B;&#x4EF6;&#x4E4B;&#x540E;&#xFF0C;&#x81EA;&#x52A8;&#x751F;&#x6210;&#x7684;&#x5C40;&#x90E8;&#x53D8;&#x91CF;&#xFF0C;&#x8868;&#x793A;&#x4E8B;&#x4EF6;&#x5BF9;&#x8C61;&#x3002;
this:&#x5728;&#x51FD;&#x6578;&#x5167;&#x90E8;&#xFF0C;&#x7B49;&#x4E8E;&#x4E8B;&#x4EF6;&#x7684;&#x76EE;&#x6807;&#x5143;&#x7D20;&#xFF1B;&#x5728;&#x51FD;&#x6578;&#x5167;&#x90E8;&#x53EF;&#x4EE5;&#x50CF;&#x8BBF;&#x95EE;&#x5C40;&#x90E8;&#x53D8;&#x91CF;&#x4E00;&#x6837;&#x8BBF;&#x95EE;document&#x53CA;&#x8BE5;&#x5143;&#x7D20;&#x672C;&#x8EAB;&#x7684;&#x6210;&#x5458;&#x3002;
</code></pre><pre><code class="lang-js"><span class="hljs-comment">//&#x5982;&#x679C;&#x5F53;&#x524D;&#x5143;&#x7D20;&#x662F;&#x4E00;&#x500B;&#x8868;&#x5355;&#x7684;&#x8F38;&#x5165;&#x5143;&#x7D20;&#xFF0C;&#x5219;&#x4F5C;&#x7528;&#x57DF;&#x4E2D;&#x8FD8;&#x4F1A;&#x5305;&#x542B;&#x8BBF;&#x95EE;&#x8868;&#x5355;&#x5143;&#x7D20;&#xFF08;&#x7236;&#x5143;&#x7D20;&#xFF09;&#x7684;&#x5165;&#x53E3;</span>
(<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>{
   <span class="hljs-keyword">with</span>(<span class="hljs-built_in">document</span>){
     <span class="hljs-keyword">with</span>(<span class="hljs-keyword">this</span>.from){
       <span class="hljs-comment">//&#x5143;&#x7D20;&#x5C5E;&#x6027;&#x503C;</span>
     }
   }
 })()
</code></pre>
</blockquote>
<h4 id="&#x7F3A;&#x70B9;&#xFF1A;">&#x7F3A;&#x70B9;&#xFF1A;</h4>
<pre><code>1.&#x65F6;&#x5DEE;&#x95EE;&#x9898;&#xFF0C;&#x7528;&#x6236;&#x53EF;&#x80FD;&#x4F1A;&#x5728;HTML&#x5143;&#x7D20;&#x4E00;&#x51FA;&#x73FE;&#x5728;&#x9875;&#x9762;&#x4E0A;&#x65F6;&#xFF0C;&#x5C31;&#x89E6;&#x53D1;&#x76F8;&#x5E94;&#x4E8B;&#x4EF6;&#xFF0C;&#x4F46;&#x5F53;&#x65F6;&#x8BE5;&#x4E8B;&#x4EF6;&#x6709;&#x53EF;&#x80FD;&#x4E0D;&#x5177;&#x5907;&#x6267;&#x884C;&#x6761;&#x4EF6;&#x3002;
2.&#x8FD9;&#x6837;&#x6269;&#x5C55;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x7684;&#x4F5C;&#x7528;&#x57DF;&#x94FE;&#x5728;&#x4E0D;&#x540C;&#x6D4F;&#x89C8;&#x5668;&#x4E2D;&#x4F1A;&#x5BFC;&#x81F4;&#x4E0D;&#x540C;&#x7ED3;&#x679C;&#x3002;&#x4E0D;&#x540C;JavaScript&#x5F15;&#x64CE;&#x9075;&#x5FAA;&#x7684;&#x6807;&#x8BC6;&#x7B26;&#x89E3;&#x6790;&#x89C4;&#x5219;&#x7565;&#x6709;&#x5DEE;&#x5F02;&#xFF0C;&#x5F88;&#x53EF;&#x80FD;&#x4F1A;&#x5728;&#x8BBF;&#x95EE;&#x975E;&#x9650;&#x5B9A;&#x5BF9;&#x8C61;&#x6210;&#x5458;&#x65F6;&#x51FA;&#x9519;&#x3002;(&#x9AD8;&#x8026;&#x5408;)
</code></pre><h3 id="dom0&#x7EA7;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;">DOM0&#x7EA7;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;</h3>
<blockquote>
<p>&#x901A;&#x8FC7;js&#x6307;&#x5B9A;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x7684;&#x4F20;&#x7EDF;&#x65B9;&#x5F0F;&#xFF0C;&#x5C31;&#x662F;&#x5C06;&#x4E00;&#x4E2A;&#x51FD;&#x6570;&#x8D4B;&#x503C;&#x7ED9;&#x4E00;&#x4E2A;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x5C5E;&#x6027;</p>
