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---
title: Client.postMessage()
slug: Web/API/Client/postMessage
translation_of: Web/API/Client/postMessage
---
<p>{{SeeCompatTable}}{{APIRef("Client")}}</p>
<p class="summary">{{domxref("Client")}} 接口的 <code><strong>Client.postMessage()</strong></code> 方法允许一个service worker客户端向一个 {{domxref("ServiceWorker")}}发送一个消息，会触发service worker的message事件，通过监听这个事件，可以获取这个消息。</p>
<h2 id="语法">语法</h2>
<pre class="brush: js">Client.postMessage(message[, transfer]);</pre>
<h3 id="返回">返回</h3>
<p>Void.</p>
<h3 id="参数">参数</h3>
<dl>
<dt><code>message</code></dt>
<dd>发送给service worker的消息内容。</dd>
<dt><code>transfer {{optional_inline}}</code></dt>
<dd>可转移的对象，例如对端口的引用。</dd>
</dl>
<h2 id="例子">例子</h2>
<p>从 service worker 向 client 发送消息：</p>
<pre class="brush: js line-numbers language-js"><code class="language-js"><span class="function token">addEventListener</span><span class="punctuation token">(</span><span class="string token">'fetch'</span><span class="punctuation token">,</span> <span class="parameter token">event</span> <span class="operator token">=></span> <span class="punctuation token">{</span>
event<span class="punctuation token">.</span><span class="function token">waitUntil</span><span class="punctuation token">(</span><span class="keyword token">async</span> <span class="keyword token">function</span><span class="punctuation token">(</span><span class="punctuation token">)</span> <span class="punctuation token">{</span>
<span class="comment token">// Exit early if we don't have access to the client.</span>
<span class="comment token">// Eg, if it's cross-origin.</span>
<span class="keyword token">if</span> <span class="punctuation token">(</span><span class="operator token">!</span>event<span class="punctuation token">.</span>clientId<span class="punctuation token">)</span> <span class="keyword token">return</span><span class="punctuation token">;</span>
<span class="comment token">// Get the client.</span>
<span class="keyword token">const</span> client <span class="operator token">=</span> <span class="keyword token">await</span> clients<span class="punctuation token">.</span><span class="function token">get</span><span class="punctuation token">(</span>event<span class="punctuation token">.</span>clientId<span class="punctuation token">)</span><span class="punctuation token">;</span>
<span class="comment token">// Exit early if we don't get the client.</span>
<span class="comment token">// Eg, if it closed.</span>
<span class="keyword token">if</span> <span class="punctuation token">(</span><span class="operator token">!</span>client<span class="punctuation token">)</span> <span class="keyword token">return</span><span class="punctuation token">;</span>
<span class="comment token">// Send a message to the client.</span>
client<span class="punctuation token">.</span><span class="function token">postMessage</span><span class="punctuation token">(</span><span class="punctuation token">{</span>
msg<span class="punctuation token">:</span> <span class="string token">"Hey I just got a fetch from you!"</span><span class="punctuation token">,</span>
url<span class="punctuation token">:</span> event<span class="punctuation token">.</span>request<span class="punctuation token">.</span>url
<span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
<span class="punctuation token">}</span><span class="punctuation token">(</span><span class="punctuation token">)</span><span class="punctuation token">)</span><span class="punctuation token">;</span>
<span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span></code></pre>
<p><span class="punctuation token">接收message:</span></p>
<pre class="brush: js line-numbers language-js"><code class="language-js">navigator<span class="punctuation token">.</span>serviceWorker<span class="punctuation token">.</span><span class="function token">addEventListener</span><span class="punctuation token">(</span><span class="string token">'message'</span><span class="punctuation token">,</span> <span class="parameter token">event</span> <span class="operator token">=></span> <span class="punctuation token">{</span>
console<span class="punctuation token">.</span><span class="function token">log</span><span class="punctuation token">(</span>event<span class="punctuation token">.</span>data<span class="punctuation token">.</span>msg<span class="punctuation token">,</span> event<span class="punctuation token">.</span>data<span class="punctuation token">.</span>url<span class="punctuation token">)</span><span class="punctuation token">;</span>
<span class="punctuation token">}</span><span class="punctuation token">)</span><span class="punctuation token">;</span></code> </pre>
<h2 id="Specifications">Specifications</h2>
<table class="standard-table">
<tbody>
<tr>
<th scope="col">Specification</th>
<th scope="col">Status</th>
<th scope="col">Comment</th>
</tr>
<tr>
<td>{{SpecName('Service Workers', '#client-postmessage-method', 'postMessage()')}}</td>
<td>{{Spec2('Service Workers')}}</td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="Browser_compatibility">Browser compatibility</h2>
{{Compat("api.Client.postMessage")}}
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