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(简体)</span></a></li></ul></div></div></li></ul></div></div></div></div><div class="main-wrapper"><div class="sidebar-container"><aside id="sidebar-quicklinks" class="sidebar" data-macro="APIRef"><button type="button" class="button action backdrop" aria-label="Collapse sidebar"><span class="button-wrap"></span></button><nav aria-label="Related Topics" class="sidebar-inner"><header class="sidebar-actions"><section class="sidebar-filter-container"><div class="sidebar-filter "><label id="sidebar-filter-label" class="sidebar-filter-label" for="sidebar-filter-input"><span class="icon icon-filter"></span><span class="visually-hidden">Filter sidebar</span></label><input id="sidebar-filter-input" autoComplete="off" class="sidebar-filter-input-field false" type="text" placeholder="Filter" value=""/><button type="button" class="button action has-icon clear-sidebar-filter-button"><span class="button-wrap"><span class="icon icon-cancel "></span><span class="visually-hidden">Clear filter input</span></span></button></div></section></header><div class="sidebar-inner-nav"><div class="in-nav-toc"><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In this article</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#instance_methods">Instance methods</a></li><li class="document-toc-item "><a class="document-toc-link" href="#examples">Examples</a></li><li class="document-toc-item "><a class="document-toc-link" href="#specifications">Specifications</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser_compatibility">Browser compatibility</a></li><li class="document-toc-item "><a class="document-toc-link" href="#see_also">See also</a></li></ul></section></div></div><div class="sidebar-body"><ol><li class="section"><a href="/en-US/docs/Web/API/Service_Worker_API">Service Worker API</a></li><li class="section"><em><a href="/en-US/docs/Web/API/CacheStorage" aria-current="page"><code>CacheStorage</code></a></em></li><li class="toggle"><details open=""><summary>Instance methods</summary><ol><li><a href="/en-US/docs/Web/API/CacheStorage/delete"><code>delete()</code></a></li><li><a href="/en-US/docs/Web/API/CacheStorage/has"><code>has()</code></a></li><li><a href="/en-US/docs/Web/API/CacheStorage/keys"><code>keys()</code></a></li><li><a href="/en-US/docs/Web/API/CacheStorage/match"><code>match()</code></a></li><li><a href="/en-US/docs/Web/API/CacheStorage/open"><code>open()</code></a></li></ol></details></li><li class="toggle"><details open=""><summary>Related pages for Service Workers API</summary><ol><li><a href="/en-US/docs/Web/API/Cache"><code>Cache</code></a></li><li><a href="/en-US/docs/Web/API/Client"><code>Client</code></a></li><li><a href="/en-US/docs/Web/API/Clients"><code>Clients</code></a></li><li><a href="/en-US/docs/Web/API/ExtendableEvent"><code>ExtendableEvent</code></a></li><li><a href="/en-US/docs/Web/API/ExtendableMessageEvent"><code>ExtendableMessageEvent</code></a></li><li><a href="/en-US/docs/Web/API/FetchEvent"><code>FetchEvent</code></a></li><li><a href="/en-US/docs/Web/API/InstallEvent"><code>InstallEvent</code></a></li><li><a href="/en-US/docs/Web/API/NavigationPreloadManager"><code>NavigationPreloadManager</code></a></li><li><a href="/en-US/docs/Web/API/Navigator/serviceWorker"><code>Navigator.serviceWorker</code></a></li><li><a href="/en-US/docs/Web/API/ServiceWorker"><code>ServiceWorker</code></a></li><li><a href="/en-US/docs/Web/API/ServiceWorkerContainer"><code>ServiceWorkerContainer</code></a></li><li><a href="/en-US/docs/Web/API/ServiceWorkerGlobalScope"><code>ServiceWorkerGlobalScope</code></a></li><li><a href="/en-US/docs/Web/API/ServiceWorkerRegistration"><code>ServiceWorkerRegistration</code></a></li><li><a href="/en-US/docs/Web/API/Window/caches"><code>Window.caches</code></a></li><li><a href="/en-US/docs/Web/API/WindowClient"><code>WindowClient</code></a></li><li><a href="/en-US/docs/Web/API/WorkerGlobalScope/caches"><code>WorkerGlobalScope.caches</code></a></li><li><a href="/en-US/docs/Web/API/WorkerNavigator/serviceWorker"><code>WorkerNavigator.serviceWorker</code></a></li></ol></details></li></ol></div></div><section class="place side"></section></nav></aside><div class="toc-container"><aside class="toc"><nav><div class="document-toc-container"><section class="document-toc"><header><h2 class="document-toc-heading">In this article</h2></header><ul class="document-toc-list"><li class="document-toc-item "><a class="document-toc-link" href="#instance_methods">Instance methods</a></li><li class="document-toc-item "><a class="document-toc-link" href="#examples">Examples</a></li><li class="document-toc-item "><a class="document-toc-link" href="#specifications">Specifications</a></li><li class="document-toc-item "><a class="document-toc-link" href="#browser_compatibility">Browser compatibility</a></li><li class="document-toc-item "><a class="document-toc-link" href="#see_also">See also</a></li></ul></section></div></nav></aside><section class="place side"></section></div></div><main id="content" class="main-content "><article class="main-page-content" lang="en-US"><header><h1>CacheStorage</h1></header><div class="section-content"><div class="notecard secure"><p><strong>Secure context:</strong> This feature is available only in <a href="/en-US/docs/Web/Security/Secure_Contexts">secure contexts</a> (HTTPS), in some or all <a href="#browser_compatibility">supporting browsers</a>.