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---
title: BroadcastChannel.postMessage()
slug: Web/API/BroadcastChannel/postMessage
translation_of: Web/API/BroadcastChannel/postMessage
---
<p>{{APIRef("BroadCastChannel API")}}</p>
<p>可以使用 <strong><code>BroadcastChannel.postMessage()</code></strong> 发送一条任意 {{jsxref("Object")}} 类型的消息，给所有同{{glossary("origin", "源")}}下监听了该频道的所有{{glossary("browsing context", "浏览器上下文")}}。消息以 {{event("message")}} 事件的形式发送给每一个绑定到该频道的广播频道。</p>
<p>{{AvailableInWorkers}}</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox">var <em>str</em> = <em>channe<code>l</code></em><code>.postMessage(<em>object</em>);</code>
</pre>
<h2 id="规范">规范</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">规范</th>
<th scope="col">状态</th>
<th scope="col">备注</th>
</tr>
<tr>
<td>{{SpecName('HTML WHATWG', "comms.html#dom-broadcastchannel-postmessage", "BroadcastChannel.postmessage()")}}</td>
<td>{{Spec2('HTML WHATWG')}}</td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="浏览器兼容性">浏览器兼容性</h2>
<p>{{Compat("api.BroadcastChannel.postMessage")}}</p>
<h2 id="另见">另见</h2>
<ul>
<li>所属接口：{{domxref("BroadcastChannel")}}</li>
</ul>
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