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

<p><code><strong>RTCPeerConnection.ondatachannel </strong>属性</code>是一个{{event("Event_handlers", "event handler")}}，当这个{{event("datachannel")}}事件在{{domxref("RTCPeerConnection")}}发生时，它指定的那个事件处理函数就会被调用。这个事件继承于 {{domxref("RTCDataChannelEvent")}}，当远方伙伴调用{{domxref("RTCPeerConnection.createDataChannel", "createDataChannel()")}}时这个事件被加到这个连接（RTCPeerConnection）中。</p>

<p>在这个事件被收到的同时，这个{{domxref("RTCDataChannel")}} 实际上并没有打开，确保在open这个事件在<code>RTCDataChannel</code>触发以后才去使用它。</p>

<h2 id="语法">语法</h2>

<pre class="syntaxbox"><em>RTCPeerConnection</em>.ondatachannel = <em>function</em>;
</pre>

<h3 id="值">值</h3>

<p>将这个属性设置为接受一个参数的函数：这个参数是一个{{domxref("RTCDataChannelEvent")}}，它的channel属性是一个已经创建了的{{domxref("RTCDataChannel")}}对象</p>

<h2 id="示例">示例</h2>

<pre class="brush: js">pc.ondatachannel = function(ev) {
  console.log('Data channel is created!');
  ev.channel.onopen = function() {
    console.log('Data channel is open and ready to be used.');
  };
};
</pre>

<h2 id="规范">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', '#dom-rtcpeerconnection-ondatachannel', 'RTCPeerConnection.ondatachannel') }}</td>
   <td>{{ Spec2('WebRTC 1.0') }}</td>
   <td>Initial specification.</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>Basic support</td>
   <td>{{ CompatVersionUnknown}} [1]</td>
   <td>{{ CompatGeckoDesktop(18) }} [2]</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>{{ CompatGeckoMobile(22) }} [2]</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>

<p>[2] This property's name isn't prefixed, but the interface it's in, {{domxref("RTCPeerConnection")}}, was prefixed as <code>MozRTCPeerConnection</code> until Firefox 44.</p>

<h2 id="相关阅读">相关阅读</h2>

<ul>
 <li>The {{event("datachannel")}} event and its type, {{domxref("RTCDataChannelEvent")}}.</li>
 <li>{{domxref("RTCPeerConnection.createDataChannel()")}}</li>
 <li><a href="/en-US/docs/Web/API/WebRTC_API/Simple_RTCDataChannel_sample">A simple RTCDataChannel sample</a></li>
</ul>