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---
title: WebSocket.onclose
slug: Web/API/WebSocket/onclose
translation_of: Web/API/WebSocket/onclose
---
<p>{{APIRef("Web Sockets API")}}</p>
<p><strong><code>WebSocket.onclose</code></strong> 属性返回一个事件监听器，这个事件监听器将在 WebSocket 连接的{{domxref("WebSocket.readyState","readyState")}} 变为 <code>CLOSED</code>时被调用，它接收一个名字为“close”的 {{domxref("CloseEvent")}} 事件。</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox"><em>WebSocket</em>.onclose = function(event) {
console.log("WebSocket is closed now.");
};</pre>
<h2 id="值">值</h2>
<p>一个{{domxref("EventListener")}}.</p>
<h2 id="文档">文档</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('HTML WHATWG', '#handler-websocket-onclose', 'WebSocket: onclose')}}</td>
<td>{{Spec2('HTML WHATWG')}}</td>
<td>Initial definition</td>
</tr>
</tbody>
</table>
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