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---
title: WindowOrWorkerGlobalScope.caches
slug: Web/API/WindowOrWorkerGlobalScope/caches
translation_of: Web/API/WindowOrWorkerGlobalScope/caches
---
<p>{{APIRef()}}{{SeeCompatTable}}</p>
<p><code><strong>caches</strong></code> 是{{domxref("WindowOrWorkerGlobalScope")}}接口的一个只读属性，它返回了与当前上下文紧密相关的{{domxref("CacheStorage")}}对象。此对象激活了诸如存储用于离线使用的资产，并生成对请求生成自定义响应等功能。</p>
<h2 id="语法">语法</h2>
<pre class="syntaxbox">var <em>myCacheStorage</em> = self.caches; // or just caches
</pre>
<h3 id="值">值</h3>
<p>{{domxref("CacheStorage")}} 对象.</p>
<h2 id="例子">例子</h2>
<p>下面的例子展示了你在<a href="/en-US/docs/Web/API/Service_Worker_API">service worker</a>上下文中如何应该运用cache对离线资产的进行存储。</p>
<pre class="brush: js">this.addEventListener('install', function(event) {
event.waitUntil(
caches.open('v1').then(function(cache) {
return cache.addAll(
'/sw-test/',
'/sw-test/index.html',
'/sw-test/style.css',
'/sw-test/app.js',
'/sw-test/image-list.js',
'/sw-test/star-wars-logo.jpg',
'/sw-test/gallery/',
'/sw-test/gallery/bountyHunters.jpg',
'/sw-test/gallery/myLittleVader.jpg',
'/sw-test/gallery/snowTroopers.jpg'
);
})
);
});</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', '#self-caches', 'caches')}}</td>
<td>{{Spec2('Service Workers')}}</td>
<td>Defined in a <code>WindowOrWorkerGlobalScope</code> partial in the newest spec.</td>
</tr>
<tr>
<td>{{SpecName('Service Workers')}}</td>
<td>{{Spec2('Service Workers')}}</td>
<td>Initial definition.</td>
</tr>
</tbody>
</table>
<h2 id="Browser_compatibility">Browser compatibility</h2>
<p>{{CompatibilityTable}}</p>
<div id="compat-desktop">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Chrome</th>
<th>Firefox (Gecko)</th>
<th>Internet Explorer</th>
<th>Opera</th>
<th>Safari</th>
</tr>
<tr>
<td>Basic support</td>
<td>40.0</td>
<td>{{CompatGeckoDesktop(42)}}<br>
{{CompatGeckoDesktop(52)}}<sup>[1]</sup></td>
<td>{{CompatNo}}</td>
<td>{{CompatUnknown}}</td>
<td>{{CompatNo}}</td>
</tr>
</tbody>
</table>
</div>
<div id="compat-mobile">
<table class="compat-table">
<tbody>
<tr>
<th>Feature</th>
<th>Android</th>
<th>Chrome for Android</th>
<th>Firefox Mobile (Gecko)</th>
<th>IE Mobile</th>
<th>Opera Mobile</th>
<th>Safari Mobile</th>
</tr>
<tr>
<td>Basic support</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatGeckoMobile(42)}}<br>
{{CompatGeckoMobile(52)}}<sup>[1]</sup></td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
<td>{{CompatVersionUnknown}}</td>
</tr>
</tbody>
</table>
</div>
<p>[1] <code>caches 现在被定义在</code> {{domxref("WindowOrWorkerGlobalScope")}} 中的mixin里.</p>
<h2 id="相关链接">相关链接</h2>
<ul>
<li><a href="/en-US/docs/Web/API/ServiceWorker_API">Service Workers</a></li>
<li><a href="/en-US/docs/Web/API/Web_Workers_API">Web Workers</a></li>
<li>{{domxref("CacheStorage")}}</li>
<li>{{domxref("Cache")}}</li>
</ul>
|
