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authorPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
committerPeter Bengtsson <mail@peterbe.com>2020-12-08 14:40:17 -0500
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+---
+title: Event.initEvent()
+slug: Web/API/Event/initEvent
+translation_of: Web/API/Event/initEvent
+---
+<div>{{ ApiRef("DOM") }}{{deprecated_header}}</div>
+
+<p><strong><code>Event.initEvent()</code></strong> 方法可以用来初始化由{{domxref("Document.createEvent()") }} 创建的 {{ domxref("event") }} 实例.</p>
+
+<p>用这种方式初始化事件必须是由 {{ domxref("Document.createEvent()") }} 方法创建的实例. 本方法必须在事件被触发之前调用(用{{ domxref("EventTarget.dispatchEvent()") }}调用).事件 一旦被调用, 便不再做其他任何事.</p>
+
+<div class="note">
+<p><strong>不建议再使用此方法(方法已经过时deprecated)</strong></p>
+
+<p>可以使用特定的event构造器函数, 比如 {{domxref("Event.Event", "Event()")}}. 该页有关于这些的更多信息 <a href="/en-US/docs/Web/Guide/Events/Creating_and_triggering_events">Creating and triggering events</a> .</p>
+</div>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre class="syntaxbox"><em>event</em>.initEvent(<em>type</em>, <em>bubbles</em>, <em>cancelable</em>);</pre>
+
+<dl>
+ <dt><em><code>type</code></em></dt>
+ <dd>一个 {{domxref("DOMString")}} 类型的字段,定义了事件的类型.</dd>
+ <dt><em><code>bubbles</code></em></dt>
+ <dd>一个 {{jsxref("Boolean")}} 值,决定是否事件是否应该向上冒泡. 一旦设置了这个值,只读属性{{ domxref("Event.bubbles") }}也会获取相应的值.</dd>
+ <dt><em><code>cancelable</code></em></dt>
+ <dd>一个 {{jsxref("Boolean")}} 值,决定该事件的默认动作是否可以被取消. 一旦设置了这个值, 只读属性 {{ domxref("Event.cancelable") }} 也会获取相应的值.</dd>
+</dl>
+
+<h2 id="Example" name="Example">范例</h2>
+
+<pre><code>// 创建事件.
+var event = document.createEvent('Event');
+</code>
+// 初始化一个点击事件,可以冒泡,无法被取消<code>
+event.initEvent('click', true, false);
+
+// 设置事件监听.
+elem.addEventListener('click', function (e) {
+ // e.target 就是监听事件目标元素
+}, false);
+
+// 触发事件监听
+elem.dispatchEvent(event);</code>
+</pre>
+
+<h2 id="规格">规格</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', '#dom-event-initevent','Event.initEvent()')}}</td>
+ <td>{{Spec2("DOM WHATWG")}}</td>
+ <td>From {{SpecName('DOM2 Events')}}, deprecated it, superseded by event constructors.</td>
+ </tr>
+ <tr>
+ <td>{{SpecName('DOM2 Events','##Events-Event-initEvent','Event.initEvent()')}}</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</h2>
+
+<p>{{ CompatibilityTable() }}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Firefox (Gecko)</th>
+ <th>Chrome</th>
+ <th>Edge</th>
+ <th>Internet Explorer</th>
+ <th>Opera</th>
+ <th>Safari</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{CompatVersionUnknown()}} [1]</td>
+ <td>{{CompatVersionUnknown()}}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{CompatVersionUnknown()}}</td>
+ <td>{{CompatVersionUnknown()}}</td>
+ <td>{{CompatVersionUnknown()}}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+ <tr>
+ <th>Feature</th>
+ <th>Firefox Mobile (Gecko)</th>
+ <th>Android</th>
+ <th>Edge</th>
+ <th>IE Mobile</th>
+ <th>Opera Mobile</th>
+ <th>Safari Mobile</th>
+ </tr>
+ <tr>
+ <td>Basic support</td>
+ <td>{{ CompatUnknown() }} [1]</td>
+ <td>{{ CompatUnknown() }}</td>
+ <td>{{CompatVersionUnknown}}</td>
+ <td>{{ CompatUnknown() }}</td>
+ <td>{{ CompatUnknown() }}</td>
+ <td>{{ CompatUnknown() }}</td>
+ </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] Before Firefox 17, a call to this method after the dispatching of the event raised an exception instead of doing nothing.</p>
+
+<h2 id="另见">另见</h2>
+
+<ul>
+ <li>The constructor to use instead of this deprecated method: {{domxref("Event.Event", "Event()")}}. More specific constructors can be used too.</li>
+</ul>