<pre><code class="lang-js"><span class="hljs-comment">//&#x521B;&#x5EFA;</span>
<span class="hljs-keyword">var</span> btn = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&quot;myBtn&quot;</span>);
btn.onclick=<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>{
  alert(<span class="hljs-string">&quot;Clicked&quot;</span>);
}
<span class="hljs-comment">//&#x5220;&#x9664;</span>
btn.onclick=<span class="hljs-literal">null</span>;
</code></pre>
</blockquote>
<h3 id="dom2&#x7EA7;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;">DOM2&#x7EA7;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;</h3>
<h4 id="addeventlistener">addEventListener()</h4>
<blockquote>
<p>&#x4E3A;&#x6307;&#x5B9A;&#x4E8B;&#x4EF6;&#x6DFB;&#x52A0;&#x5904;&#x7406;&#x7A0B;&#x5E8F;</p>
<pre><code class="lang-js"><span class="hljs-comment">// &#x4E0B;&#x9762;&#x8FD9;&#x6BB5;&#x7A0B;&#x5E8F;&#x4E2D;&#x56E0;&#x4E3A;&#x6DFB;&#x52A0;&#x4E86;false&#xFF0C;&#x6240;&#x4EE5;&#x8BE5;&#x4E8B;&#x4EF6;&#x4F1A;&#x5728;&#x5192;&#x6CE1;&#x9636;&#x6BB5;&#x88AB;&#x89E6;&#x53D1;</span>
<span class="hljs-keyword">var</span> btn=<span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&apos;myBtn&apos;</span>);
btn.addEventListener(<span class="hljs-string">&quot;click&quot;</span>,<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>{
  alert(<span class="hljs-string">&quot;this.id&quot;</span>);
},<span class="hljs-literal">false</span>);
<span class="hljs-comment">// &#x4F7F;&#x7528; DOM2 &#x7EA7;&#x65B9;&#x6CD5;&#x6DFB;&#x52A0;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x7684;&#x4E3B;&#x8981;&#x597D;&#x5904;&#x662F;&#x53EF;&#x4EE5;&#x6DFB;&#x52A0;&#x591A;&#x4E2A;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x3002;</span>
<span class="hljs-comment">// &#x8FD9;&#x4E24;&#x4E2A;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x4F1A;&#x6309;&#x7167;&#x6DFB;&#x52A0;&#x5B83;&#x4EEC;&#x7684;&#x987A;&#x5E8F;&#x89E6;&#x53D1;&#xFF0C;&#x56E0;&#x6B64;&#x9996;&#x5148;&#x4F1A;&#x663E;&#x793A;&#x5143;&#x7D20;&#x7684;ID&#xFF0C;&#x5176;&#x6B21;&#x4F1A;&#x663E;&#x793A;&quot; Hello world!&quot; &#x6D88;&#x606F;&#x3002;</span>
<span class="hljs-keyword">var</span> btn=<span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&quot;myBtn&quot;</span>);
btn.addEventListener(<span class="hljs-string">&quot;click&quot;</span>,<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>{
  alert(<span class="hljs-string">&quot;this.id&quot;</span>)
},<span class="hljs-literal">false</span>);
btn.addEventListener(<span class="hljs-string">&quot;click&quot;</span>,<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>{
  alert(<span class="hljs-string">&quot;Hello World&#xFF01;&quot;</span>)
},<span class="hljs-literal">false</span>);
</code></pre>
</blockquote>
<h4 id="removeeventlistener">removeEventListener()</h4>
