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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 =&gt; {
+  document.querySelector('video').srcObject = mediaStream;
+  // Stop the stream after 5 seconds
+  setTimeout(() =&gt; {
+    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>