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+---
+title: CacheStorage.open()
+slug: Web/API/CacheStorage/open
+tags:
+  - API
+  - CacheStorage
+  - Experimental
+  - Method
+  - Reference
+  - ServiceWorker
+translation_of: Web/API/CacheStorage/open
+---
+<p>{{APIRef("Service Workers API")}}{{SeeCompatTable}}</p>
+
+<p><strong><code>open()</code></strong> метод из {{domxref("CacheStorage")}} интерфейса возвращает {{jsxref("Promise")}} который резолвится в {{domxref("Cache")}} обьект с соответствующим <code>cacheName (именем тега кеша)</code>.</p>
+
+<div class="note">
+<p><strong>Note</strong>: If the specified {{domxref("Cache")}} does not exist, a new cache is created with that <code>cacheName</code>.</p>
+</div>
+
+<h2 id="Синтакс">Синтакс</h2>
+
+<pre class="syntaxbox">caches.open(<em>cacheName</em>).then(function(<em>cache</em>) {
+  //обрабатываем кеш например: cache.AddAll(filesToCache); где filesToCache = ['/mypic.png', ...]
+});
+</pre>
+
+<h3 id="Возвращает">Возвращает</h3>
+
+<p>{{jsxref("Promise")}} который резолвится в запрашиваемый {{domxref("Cache")}} обьект.</p>
+
+<h3 id="Параметры">Параметры</h3>
+
+<dl>
+ <dt>cacheName</dt>
+ <dd>Имя (тег) кеша заданное заранее которое необходимо открыть.</dd>
+</dl>
+
+<h2 id="Примеры" style="line-height: 30px; font-size: 2.14285714285714rem;">Примеры</h2>
+
+<p>This code snippet is from the MDN <a href="https://github.com/mdn/sw-test/">sw-test example</a> (see <a href="https://mdn.github.io/sw-test/">sw-test running live</a>). Here we wait for a {{domxref("FetchEvent")}} to fire. Then we construct a custom response like so:</p>
+
+<ol>
+ <li>Check whether a match for the request is found in the {{domxref("CacheStorage")}} using {{domxref("CacheStorage.match")}}. If so, serve that.</li>
+ <li>If not, open the <code>v1</code> cache using {{domxref("CacheStorage.open")}}, put the default network request in the cache using {{domxref("Cache.put")}} and return a clone of the default network request using <code>return response.clone()</code> — necessary because <code>put()</code> consumes the response body.</li>
+ <li>If this fails (e.g., because the network is down), return a fallback response.</li>
+</ol>
+
+<pre class="brush: js">var response;
+var cachedResponse = caches.match(event.request).catch(function() {
+  return fetch(event.request);
+}).then(function(r) {
+  response = r;
+  caches.open('v1').then(function(cache) {
+    cache.put(event.request, response);
+  });
+  return response.clone();
+}).catch(function() {
+  return caches.match('/sw-test/gallery/myLittleVader.jpg');
+});</pre>
+
+<h2 id="Specifications">Specifications</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', '#cache-storage', 'CacheStorage')}}</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>{{CompatChrome(40.0)}}</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>Android Webview</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>) have been disabled in the <a href="https://www.mozilla.org/en-US/firefox/organizations/">Firefox 45 Extended Support Release</a> (ESR.)</p>
+
+<h2 id="See_also">See also</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>