<blockquote>
<p>&#x5220;&#x9664;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;</p>
<pre><code class="lang-js"><span class="hljs-comment">// &#x4E0B;&#x9762;&#x8FD9;&#x4E2A;&#x51FD;&#x6570;&#xFF0C;&#x867D;&#x7136;&#x770B;&#x8D77;&#x6765;&#x5408;&#x4E4E;&#x903B;&#x8F91;&#xFF0C;&#x4F46;&#x662F;removeEventListener&#x6E05;&#x9664;&#x7684;&#x7A0B;&#x5E8F;&#x4E0E;addEventListener&#x7ED1;&#x5B9A;&#x7684;&#x4E8B;&#x4EF6;&#x4E0D;&#x662F;&#x540C;&#x4E00;&#x4E2A;</span>
<span class="hljs-keyword">var</span> btn=<span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&quot;myBtn&quot;</span>);
btn.addEventListener(<span class="hljs-string">&quot;click&quot;</span>,<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>{
  alert(<span class="hljs-string">&quot;Hello World&#xFF01;&quot;</span>)
},<span class="hljs-literal">false</span>);
btn.removeEventListener(<span class="hljs-string">&quot;click&quot;</span>,<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>{
  alert(<span class="hljs-string">&quot;Hello World!&quot;</span>);
})
<span class="hljs-comment">// &#x6211;&#x4EEC;&#x5728;&#x8FD9;&#x91CC;&#x7528;&#x53E6;&#x4E00;&#x4E2A;&#x4F8B;&#x5B50;&#x6765;&#x8868;&#x73B0;,&#x8FD9;&#x4E2A;&#x4F8B;&#x5B50;&#x4E2D;&#x7ED1;&#x5B9A;&#x4E8B;&#x4EF6;&#x7A0B;&#x5E8F;&#x4E0E;&#x5220;&#x9664;&#x4E8B;&#x4EF6;&#x7A0B;&#x5E8F;&#x4F7F;&#x7528;&#x4E86;&#x76F8;&#x540C;&#x7684;&#x51FD;&#x6570;</span>
<span class="hljs-keyword">var</span> btn=<span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&quot;myBtn&quot;</span>);
<span class="hljs-keyword">var</span> handler = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  alert(<span class="hljs-keyword">this</span>.id);
}
btn.addEventListener(<span class="hljs-string">&quot;click&quot;</span>,handler,<span class="hljs-literal">false</span>);
btn.removeEventListener(<span class="hljs-string">&quot;click&quot;</span>,handler,<span class="hljs-literal">false</span>);
</code></pre>
</blockquote>
<h3 id="&#x5EFA;&#x8BAE;">&#x5EFA;&#x8BAE;</h3>
<blockquote>
<p>&#x5927;&#x591A;&#x6570;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x90FD;&#x662F;&#x5C06;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x6DFB;&#x52A0;&#x5230;&#x4E8B;&#x4EF6;&#x6D41;&#x7684;&#x5192;&#x6CE1;&#x9636;&#x6BB5;&#xFF0C;&#x8FD9;&#x6837;&#x53EF;&#x4EE5;&#x6700;&#x5927;&#x9650;&#x5EA6;&#x5730;&#x517C;&#x5BB9;&#x5404;&#x79CD;&#x6D4F;&#x89C8;&#x5668;&#x3002;&#x6700;&#x597D;&#x53EA;&#x5728;&#x9700;&#x8981;&#x5728;&#x4E8B;&#x4EF6;&#x5230;&#x8FBE;&#x76EE;&#x6807;&#x4E4B;&#x524D;&#x622A;&#x83B7;&#x5B83;&#x7684;&#x65F6;&#x5019;&#x5C06;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x6DFB;&#x52A0;&#x5230;&#x6355;&#x83B7;&#x9636;&#x6BB5;&#x3002;&#x5982;&#x679C;&#x4E0D;&#x662F;&#x7279;&#x522B;&#x9700;&#x8981;&#xFF0C;&#x6211;&#x4EEC;&#x4E0D;&#x5EFA;&#x8BAE;&#x5728;&#x4E8B;&#x4EF6;&#x6355;&#x83B7;&#x9636;&#x6BB5;&#x6CE8;&#x518C;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x3002;</p>
