---
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（{{event("Event_handlers", "event handler")}}）</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>