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---
title: ServiceWorkerContainer.controller
slug: Web/API/ServiceWorkerContainer/controller
translation_of: Web/API/ServiceWorkerContainer/controller
---
<div>{{SeeCompatTable}}{{APIRef("Service Workers API")}}</div>
<p><span class="seoSummary">当状态为<code>activated</code> 时， {{domxref("ServiceWorkerContainer")}} 接口的只读属性 <strong><code>controller</code></strong> 返回一个 {{domxref("ServiceWorker")}} 对象（与 {{domxref("ServiceWorkerRegistration.active")}} 返回的对象是同一个）。当页面强制刷新 (<em>Shift</em> + refresh) 或不存在active worder时，该属性返回 <code>null</code> 。</span></p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox">var myController = navigator.serviceWorker.controller;
</pre>
<h3 id="值">值</h3>
<p>一个{{domxref("ServiceWorker")}}对象.</p>
<h2 id="示例">示例</h2>
<pre class="brush: js">if ('serviceWorker' in navigator) {
// Do a one-off check to see if a service worker's in control.
if (navigator.serviceWorker.controller) {
console.log('This page is currently controlled by:',
navigator.serviceWorker.controller);
} else {
console.log('This page is not currently controlled ' +
'by a service worker.');
}
} else {
console.log('Service workers are not supported.');
}</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">附注</th>
</tr>
<tr>
<td>{{SpecName('Service Workers', '#navigator-service-worker-controller', 'ServiceWorkerRegistration.controller')}}</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>
<div class="hidden">此页面上的兼容性表从结构化数据生成。如果您想做出贡献，请查看 <a href="https://github.com/mdn/browser-compat-data">https://github.com/mdn/browser-compat-data</a> 并发送拉取请求.</div>
<p>{{Compat("api.ServiceWorkerContainer.controller")}}</p>
</div>
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