</blockquote>
<h2 id="ie&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;">IE&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;</h2>
<blockquote>
<p>IE&#x5B9E;&#x73B0;&#x4E86;&#x4E0E;DOM&#x4E2D;&#x7C7B;&#x4F3C;&#x7684;&#x4E24;&#x4E2A;&#x65B9;&#x6CD5;&#xFF1A;attachEvent()&#x548C;detachEvent()&#x3002;&#x8FD9;&#x4E24;&#x4E2A;&#x65B9;&#x6CD5;&#x63A5;&#x53D7;&#x76F8;&#x540C;&#x7684;&#x4E24;&#x4E2A;&#x53C2;&#x6570;&#xFF1A;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x540D;&#x79F0;&#x4E0E;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x51FD;&#x6570;&#x3002;&#x7531;&#x4E8E;IE8&#x53CA;&#x66F4;&#x65E9;&#x7248;&#x672C;&#x53EA;&#x652F;&#x6301;&#x4E8B;&#x4EF6;&#x5192;&#x6CE1;&#xFF0C;&#x6240;&#x4EE5;&#x901A;&#x8FC7;attachEvent()&#x6DFB;&#x52A0;&#x7684;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x90FD;&#x4F1A;&#x88AB;&#x6DFB;&#x52A0;&#x5230;&#x5192;&#x6CE1;&#x9636;&#x6BB5;&#x3002;</p>
</blockquote>
<h3 id="attachevent">attachEvent()</h3>
<pre><code class="lang-js"><span class="hljs-comment">// &#x4E0B;&#x9762;&#x8FD9;&#x4E2A;&#x4F8B;&#x5B50;&#x4E2D; &#x4E8B;&#x4EF6;&#x7ED1;&#x5B9A; &#x65F6; ,&#x7B2C;&#x4E00;&#x4E2A;&#x53C2;&#x6570;&#x7528;&#x7684;&#x662F; onclick&#xFF0C;IE&#x4F7F;&#x7528;attachEvent()&#x4E0E;&#x4F7F;&#x7528;DOM0&#x65B9;&#x6CD5;&#x7684;&#x4E3B;&#x8981;&#x533A;&#x522B;&#x5728;&#x4E8E;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x7684;&#x4F5C;&#x7528;&#x57DF;&#x3002;</span>
<span class="hljs-keyword">var</span> btn=<span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&quot;MyBtn&quot;</span>);
btn.attachEvent(<span class="hljs-string">&quot;onclick&quot;</span>,<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>{
  alert(<span class="hljs-string">&quot;Clicked&quot;</span>);
})
<span class="hljs-comment">// &#x5728;DOM0&#x7EA7;&#x65B9;&#x6CD5;&#x7684;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x4F1A;&#x5728;&#x5176;&#x6240;&#x5C5E;&#x5143;&#x7D20;&#x7684;&#x4F5C;&#x7528;&#x57DF;&#x5185;&#x8FD0;&#x884C;&#xFF1B;&#x5728;&#x4F7F;&#x7528;attachEvent()&#x65B9;&#x6CD5;&#x7684;&#x60C5;&#x51B5;&#x4E0B;&#xFF0C;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x4F1A;&#x5728; &#x5168;&#x5C40;&#x4F5C;&#x7528;&#x57DF;&#x4E2D;&#x8FD0;&#x884C;&#xFF0C;&#x56E0;&#x6B64;this&#x7B49;&#x4E8E;windows&#x3002;</span>
<span class="hljs-keyword">var</span> btn =<span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&quot;myBtn&quot;</span>);
btn.attachEvent(<span class="hljs-string">&quot;onclick&quot;</span>,<span class="hljs-function"><span class="hljs-keyword">function</span>(<span class="hljs-params"></span>)</span>{
  alert(<span class="hljs-keyword">this</span>===<span class="hljs-built_in">window</span>);<span class="hljs-comment">//true</span>
