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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><code><strong>WebSocket.onclose</strong></code> プロパティは、WebSocket コネクションの {{domxref("WebSocket.readyState","readyState")}} が {{domxref("WebSocket.readyState","CLOSED")}} に変わったときに呼ばれる {{domxref("EventHandler")}} です。{{domxref("CloseEvent")}} と一緒に呼び出されます。</p>
+
+<h2 id="構文">構文</h2>
+
+<pre class="syntaxbox notranslate"><em>aWebSocket</em>.onclose = function(event) {
+  console.log("WebSocket is closed now.");
+};</pre>
+
+<h2 id="値">値</h2>
+
+<p>{{domxref("EventListener")}}.</p>
+
+<h2 id="仕様書">仕様書</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>