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+---
+title: WebSocket.onmessage
+slug: conflicting/Web/API/WebSocket/message_event
+tags:
+  - API
+  - Property
+  - Reference
+  - Web API
+  - WebSocket
+  - プロパティ
+translation_of: Web/API/WebSocket/onmessage
+original_slug: Web/API/WebSocket/onmessage
+---
+<div>{{APIRef("Web Sockets API")}}</div>
+
+<p><strong><code>WebSocket.onmessage</code></strong> プロパティは、サーバーからメッセージが届いたときに呼び出されるイベントハンドラー ({{event("Event_handlers", "event handler")}}) です。これは {{domxref("MessageEvent")}} で呼び出されます。</p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox notranslate"><em>aWebSocket</em>.onmessage = function(event) {
+  console.debug("WebSocket message received:", event);
+};</pre>
+
+<h2 id="Value" name="Value">値</h2>
+
+<p>{{domxref("EventListener")}} です。</p>
+
+<h2 id="Specifications" name="Specifications">仕様書</h2>
+
+<table class="standard-table">
+ <thead>
+  <tr>
+   <th scope="col">仕様書</th>
+   <th scope="col">状態</th>
+   <th scope="col">備考</th>
+  </tr>
+ </thead>
+ <tbody>
+  <tr>
+   <td>{{SpecName('HTML WHATWG', '#handler-websocket-onmessage', 'WebSocket: onmessage')}}</td>
+   <td>{{Spec2('HTML WHATWG')}}</td>
+   <td>初回定義</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2>
+
+<p>{{Compat("api.WebSocket.onmessage")}}</p>