})
<span class="hljs-comment">// &#x6DFB;&#x52A0;&#x591A;&#x4E2A;&#x5143;&#x7D20;&#x7684;&#x65B9;&#x6CD5;</span>
<span class="hljs-keyword">var</span> btn = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&quot;myBtn&quot;</span>);
<span class="hljs-keyword">var</span> handler=<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>)</span>{
  alert(<span class="hljs-string">&quot;Hello World!&quot;</span>)
}
<span class="hljs-keyword">var</span> hello=<span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>)</span>{
  alert(<span class="hljs-string">&quot;hello&quot;</span>);
}
btn.attachEvent(<span class="hljs-string">&quot;onclick&quot;</span>,handler);
btn.attachEvent(<span class="hljs-string">&quot;onclick&quot;</span>,hello);
<span class="hljs-comment">// &#x6267;&#x884C;&#x987A;&#x5E8F;:&#x591A;&#x4E8B;&#x4EF6;&#x7ED1;&#x5B9A;&#xFF0C;&#x6267;&#x884C;&#x987A;&#x5E8F;&#x662F;&#x4EE5;&#x5012;&#x5E8F;&#x7684;&#x65B9;&#x5F0F;&#x6267;&#x884C;&#x7684;&#x3002;</span>
<span class="hljs-comment">// hello</span>
<span class="hljs-comment">// Hello World!</span>
</code></pre>
<h3 id="detachevent">detachEvent()</h3>
<pre><code class="lang-js"><span class="hljs-comment">// &#x79FB;&#x9664;attachEvent&#x6DFB;&#x52A0;&#x7684;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x7A0B;&#x5E8F;</span>
<span class="hljs-keyword">var</span> btn = <span class="hljs-built_in">document</span>.getElementById(<span class="hljs-string">&quot;myBtn&quot;</span>);
<span class="hljs-keyword">var</span> handler = <span class="hljs-function"><span class="hljs-keyword">function</span> (<span class="hljs-params"></span>) </span>{
  alert(<span class="hljs-string">&apos;Clicked&apos;</span>);
}
btn.attachEvent(<span class="hljs-string">&quot;onclick&quot;</span>,handler);
btn.detachEvent(<span class="hljs-string">&quot;onclick&quot;</span>,handler);
</code></pre>
<h2 id="&#x8DE8;&#x6D4F;&#x89C8;&#x5668;&#x7684;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;">&#x8DE8;&#x6D4F;&#x89C8;&#x5668;&#x7684;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;</h2>
<h3 id="addhandlerremovehandler">addHandler()|removeHandler()</h3>
<blockquote>
<p>&#x8FD9;2&#x4E2A;&#x65B9;&#x6CD5;&#x5C5E;&#x4E8E;&#x4E00;&#x4E2A;&#x540D;&#x53EB;EventUtil&#x7684;&#x5BF9;&#x8C61;<br>
&#x53C2;&#x6570;&#xFF1A;&#x8981;&#x64CD;&#x4F5C;&#x7684;&#x5143;&#x7D20; | &#x4E8B;&#x4EF6;&#x540D;&#x79F0; | &#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x63A5;&#x53D7;&#x7A0B;&#x5E8F;
```js
