From 33058f2b292b3a581333bdfb21b8f671898c5060 Mon Sep 17 00:00:00 2001
From: Peter Bengtsson <mail@peterbe.com>
Date: Tue, 8 Dec 2020 14:40:17 -0500
Subject: initial commit

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+---
+title: HTMLMediaElement.audioTracks
+slug: Web/API/HTMLMediaElement/audioTracks
+translation_of: Web/API/HTMLMediaElement/audioTracks
+---
+<div>{{APIRef("HTML DOM")}}</div>
+
+<p> <strong><code>HTMLMediaElement.audioTracks</code></strong> 获得可用音频轨道的数量</p>
+
+<h2 id="Syntax" name="Syntax">语法</h2>
+
+<pre>audio|video.audioTracks</pre>
+
+<h2 id="返回值">返回值</h2>
+
+<p>AudioTrackList    对象 表示音频/视频的可用音频轨道</p>
+
+<h2 id="用例">用例</h2>
+
+<p>以audio标签为例</p>
+
+<pre class="brush: html">&lt;audio id='audio'&gt;&lt;/audio&gt;
+</pre>
+
+<p>调用</p>
+
+<pre>myVid=document.getElementById("audio");
+alert(<code>myVid.audioTracks</code>.length);</pre>
+
+<h2 id="参考文档">参考文档</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('HTML WHATWG', "the-video-element.html#htmlmediaelement", "HTMLMediaElement.audioTracks")}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td>No change from {{SpecName('HTML5 W3C')}}</td>
+  </tr>
+  <tr>
+   <td>
+    <p>{{SpecName('HTML5 W3C', "embedded-content-0.html#htmlmediaelement", "HTMLMediaElement.audioTracks")}}</p>
+   </td>
+   <td>{{Spec2('HTML5 W3C')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器支持">浏览器支持</h2>
+
+<p>{{ CompatibilityTable() }}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td><code>audioTracks</code> property</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatGeckoDesktop("33.0")}}[5]</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>Firefox OS (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td><code>audioTracks</code> property</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatGeckoMobile("33.0")}}[5]</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+   <td>{{CompatUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_Also" name="See_Also">还可以看看</h2>
+
+<ul>
+ <li>定义它的接口, {{domxref("HTMLMediaElement")}}.</li>
+</ul>
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