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+---
+title: 'RTCPeerConnection: icecandidate event'
+slug: Web/Events/icecandidate
+translation_of: Web/API/RTCPeerConnection/icecandidate_event
+---
+<p>{{SeeCompatTable}}</p>
+
+<p>当 {{domxref("RTCPeerConnection")}}通过{{domxref("RTCPeerConnection.setLocalDescription()")}}方法更改本地描述之后，该{{domxref("RTCPeerConnection")}}会抛出<strong><code>icecandidate</code></strong>事件。该事件的监听器需要将更改后的描述信息传送给远端{{domxref("RTCPeerConnection")}}，以更新远端的备选源。</p>
+
+<h2 id="使用指南">使用指南</h2>
+
+<p><code>icecandidate</code> 的类型为 {{domxref("RTCPeerIceCandidateEvent")}}, 在以下三种情况下会触发该事件：</p>
+
+<h3 id="分享新的源">分享新的源</h3>
+
+<p><code>触发icecandidate</code>事件的首要原因：当获得新的源之后，需要将该源的信息发送给远端信号服务器，并分发至其他端的{{domxref("RTCPeerConnection")}}。其他{{domxref("RTCPeerConnection")}}通过{{domxref("RTCPeerConnection.addIceCandidate", "addIceCandidate()")}}方法将新{{domxref("RTCPeerCandidateIceEvent.candidate", "candidate")}} 中携带的信息，将新的源描述信息添加进它的备选池中；</p>
+
+<pre>rtcPeerConnection.onicecandidate = (event) =&gt; {
+  if (event.candidate) {
+    sendCandidateToRemotePeer(event.candidate)
+  }
+}
+</pre>
+
+
+
+<h2 id="概述">概述</h2>
+
+<dl>
+ <dt style="float: left; text-align: right; width: 120px;">规范</dt>
+ <dd style="margin: 0 0 0 120px;">{{ SpecName('WebRTC 1.0', '#event-mediastream-icecandidate', 'icecandidate') }}</dd>
+ <dt style="float: left; text-align: right; width: 120px;">接口</dt>
+ <dd style="margin: 0 0 0 120px;">{{domxref("RTCPeerConnectionIceEvent")}}</dd>
+ <dt style="float: left; text-align: right; width: 120px;">事件冒泡</dt>
+ <dd style="margin: 0 0 0 120px;">否</dd>
+ <dt style="float: left; text-align: right; width: 120px;">能否取消默认</dt>
+ <dd style="margin: 0 0 0 120px;">否</dd>
+ <dt style="float: left; text-align: right; width: 120px;">事件目标</dt>
+ <dd style="margin: 0 0 0 120px;">{{domxref("RTCPeerConnection")}}</dd>
+ <dt style="float: left; text-align: right; width: 120px;">默认行为</dt>
+ <dd style="margin: 0 0 0 120px;">无</dd>
+</dl>
+
+<h2 id="属性">属性</h2>
+
+<p><em>属性继承自{{domxref("RTCPeerConnectionIceEvent")}}.</em></p>
+
+<h2 id="方法">方法</h2>
+
+<p><em>方法继承自 {{domxref("RTCPeerConnectionIceEvent")}}.</em></p>
+
+<h2 id="相关事件">相关事件</h2>
+
+<ul>
+ <li><em>无</em></li>
+</ul>
+
+<h2 id="规范">规范</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">规范</th>
+   <th scope="col">状态</th>
+   <th scope="col">注释</th>
+  </tr>
+  <tr>
+   <td>{{ SpecName('WebRTC 1.0', '#event-mediastream-icecandidate', 'icecandidate') }}</td>
+   <td>{{Spec2('WebRTC 1.0')}}</td>
+   <td></td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="兼容性">兼容性</h2>
+
+<p>{{ CompatibilityTable() }}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>特性</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>特性</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="参阅">参阅</h2>
+
+<ul>
+ <li><a href="/en-US/docs/Web/Guide/API/WebRTC" title="/en-US/docs/CSS/Using_CSS_animations">WebRTC</a></li>
+</ul>