[CRON] sync translated content

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+---
+title: WebSocket.onclose
+slug: Web/API/WebSocket/close_event
+translation_of: Web/API/WebSocket/onclose
+original_slug: 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>