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+---
+title: EventSource.onerror
+slug: Web/API/EventSource/onerror
+translation_of: Web/API/EventSource/onerror
+original_slug: Server-sent_events/EventSource/onerror
+---
+<div>{{APIRef('WebSockets API')}}</div>
+
+<div> </div>
+
+
+<p>{{domxref("EventSource")}} 的属性 <code><strong>onerror</strong></code> 是当发生错误且这个错误事件（{{event("error")}} ）被EventSource触发时调用的一个事件处理函数（{{domxref("EventHandler")}}）</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">eventSource.onerror = function</pre>
+
+<h2 id="例子">例子</h2>
+
+<pre class="brush: js">evtSource.onerror = function() {
+  console.log("EventSource failed.");
+};</pre>
+
+<div class="note">
+<p><strong>Note</strong>: 你可以在Github上查看这个完整例子： <a href="https://github.com/mdn/dom-examples/tree/master/server-sent-events">Simple SSE demo using PHP.</a></p>
+</div>
+
+<h2 id="规范">规范</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('HTML WHATWG', "comms.html#handler-eventsource-onerror", "onerror")}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td>Initial definition</td>
+  </tr>
+ </tbody>
+</table>
+
+<ul>
+</ul>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<div>{{CompatibilityTable}}</div>
+
+<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>EventSource support</td>
+   <td>6</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoDesktop("6.0")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>5</td>
+  </tr>
+  <tr>
+   <td>Available in shared and dedicated workers<sup>[1]</sup></td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoDesktop("53.0")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<div id="compat-mobile">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Android</th>
+   <th>Firefox Mobile (Gecko)</th>
+   <th>IE Mobile</th>
+   <th>Opera Mobile</th>
+   <th>Safari Mobile</th>
+  </tr>
+  <tr>
+   <td>EventSource support</td>
+   <td>4.4</td>
+   <td>45</td>
+   <td>{{CompatNo}}</td>
+   <td>12</td>
+   <td>4.1</td>
+  </tr>
+  <tr>
+   <td>Available in shared and dedicated workers<sup>[1]</sup></td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoMobile("53.0")}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] But <a href="https://github.com/w3c/ServiceWorker/issues/947">not service workers as yet</a>.</p>
+
+<h2 id="相关链接">相关链接</h2>
+
+<ul>
+ <li>{{domxref("EventSource")}}</li>
+</ul>