--- title: WindowEventHandlers.onmessage slug: Web/API/WindowEventHandlers/onmessage tags: - API - Event Handler - HTML DOM - Property - Reference - Window - WindowEventHandlers - events - onmessage translation_of: Web/API/WindowEventHandlers/onmessage --- <div>{{APIRef("HTML DOM")}}{{ SeeCompatTable() }}</div> <p>{{domxref("WindowEventHandlers")}} ミックスインの <strong><code>onmessage</code></strong> プロパティは、オブジェクトが {{event("message")}} イベントを受け取るたびに呼び出される {{event("Event_handlers", "event handler")}} です。</p> <h2 id="Syntax" name="Syntax">構文</h2> <pre class="syntaxbox">window.addEventListener('message', function(event) { ... }) window.onmessage = function(event) { ... }</pre> <h2 id="Specifications" name="Specifications">仕様</h2> <table class="standard-table"> <tbody> <tr> <th scope="col">仕様</th> <th scope="col">状態</th> <th scope="col">コメント</th> </tr> <tr> <td>{{SpecName('HTML WHATWG','#handler-window-onmessage','onmessage')}}</td> <td>{{Spec2('HTML WHATWG')}}</td> <td>初期定義</td> </tr> </tbody> </table> <h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザーの互換性</h2> <div> <p>{{Compat("api.WindowEventHandlers.onmessage")}}</p> </div>