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---
title: 'HTMLMediaElement: durationchange 事件'
slug: Web/API/HTMLMediaElement/durationchange_event
tags:
- Audio
- Event
- HTMLMe
- HTMLMediaElement
- Reference
- Video
translation_of: Web/API/HTMLMediaElement/durationchange_event
---
<p>{{APIRef("HTMLMediaElement")}}</p>
<p><span class="seoSummary"><code>durationchange</code> 事件会在 <code>duration</code> 属性更新时被触发。</span></p>
<table class="properties">
<tbody>
<tr>
<th scope="row">Bubbles</th>
<td>No</td>
</tr>
<tr>
<th scope="row">Cancelable</th>
<td>No</td>
</tr>
<tr>
<th scope="row">Interface</th>
<td>{{DOMxRef("Event")}}</td>
</tr>
<tr>
<th scope="row">Target</th>
<td>Element</td>
</tr>
<tr>
<th scope="row">Default Action</th>
<td>None</td>
</tr>
<tr>
<th scope="row">Event handler property</th>
<td>{{domxref("GlobalEventHandlers.ondurationchange")}}</td>
</tr>
<tr>
<th scope="row">Specification</th>
<td><a class="external" href="http://www.whatwg.org/specs/web-apps/current-work/multipage/the-video-element.html#event-media-playing">HTML5 media</a></td>
</tr>
</tbody>
</table>
<h2 id="例子">例子</h2>
<p>下面的例子为 HTMLMediaElement 的 <code>durationchange</code> 事件添加事件监听器，然后在事件触发时发送一个消息。</p>
<p>使用 <code>addEventListener()</code>:</p>
<pre class="brush: js notranslate">const video = document.querySelector('video');
video.addEventListener('durationchange', (event) => {
console.log('Not sure why, but the duration of the video has changed.');
});</pre>
<p>使用 <code>ondurationchange</code> 事件处理器属性：</p>
<pre class="brush: js notranslate">const video = document.querySelector('video');
video.ondurationchange = (event) => {
console.log('Not sure why, but the duration of the video has changed.');
};</pre>
<h2 id="Specifications">Specifications</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
</tr>
<tr>
<td>{{SpecName('HTML WHATWG', "media.html#event-media-durationchange", "durationchange media event")}}</td>
<td>{{Spec2('HTML WHATWG')}}</td>
</tr>
<tr>
<td>{{SpecName('HTML5 W3C', "embedded-content-0.html#event-media-durationchange", "durationchange media event")}}</td>
<td>{{Spec2('HTML5 W3C')}}</td>
</tr>
</tbody>
</table>
<h2 id="Browser_compatibility">Browser compatibility</h2>
<p>{{Compat("api.HTMLMediaElement.durationchange_event")}}</p>
<h2 id="Related_Events">Related Events</h2>
<ul>
<li>{{domxref("HTMLMediaElement.playing_event", 'HTMLMediaElement: playing event')}}</li>
<li>{{domxref("HTMLMediaElement.waiting_event", 'HTMLMediaElement: waiting event')}}</li>
<li>{{domxref("HTMLMediaElement.seeking_event", 'HTMLMediaElement: seeking event')}}</li>
<li>{{domxref("HTMLMediaElement.seeked_event", 'HTMLMediaElement: seeked event')}}</li>
<li>{{domxref("HTMLMediaElement.ended_event", 'HTMLMediaElement: ended event')}}</li>
<li>{{domxref("HTMLMediaElement.loadedmetadata_event", 'HTMLMediaElement: loadedmetadata event')}}</li>
<li>{{domxref("HTMLMediaElement.loadeddata_event", 'HTMLMediaElement: loadeddata event')}}</li>
<li>{{domxref("HTMLMediaElement.canplay_event", 'HTMLMediaElement: canplay event')}}</li>
<li>{{domxref("HTMLMediaElement.canplaythrough_event", 'HTMLMediaElement: canplaythrough event')}}</li>
<li>{{domxref("HTMLMediaElement.durationchange_event", 'HTMLMediaElement: durationchange event')}}</li>
<li>{{domxref("HTMLMediaElement.timeupdate_event", 'HTMLMediaElement: timeupdate event')}}</li>
<li>{{domxref("HTMLMediaElement.play_event", 'HTMLMediaElement: play event')}}</li>
<li>{{domxref("HTMLMediaElement.pause_event", 'HTMLMediaElement: pause event')}}</li>
<li>{{domxref("HTMLMediaElement.ratechange_event", 'HTMLMediaElement: ratechange event')}}</li>
<li>{{domxref("HTMLMediaElement.volumechange_event", 'HTMLMediaElement: volumechange event')}}</li>
<li>{{domxref("HTMLMediaElement.suspend_event", 'HTMLMediaElement: suspend event')}}</li>
<li>{{domxref("HTMLMediaElement.emptied_event", 'HTMLMediaElement: emptied event')}}</li>
<li>{{domxref("HTMLMediaElement.stalled_event", 'HTMLMediaElement: stalled event')}}</li>
</ul>
<h2 id="See_Also">See Also</h2>
<ul>
<li>{{domxref("HTMLAudioElement")}}</li>
<li>{{domxref("HTMLVideoElement")}}</li>
<li>{{HTMLElement("audio")}}</li>
<li>{{HTMLElement("video")}}</li>
</ul>
|
