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+---
+title: EventTarget
+slug: Web/API/EventTarget
+tags:
+  - API
+  - DOM
+  - DOM Events
+  - Interface
+translation_of: Web/API/EventTarget
+---
+<p>{{ApiRef("DOM Events")}}</p>
+
+<p><code>EventTarget</code> 是一个 DOM 接口，由可以接收事件、并且可以创建侦听器的对象实现。</p>
+
+<p>{{domxref("Element")}}，{{domxref("document")}} 和 {{domxref("window")}} 是最常见的 event targets ，但是其他对象也可以作为 event targets，比如 {{domxref("XMLHttpRequest")}}，{{domxref("AudioNode")}}，{{domxref("AudioContext")}}  等等。</p>
+
+<p>许多 event targets （包括 elements， documents 和 windows）支持通过 <code>onevent</code> 特性和属性设置<a href="/zh-CN/docs/Web/Guide/DOM/Events/Event_handlers">事件处理程序</a> (<a href="https://wiki.developer.mozilla.org/en-US/docs/Web/Guide/DOM/Events/Event_handlers">event handlers</a>)。</p>
+
+<p>{{InheritanceDiagram}}</p>
+
+<h2 id="构造函数">构造函数</h2>
+
+<dl>
+ <dt>{{domxref("EventTarget.EventTarget()","EventTarget()")}}</dt>
+ <dd>创建一个新的 <code>EventTarget</code> 对象实例。</dd>
+</dl>
+
+<h2 id="Methods" name="Methods">方法</h2>
+
+<dl>
+ <dt>{{domxref("EventTarget.addEventListener()")}}</dt>
+ <dd>在EventTarget上注册特定事件类型的事件处理程序。</dd>
+ <dt>{{domxref("EventTarget.removeEventListener()")}}</dt>
+ <dd>EventTarget中删除事件侦听器。</dd>
+ <dt>{{domxref("EventTarget.dispatchEvent()")}}</dt>
+ <dd>将事件分派到此EventTarget。</dd>
+</dl>
+
+<h3 id="Mozilla_chrome_代码的其他方法">Mozilla chrome 代码的其他方法</h3>
+
+<p>Mozilla扩展，供JS实现的事件目标使用以 实现 on* 属性。另见 <a href="https://developer.mozilla.org/en-US/docs/Mozilla/WebIDL_bindings">WebIDL bindings</a> 绑定。</p>
+
+<ul>
+ <li>void <strong>setEventHandler</strong>(DOMString type, EventHandler handler) {{non-standard_inline}}</li>
+ <li>EventHandler <strong>getEventHandler</strong>(DOMString type) {{non-standard_inline}}</li>
+</ul>
+
+<h2 id="示例">示例</h2>
+
+<h3 id="EventTarget_的简单实现">EventTarget 的简单实现</h3>
+
+<pre class="brush: js">var EventTarget = function() {
+  this.listeners = {};
+};
+
+EventTarget.prototype.listeners = null;
+EventTarget.prototype.addEventListener = function(type, callback) {
+  if(!(type in this.listeners)) {
+    this.listeners[type] = [];
+  }
+  this.listeners[type].push(callback);
+};
+
+EventTarget.prototype.removeEventListener = function(type, callback) {
+  if(!(type in this.listeners)) {
+    return;
+  }
+  var stack = this.listeners[type];
+  for(var i = 0, l = stack.length; i &lt; l; i++) {
+    if(stack[i] === callback){
+      stack.splice(i, 1);
+      return this.removeEventListener(type, callback);
+    }
+  }
+};
+
+EventTarget.prototype.dispatchEvent = function(event) {
+  if(!(event.type in this.listeners)) {
+    return;
+  }
+  var stack = this.listeners[event.type];
+  event.target = this;
+  for(var i = 0, l = stack.length; i &lt; l; i++) {
+      stack[i].call(this, event);
+  }
+};
+</pre>
+
+<h2 id="Specification" name="Specification">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">注释</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('DOM WHATWG', '#interface-eventtarget', 'EventTarget')}}</td>
+   <td>{{Spec2('DOM WHATWG')}}</td>
+   <td>No change.</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('DOM3 Events', 'DOM3-Events.html#interface-EventTarget', 'EventTarget')}}</td>
+   <td>{{Spec2('DOM3 Events')}}</td>
+   <td>A few parameters are now optional (<code>listener</code>), or accepts the <code>null</code> value (<code>useCapture</code>).</td>
+  </tr>
+  <tr>
+   <td>{{SpecName('DOM2 Events', 'events.html#Events-EventTarget', 'EventTarget')}}</td>
+   <td>{{Spec2('DOM2 Events')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_Compatibility" name="Browser_Compatibility">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.EventTarget")}}</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/Reference/Events">Event reference</a> - the events available in the platform.</li>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/Guide/DOM/Events">Event developer guide</a></li>
+ <li>{{domxref("Event")}} interface</li>
+</ul>