// &#x89E3;&#x6790;&#xFF1A;&#x9996;&#x5148;&#x5224;&#x65AD;&#x662F;&#x5426;&#x5B58;&#x5728;DOM2&#x7EA7;&#x65B9;&#x6CD5;&#xFF0C;&#x5982;&#x679C;&#x5B58;&#x5728;==&gt;&#x4F20;&#x5165;&#x4E8B;&#x4EF6;&#x7C7B;&#x578B;&#xFF0C;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x51FD;&#x6570;&#xFF0C;&#x548C;&#x7B2C;&#x4E09;&#x4E2A;&#x53C2;&#x6570;&#x65B9;&#x6CD5;false&#xFF08;&#x8868;&#x793A;&#x5192;&#x6CE1;&#x9636;&#x6BB5;&#xFF09;&#xFF0C;&#x5982;&#x679C;&#x5B58;&#x5728;&#x7684;&#x662F;IE&#x7684;&#x65B9;&#x6CD5;&#xFF0C;&#x5C31;&#x91C7;&#x7528;&#x7B2C;&#x4E8C;&#x79CD;&#x65B9;&#x6CD5;&#xFF0C;&#x4E3A;&#x4E86;&#x517C;&#x5BB9;IE8&#x53CA;&#x8DDF;&#x65E9;&#x7684;&#x7248;&#x672C;&#xFF0C;&#x6B64;&#x65F6;&#x7684;&#x65F6;&#x95F4;&#x7C7B;&#x578B;&#x5FC5;&#x987B;&#x52A0;&#x4E0A;&quot;on&quot;&#x524D;&#x7F00;&#x3002;&#x6700;&#x540E;&#x4E00;&#x79CD;&#x662F;DOm0&#x7EA7;&#x65B9;&#x6CD5;(&#x73B0;&#x4EE3;&#x6D4F;&#x89C8;&#x5668;&#xFF0C;&#x4E00;&#x822C;&#x4E0D;&#x4F1A;&#x6267;&#x884C;&#x8FD9;&#x91CC;&#x7684;&#x4EE3;&#x7801;)&#xFF0C;&#x4F7F;&#x7528;&#x65B9;&#x62EC;&#x53F7;&#x8BED;&#x6CD5;&#x5C06;&#x5C5E;&#x6027;&#x540D;&#x6307;&#x5B9A;&#x4E3A;&#x4E8B;&#x4EF6;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x6216;&#x8005;&#x5C06;&#x5C5E;&#x6027;&#x8BBE;&#x7F6E;&#x4E3A;null&#xFF1B;</p>
</blockquote>
<p>var EventUtil={
  addHandler:function(element,type,handler){
    if(element.addEventListener){
      element.addEventListener(type,handler,false);
    }else if(element.attachEvent){
      element.attachEvent(&quot;on&quot; + type,handler);
    }else {
      element[&quot;on&quot; + type] = handler;
    }
  },
  removeHandler:function(element,type,handler){
    if(element.removeEventListener){
      element.removeEventListener(element,type,false);
    }else if(element.detachEvent){
      element.detachEvent(&quot;on&quot;+type,handler);
    }else{
      element[&quot;on&quot;+type]=null;
    }
  }
}
// &#x5B9E;&#x4F8B;&#xFF1A;&#x4F7F;&#x7528;EventUtil&#x5BF9;&#x8C61;==&gt;&#x7ED1;&#x5B9A;click&#x4E8B;&#x4EF6;&#x5E76;&#x5220;&#x9664;click&#x4E8B;&#x4EF6;
// &#x5206;&#x6790;&#xFF1A;&#x7531;&#x4E8E;addHandler&#x548C;removeHandler&#x6CA1;&#x6709;&#x8003;&#x8651;&#x5230;&#x6240;&#x6709;&#x6D4F;&#x89C8;&#x5668;&#x7684;&#x95EE;&#x9898;&#xFF0C;&#x4F8B;&#x5982;IE&#x6D4F;&#x89C8;&#x5668;&#x4E2D;&#x7684;&#x4F5C;&#x7528;&#x57DF;&#x7684;&#x95EE;&#x9898;&#xFF0C;&#x6240;&#x4EE5;&#x6211;&#x4EEC;&#x5F80;&#x5F80;&#x53EA;&#x7528;&#x4F5C;&#x6DFB;&#x52A0;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x6216;&#x8005;&#x79FB;&#x9664;&#x5904;&#x7406;&#x7A0B;&#x5E8F;&#x3002;
//&#x63D0;&#x793A;&#xFF1A;&#x53EA;DoM0&#x7EA7;&#x7684;&#x6D4F;&#x89C8;&#x5668;&#x5DF2;&#x7ECF;&#x4E0D;&#x591A;&#x4E86;&#xFF0C;&#x6240;&#x4EE5;&#x9700;&#x8981;&#x6CE8;&#x610F;&#x7684;&#x95EE;&#x9898;&#x4E0D;&#x662F;&#x5F88;&#x591A;
var btn = document.getElementById(&quot;myBtn&quot;);
var handler = function (){
  alert(&quot;&#x4F60;&#x597D;&#xFF01;&quot;);
}
EventUtil.addHandler(btn,&quot;click&quot;,handler);
EventUtil.removeHandler(btn,&quot;click&quot;,handler);
```</p>

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