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+---
+title: MediaStreamEvent
+slug: Web/API/MediaStreamEvent
+translation_of: Web/API/MediaStreamEvent
+---
+<p>{{APIRef("WebRTC")}}{{SeeCompatTable}}</p>
+
+<p> <strong><code>MediaStreamEvent</code></strong> 接口表示发生在 {{domxref("MediaStream")}}中的事件.这种类型返回两个事件: {{event("addstream")}} 和 {{event("removestream")}}.</p>
+
+<h2 id="Properties">Properties</h2>
+
+<p><em>一个 {{domxref("MediaStreamEvent")}} <font>作为一个</font> {{domxref("Event")}}, </em>该事件也实现了这些属性.</p>
+
+<dl>
+ <dt>{{domxref("MediaStreamEvent.stream")}} {{readOnlyInline}}</dt>
+ <dd>包含了 {{domxref("MediaStream")}} 以及相关的事件流.</dd>
+</dl>
+
+<h2 id="Constructors">Constructors</h2>
+
+<dl>
+ <dt>{{domxref("MediaStreamEvent.MediaStreamEvent()", "MediaStreamEvent()")}}</dt>
+ <dd>返回一个新的 <code>MediaStreamEvent</code>.  它需要两个参数, 第一个为 {{domxref("DOMString")}} 代表事件的类型; 第二个是一个 {{domxref("MediaStream")}}集合 .</dd>
+</dl>
+
+<h2 id="Methods">Methods</h2>
+
+<p><em>一个 {{domxref("MediaStreamEvent")}} <font>作为一个</font> {{domxref("Event")}}, <font>这个事件也实现了这些属性</font></em>.  <em><font>没有特定的</font> <em>{{domxref("MediaStreamEvent")}}</em> 方法.</em></p>
+
+<h2 id="Examples">Examples</h2>
+
+<pre class="brush: js">pc.onaddstream = function( ev ) {
+  alert("A stream (id: '" + ev.stream.id + "') has been added to this connection.");
+};
+</pre>
+
+<h2 id="Specifications">Specifications</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('WebRTC 1.0', '#idl-def-MediaStreamEvent', 'MediaStreamEvent') }}</td>
+   <td>{{Spec2('WebRTC 1.0')}}</td>
+   <td>Initial definition.</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility">Browser compatibility</h2>
+
+<p>{{ CompatibilityTable() }}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{ CompatVersionUnknown() }}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{ CompatVersionUnknown }}</td>
+   <td>{{ CompatNo() }}</td>
+   <td>{{ CompatVersionUnknown() }}</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>Chrome for Android</th>
+   <th>Edge</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatNo() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+   <td>{{ CompatUnknown() }}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<h2 id="See_also">See also</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/Guide/API/WebRTC" title="/en-US/docs/CSS/Using_CSS_animations">WebRTC</a></li>
+ <li>Its usual target: {{domxref("RTCPeerConnection")}}.</li>
+</ul>