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+---
+title: ServiceWorker.state
+slug: Web/API/ServiceWorker/state
+tags:
+  - API
+  - Property
+  - Reference
+  - Référence(2)
+  - Service Workers
+  - ServiceWorker
+  - state
+translation_of: Web/API/ServiceWorker/state
+---
+<div>{{SeeCompatTable}}{{APIRef("Service Workers API")}}</div>
+
+<p><code>ServiceWorker</code> インターフェイスの読み込みプロパティである <strong><code>state</code></strong> は service workerの現在の状態を表す文字列を返します。それは次のいずれかです: <code>installing</code>, <code>installed,</code> <code>activating</code>, <code>activated</code>, <code>redundant</code>。</p>
+
+<h2 id="Syntax" name="Syntax">構文</h2>
+
+<pre class="syntaxbox">someURL = ServiceWorker.state
+</pre>
+
+<h3 id="Value" name="Value">値</h3>
+
+<p>{{domxref("ServiceWorkerState")}} 定義 (<a href="http://slightlyoff.github.io/ServiceWorker/spec/service_worker/#service-worker-state-enum">仕様を見てください</a>)</p>
+
+<h2 id="Examples" name="Examples">例</h2>
+
+<p>このコードスニペットは<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>)から持ってきています。コードは {{domxref("ServiceWorker.state")}} のあらゆる変更をリッスンしてその値を返します。</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="Specifications" name="Specifications">仕様</h2>
+
+<table class="standard-table">
+ <tbody>
+  <tr>
+   <th scope="col">仕様書</th>
+   <th scope="col">策定状況</th>
+   <th scope="col">コメント</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Service Workers', '#service-worker-state-attribute', 'state')}}</td>
+   <td>{{Spec2('Service Workers')}}</td>
+   <td>初期定義</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="Browser_compatibility" name="Browser_compatibility">ブラウザー実装状況</h2>
+
+<div>
+
+
+<p>{{Compat("api.ServiceWorker.state")}}</p>
+</div>