---
title: WebSocket.onmessage
slug: Web/API/WebSocket/onmessage
tags:
  - API
  - Web API
  - WebSocket
  - 参考
  - 属性
translation_of: Web/API/WebSocket/onmessage
---
<p>{{APIRef("Web Sockets API")}}</p>

<p><code><strong>WebSocket.onmessage</strong></code> 属性是一个当收到来自服务器的消息时被调用的 {{domxref("EventHandler")}}。它由一个{{domxref("MessageEvent")}}调用。</p>

<h2 id="语法">语法</h2>

<pre class="syntaxbox"><em>aWebSocket</em>.onmessage = function(event) {
  console.debug("WebSocket message received:", event);
};</pre>

<h2 id="值">值</h2>

<p>一个 {{domxref("EventListener")}}.</p>

<h2 id="规范">规范</h2>

<table class="standard-table">
 <thead>
  <tr>
   <th scope="col">规范</th>
   <th scope="col">状态</th>
   <th scope="col">注释</th>
  </tr>
 </thead>
 <tbody>
  <tr>
   <td>{{SpecName('HTML WHATWG', '#handler-websocket-onmessage', 'WebSocket: onmessage')}}</td>
   <td>{{Spec2('HTML WHATWG')}}</td>
   <td>初始定义</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>



<p>{{Compat("api.WebSocket.onmessage")}}</p>