---
title: RTCPeerConnection.onaddstream
slug: Web/API/RTCPeerConnection/onaddstream
translation_of: Web/API/RTCPeerConnection/onaddstream
---
<p>{{APIRef("WebRTC")}}{{SeeCompatTable}}</p>

<p><code><strong>当类型为</strong></code>{{domxref("MediaStreamEvent")}}的{{event("addstream")}} 事件发生时，通过{{domxref("RTCPeerConnection")}}触发<code><strong>RTCPeerConnection.onaddstream</strong></code> 事件处理函数。当远程媒体流{{domxref("MediaStream")}} 添加到连接后发送事件。当{{domxref("RTCPeerConnection.setRemoteDescription()")}} 后此事件立即被调用而不需要等待SDP交换完成。</p>

<h2 id="语法">语法</h2>

<pre class="eval"><em>peerconnection</em>.onaddstream = <em>function</em>;
</pre>

<h3 id="值">值</h3>

<ul>
 <li><code>function</code> 是用户自定义的一个函数，写法上不带 <code>()</code> 和任何参数，也可以是一个匿名函数，例如 <code>function(event) {...}</code>。事件处理函数通常有个event做参数，类型为 {{domxref("MediaStreamEvent")}}.</li>
</ul>

<h2 id="例子">例子</h2>

<pre class="brush: js">pc.onaddstream = function(ev) { alert("onaddstream event detected!"); };
</pre>

<h2 id="Specifications" name="Specifications">规范</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">Specification</th>
   <th scope="col">Status</th>
   <th scope="col">Comment</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{ SpecName('WebRTC 1.0', '#widl-RTCPeerConnection-onaddstream', 'RTCPeerConnection.onaddstream') }}</td>
   <td>{{ Spec2('WebRTC 1.0') }}</td>
   <td>Initial specification.</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</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>Basic support</td>
   <td>{{ CompatVersionUnknown() }} [1]</td>
   <td>{{ CompatVersionUnknown }} [1]</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>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>{{ CompatUnknown() }}</td>
   <td>{{ CompatNo() }}</td>
   <td>{{ CompatUnknown() }}</td>
   <td>{{ CompatUnknown() }}</td>
  </tr>
 </tbody>
</table>
</div>

<p>[1] Though this property is not prefixed, the interface it belongs to is.</p>

<h2 id="扩展阅读">扩展阅读</h2>

<ul>
 <li>The {{event("addstream")}} event and its type, {{domxref("MediaStreamEvent")}}.</li>
</ul>