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---
title: ServiceWorker.state
slug: Web/API/ServiceWorker/state
translation_of: Web/API/ServiceWorker/state
---
<div>{{SeeCompatTable}}{{APIRef("Service Workers API")}}</div>
<div>ServiceWorker接口的这个只读的<strong>state</strong>属性返回一个代表service worker当前状态的字符串。值可以是以下这些：installing, installed, activating, activated, 或者是redundant.</div>
<h2 id="Syntax" name="Syntax">语法</h2>
<pre class="syntaxbox">someURL = ServiceWorker.state
</pre>
<h3 id="值">值</h3>
<p>一个 {{domxref("ServiceWorkerState")}} 的定义值 (<a href="http://slightlyoff.github.io/ServiceWorker/spec/service_worker/#service-worker-state-enum">see the spec</a>.)</p>
<h2 id="示例">示例</h2>
<p>这块代码出自 <a href="https://github.com/GoogleChrome/samples/blob/gh-pages/service-worker/registration-events/index.html">service worker registration-events sample</a> (<a href="https://googlechrome.github.io/samples/service-worker/registration-events/">live demo</a>). 代码监听了任何{{domxref("ServiceWorker.state")}}中的改变，并返回它的值.</p>
<pre class="brush: js">var serviceWorker;
if (registration.installing) {
serviceWorker = registration.installing;
document.querySelector('#kind').textContent = 'installing';
} else if (registration.waiting) {
serviceWorker = registration.waiting;
document.querySelector('#kind').textContent = 'waiting';
} else if (registration.active) {
serviceWorker = registration.active;
document.querySelector('#kind').textContent = 'active';
}
if (serviceWorker) {
logState(serviceWorker.state);
serviceWorker.addEventListener('statechange', function(e) {
logState(e.target.state);
});
}</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', '#service-worker-state-attribute', 'state')}}</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>
{{Compat("api.ServiceWorker.state")}}
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