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+---
+title: CacheStorage.has()
+slug: Web/API/CacheStorage/has
+translation_of: Web/API/CacheStorage/has
+---
+<p>{{APIRef("Service Workers API")}}{{SeeCompatTable}}</p>
+
+<p>{{domxref("CacheStorage")}} 对象的 <strong><code>has()</code></strong>方法返回一个 {{jsxref("Promise")}} 对象，当 {{domxref("Cache")}} 对象有 <code>cacheName</code>  时被处理为  <code>true</code> 。</p>
+
+<h2 id="语法">语法</h2>
+
+<pre class="syntaxbox">caches.has(<em>cacheName</em>).then(function(<em>boolean</em>) {
+  // true: 缓存存在
+});
+</pre>
+
+<h3 id="返回值">返回值</h3>
+
+<p>返回一个 {{jsxref("Promise")}} 对象，缓存存在时resolve的布尔值为 <code>true</code> 否则为 <code>false</code> 。</p>
+
+<h3 id="参数">参数</h3>
+
+<dl>
+ <dt>cacheName</dt>
+ <dd>一个表示你正在 {{domxref("CacheStorage")}} 中查找的 {{domxref("Cache")}} 对象name的 {{domxref("DOMString")}}.</dd>
+</dl>
+
+<h2 id="例子" style="line-height: 30px; font-size: 2.14285714285714rem;">例子</h2>
+
+<p>在下面的例子中首先检测是否有名为 v1 的缓存存在， 如果存在我们会向其添加内容,，如果不存在我们会做些对应的初始化动作。</p>
+
+<pre class="brush: js">caches.has('v1').then(function(hasCache) {
+  if (!hasCache) {
+    someCacheSetupfunction();
+  } else {
+    caches.open('v1').then(function(cache) {
+      return cache.addAll(myAssets);
+    });
+  }
+}).catch(function() {
+  // 处理异常
+});</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">附加信息</th>
+  </tr>
+  <tr>
+   <td>{{SpecName('Service Workers', '#cache-storage', 'CacheStorage')}}</td>
+   <td>{{Spec2('Service Workers')}}</td>
+   <td>初始定义</td>
+  </tr>
+ </tbody>
+</table>
+
+<h2 id="浏览器兼容性">浏览器兼容性</h2>
+
+<p>{{CompatibilityTable}}</p>
+
+<div id="compat-desktop">
+<table class="compat-table">
+ <tbody>
+  <tr>
+   <th>Feature</th>
+   <th>Chrome</th>
+   <th>Edge</th>
+   <th>Firefox (Gecko)</th>
+   <th>Internet Explorer</th>
+   <th>Opera</th>
+   <th>Safari</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatChrome(40.0)}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatGeckoDesktop(44)}}<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>
+   <th>Chrome for Android</th>
+  </tr>
+  <tr>
+   <td>Basic support</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatNo}}</td>
+   <td>{{CompatGeckoMobile(44)}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatVersionUnknown}}</td>
+   <td>{{CompatChrome(40.0)}}</td>
+  </tr>
+ </tbody>
+</table>
+</div>
+
+<p>[1] Service workers (and <a href="/en-US/docs/Web/API/Push_API">Push</a>) 在 <a href="https://www.mozilla.org/en-US/firefox/organizations/">Firefox 45 &amp; 52 Extended Support Releases</a> (ESR.)被默认禁用。</p>
+
+<h2 id="参考">参考</h2>
+
+<ul>
+ <li><a href="https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorker_API/Using_Service_Workers">Using Service Workers</a></li>
+ <li>{{domxref("Cache")}}</li>
+ <li>{{domxref("WorkerGlobalScope.caches")}}</li>
+</ul>