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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>
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