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---
title: MediaStream.getTracks()
slug: Web/API/MediaStream/getTracks
tags:
- 参考
- 媒体流
- 媒体流 API
- 媒体轨道
- 方法
translation_of: Web/API/MediaStream/getTracks
---
<p>{{APIRef("Media Capture and Streams")}}{{SeeCompatTable}}</p>
<p>{{domxref("MediaStream")}} 接口的<strong><dfn><code>getTracks()</code></dfn></strong> 方法会返回一个包含 <code><a href="https://www.w3.org/TR/mediacapture-streams/#track-set">track set</a></code> 流中所有 {{domxref("MediaStreamTrack")}} 对象的序列， 序列内容与{{domxref("MediaStreamTrack.kind")}} 无关。</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox">var <em>mediaStreamTracks</em> = <em>mediaStream</em>.getTracks()</pre>
<h3 id="参数">参数</h3>
<p>无</p>
<h3 id="返回值">返回值</h3>
<p>{{domxref("MediaStreamTrack")}} 对象的数组</p>
<h2 id="示例">示例</h2>
<pre class="brush: js">navigator.mediaDevices.getUserMedia({audio: false, video: true})
.then(mediaStream => {
document.querySelector('video').srcObject = mediaStream;
// Stop the stream after 5 seconds
setTimeout(() => {
const tracks = mediaStream.getTracks()
tracks[0].stop()
}, 5000)
})</pre>
<h2 id="说明">说明</h2>
<table class="standard-table">
<thead>
<tr>
<th scope="col">说明</th>
<th scope="col">状态</th>
<th scope="col">评论</th>
</tr>
</thead>
<tbody>
<tr>
<td>{{SpecName('Media Capture','#dom-mediastream-gettracks','getTracks()')}}</td>
<td>{{Spec2('Media Capture')}}</td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器支持情况">浏览器支持情况</h2>
<div class="hidden">
<p>The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> and send us a pull request.</p>
</div>
<p>{{Compat("api.MediaStream.getTracks")}}</p>
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