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---
title: EventSource.onerror
slug: Web/API/EventSource/error_event
translation_of: Web/API/EventSource/onerror
original_slug: Web/API/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>
{{Compat("api.EventSource.onerror")}}
<h2 id="相关链接">相关链接</h2>
<ul>
<li>{{domxref("EventSource")}}</li>
</ul>
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