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+---
+title: MediaStreamTrack.getCapabilities()
+slug: Web/API/MediaStreamTrack/getCapabilities
+tags:
+  - API
+  - Media Capture and Streams API
+  - Media Streams API
+  - MediaStreamTrack
+  - getCapabilities
+  - 媒体API
+translation_of: Web/API/MediaStreamTrack/getCapabilities
+---
+<p>{{APIRef("Media Capture and Streams")}}</p>
+
+<p><span class="seoSummary">{{domxref("MediaStreamTrack")}} 接口的 <strong><code>getCapabilities()</code></strong> 方法返回一个  {{domxref('MediaTrackCapabilities')}} 对象，此对象表示每个可调节属性的值或者范围，该特性依赖于平台和{{Glossary("user agent")}}.</span></p>
+
+<p>一旦你知道了浏览器的功能，你的脚本可以通过调用 {{domxref("MediaStreamTrack.applyConstraints", "applyConstraints()")}} 来请求配置为匹配理想或可接受的设置。参考{{SectionOnPage("/zh-CN/docs/Web/API/Media_Streams_API", "Capabilities and constraints")}} 以了解受限制属性的具体细节。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">var <em>capabilities</em> = <em>MediaStreamTrack</em>.getCapabilities();</pre>
+
+<h3 id="参数">参数</h3>
+
+<p>没有参数。</p>
+
+<h3 id="返回值"><span style="font-size: 1.714rem; letter-spacing: -0.021em; line-height: 1;">返回值</span></h3>
+
+<p>A {{domxref('MediaTrackCapabilities')}} object which specifies the value or range of values which are supported for each of the user agent's supported constrainable properties.</p>
+
+<h2 id="规范">规范</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('Media Capture', '#dom-mediastreamtrack-getconstraints', 'getConstraints()')}}</td>
+   <td>{{Spec2('Media Capture')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+
+
+<p>{{Compat("api.MediaStreamTrack.getCapabilities")}}</p>