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---
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")}} 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>
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