---
title: Clients
slug: Web/API/Clients
translation_of: Web/API/Clients
---
<p>{{SeeCompatTable}}{{APIRef("Service Workers API")}}</p>

<p><span class="seoSummary"><code>Clients</code> 接口提供对 {{domxref("Client")}} 对象的访问. 通过在  <a href="/en-US/docs/Web/API/ServiceWorker_API">service worker</a> 中使用 <code>{{domxref("ServiceWorkerGlobalScope", "self")}}.clients</code> 访问它.</span></p>

<h2 id="方法">方法</h2>

<dl>
 <dt>{{domxref("Clients.get()")}}</dt>
 <dd>返回一个匹配给定 {{domxref("Client.id", "id")}} 的 {{domxref("Client")}} 的 {{jsxref("Promise")}} .</dd>
 <dt>{{domxref("Clients.matchAll()")}}</dt>
 <dd>返回一个 {{domxref("Client")}} 对象数组的 {{jsxref("Promise")}} . options参数允许您控制返回的clients类型. </dd>
 <dt>{{domxref("Clients.openWindow()")}}</dt>
 <dd>打开给定URL的新浏览器窗口，并返回新 {{domxref("WindowClient")}} a 的 {{jsxref("Promise")}} .</dd>
 <dt>{{domxref("Clients.claim()")}}</dt>
 <dd>允许一个激活的 service worker 将自己设置为其{{domxref("ServiceWorkerRegistration.scope", "scope")}} 内所有 clients 的 {{domxref("ServiceWorkerContainer.controller", "controller")}} . </dd>
</dl>

<h2 id="示例">示例</h2>

<p>下面示例显示一个已有的聊天窗口，或者当用户点击通知时创建新的窗口.</p>

<pre class="brush: js">addEventListener('notificationclick', event =&gt; {
  event.waitUntil(async function() {
    const allClients = await clients.matchAll({
      includeUncontrolled: true
    });

    let chatClient;

    // Let's see if we already have a chat window open:
    for (const client of allClients) {
      const url = new URL(client.url);

      if (url.pathname == '/chat/') {
        // Excellent, let's use it!
        client.focus();
        chatClient = client;
        break;
      }
    }

    // If we didn't find an existing chat window,
    // open a new one:
    if (!chatClient) {
      chatClient = await clients.openWindow('/chat/');
    }

    // Message the client:
    chatClient.postMessage("New chat messages!");
  }());
});
</pre>

<h2 id="规范">规范</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', '#clients', 'Clients')}}</td>
   <td>{{Spec2('Service Workers')}}</td>
   <td>Initial definition</td>
  </tr>
 </tbody>
</table>

<h2 id="浏览器兼容性">浏览器兼容性</h2>

<div>


<p>{{Compat("api.Clients")}}</p>
</div>

<h2 id="See_also">See also</h2>

<ul>
 <li><a href="/en-US/docs/Web/API/ServiceWorker_API/Using_Service_Workers">Using Service Workers</a></li>
 <li><a href="https://jakearchibald.github.io/isserviceworkerready/">Is ServiceWorker ready?</a></li>
 <li>{{jsxref("Promise")}}</li>
</ul>