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+---
+title: EventTarget
+slug: Web/API/EventTarget
+tags:
+  - API
+  - DOM
+  - DOM Events
+  - Interface
+  - NeedsTranslation
+  - TopicStub
+  - 待翻譯
+translation_of: Web/API/EventTarget
+---
+<p>{{ ApiRef("DOM Events") }}</p>
+
+<p><strong><code>EventTarget</code></strong> 介面定義了其實作的物件具有接收事件的能力，也可能擁有處理事件的監聽器。</p>
+
+<p>除了最為常見的 {{domxref("Element")}}、{{domxref("Document")}} 與 {{domxref("Window")}} 繼承或實作了 <code>EventTarget</code> 介面之外，其它的物件還有 {{domxref("XMLHttpRequest")}}、{{domxref("AudioNode")}}、{{domxref("AudioContext")}}⋯等等。</p>
+
+<p>許多 <code>EventTarget</code>（包括 Element、Document 和 Window）除了透過 {{domxref("EventTarget.addEventListener()", "addEventListener()")}} 方法外，還可藉由 {{domxref("Document_Object_Model", "DOM")}} 物件的屬性（{{Glossary("property/JavaScript", "property")}}）或 <a href="/zh-TW/docs/Web/HTML/Element">HTML 元素</a>屬性（{{Glossary("attribute")}}）來設定<a href="/zh-TW/docs/Web/Guide/DOM/Events/Event_handlers">事件處理器</a>。</p>
+
+<p>{{InheritanceDiagram}}</p>
+
+<h2 id="方法" name="方法">方法</h2>
+
+<dl>
+ <dt>{{domxref("EventTarget.addEventListener()")}}</dt>
+ <dd>於 <code>EventTarget</code> 物件上註冊指定事件的監聽器。</dd>
+ <dt>{{domxref("EventTarget.removeEventListener()")}}</dt>
+ <dd>移除 <code>EventTarget</code> 物件上的指定事件監聽器。</dd>
+ <dt>{{domxref("EventTarget.dispatchEvent()")}}</dt>
+ <dd>對此 <code>EventTarget</code> 物件派送（dispatch）一個事件物件，也就是於此 <code>EventTarget</code> 物件上觸發一個指定的事件物件實體。</dd>
+</dl>
+
+<h3 id="Mozilla_chrome_code_的額外方法">Mozilla chrome code 的額外方法</h3>
+
+<p>Mozilla extensions for use by JS-implemented event targets to implement on* properties. See also <a href="/docs/Mozilla/WebIDL_bindings">WebIDL bindings</a>.</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="範例">範例</h2>
+
+<h3 id="_Simple_implementation_of_EventTarget" name="_Simple_implementation_of_EventTarget">Simple implementation of EventTarget</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;
+    }
+  }
+};
+
+EventTarget.prototype.dispatchEvent = function(event) {
+  if (!(event.type in this.listeners)) {
+    return true;
+  }
+  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);
+  }
+  return !event.defaultPrevented;
+};
+</pre>
+
+<p>{{ EmbedLiveSample('_Simple_implementation_of_EventTarget') }}</p>
+
+<h2 id="Specification" name="Specification">規範</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">Specification</th>
+   <th scope="col">Status</th>
+   <th scope="col">Comment</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">瀏覽器相容性</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari (WebKit)</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>1.0</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop("1")}}</td>
+   <td>9.0</td>
+   <td>7</td>
+   <td>1.0<sup>[1]</sup></td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Edge</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>1.0</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile("1")}}</td>
+   <td>9.0</td>
+   <td>6.0</td>
+   <td>1.0</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] <code>window.EventTarget</code> does not exist.</p>
+
+<h2 id="參見">參見</h2>
+
+<ul>
+ <li><a href="/docs/Web/Reference/Events">Event reference</a> - the events available in the platform.</li>
+ <li><a href="/docs/Web/Guide/DOM/Events">Event developer guide</a></li>
+ <li>{{domxref("Event")}} interface</li>
+</ul>