</p></div><div class="notecard note"> <p><strong>Note:</strong> This feature is available in <a href="/en-US/docs/Web/API/Web_Workers_API">Web Workers</a>.</p> </div> <p>The <strong><code>CacheStorage</code></strong> interface represents the storage for <a href="/en-US/docs/Web/API/Cache"><code>Cache</code></a> objects.</p> <p>The interface:</p> <ul> <li>Provides a master directory of all the named caches that can be accessed by a <a href="/en-US/docs/Web/API/ServiceWorker"><code>ServiceWorker</code></a> or other type of worker or <a href="/en-US/docs/Web/API/Window"><code>window</code></a> scope (you're not limited to only using it with service workers).</li> <li>Maintains a mapping of string names to corresponding <a href="/en-US/docs/Web/API/Cache"><code>Cache</code></a> objects.</li> </ul> <p>Use <a href="/en-US/docs/Web/API/CacheStorage/open"><code>CacheStorage.open()</code></a> to obtain a <a href="/en-US/docs/Web/API/Cache"><code>Cache</code></a> instance.</p> <p>Use <a href="/en-US/docs/Web/API/CacheStorage/match"><code>CacheStorage.match()</code></a> to check if a given <a href="/en-US/docs/Web/API/Request"><code>Request</code></a> is a key in any of the <a href="/en-US/docs/Web/API/Cache"><code>Cache</code></a> objects that the <code>CacheStorage</code> object tracks.</p> <p>You can access <code>CacheStorage</code> through the <a href="/en-US/docs/Web/API/Window/caches"><code>Window.caches</code></a> property in windows or through the <a href="/en-US/docs/Web/API/WorkerGlobalScope/caches"><code>WorkerGlobalScope.caches</code></a> property in workers.</p> <div class="notecard note"> <p><strong>Note:</strong> <code>CacheStorage</code> always rejects with a <code>SecurityError</code> on untrusted origins (i.e. those that aren't using HTTPS, although this definition will likely become more complex in the future.) When testing on Firefox, you can get around this by checking the <strong>Enable Service Workers over HTTP (when toolbox is open)</strong> option in the Firefox DevTools options/gear menu. Furthermore, because <code>CacheStorage</code> requires file-system access, it may be unavailable in private mode in Firefox.</p> </div> <div class="notecard note"> <p><strong>Note:</strong> <a href="/en-US/docs/Web/API/CacheStorage/match"><code>CacheStorage.match()</code></a> is a convenience method. Equivalent functionality to match a cache entry can be implemented by returning an array of cache names from <a href="/en-US/docs/Web/API/CacheStorage/keys"><code>CacheStorage.keys()</code></a>, opening each cache with <a href="/en-US/docs/Web/API/CacheStorage/open"><code>CacheStorage.open()</code></a>, and matching the one you want with <a href="/en-US/docs/Web/API/Cache/match"><code>Cache.match()</code></a>.</p> </div></div><section aria-labelledby="instance_methods"><h2 id="instance_methods"><a href="#instance_methods">Instance methods</a></h2><div class="section-content"><dl> <dt id="cachestorage.match"><a href="/en-US/docs/Web/API/CacheStorage/match"><code>CacheStorage.match()</code></a></dt> <dd> <p>Checks if a given <a href="/en-US/docs/Web/API/Request"><code>Request</code></a> is a key in any of the <a href="/en-US/docs/Web/API/Cache"><code>Cache</code></a> objects that the <code>CacheStorage</code> object tracks, and returns a <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise"><code>Promise</code></a> that resolves to that match.</p> </dd> <dt id="cachestorage.has"><a href="/en-US/docs/Web/API/CacheStorage/has"><code>CacheStorage.has()</code></a></dt> <dd> <p>Returns a <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise"><code>Promise</code></a> that resolves to <code>true</code> if a <a href="/en-US/docs/Web/API/Cache"><code>Cache</code></a> object matching the <code>cacheName</code> exists.</p> </dd> <dt id="cachestorage.open"><a href="/en-US/docs/Web/API/CacheStorage/open"><code>CacheStorage.open()</code></a></dt> <dd> <p>Returns a <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise"><code>Promise</code></a> that resolves to the <a href="/en-US/docs/Web/API/Cache"><code>Cache</code></a> object matching the <code>cacheName</code> (a new cache is created if it doesn't already exist.)</p> </dd> <dt id="cachestorage.delete"><a href="/en-US/docs/Web/API/CacheStorage/delete"><code>CacheStorage.delete()</code></a></dt> <dd> <p>Finds the <a href="/en-US/docs/Web/API/Cache"><code>Cache</code></a> object matching the <code>cacheName</code>, and if found, deletes the <a href="/en-US/docs/Web/API/Cache"><code>Cache</code></a> object and returns a <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise"><code>Promise</code></a> that resolves to <code>true</code>. If no <a href="/en-US/docs/Web/API/Cache"><code>Cache</code></a> object is found, it resolves to <code>false</code>.</p> </dd> <dt id="cachestorage.keys"><a href="/en-US/docs/Web/API/CacheStorage/keys"><code>CacheStorage.keys()</code></a></dt> <dd> <p>Returns a <a href="/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise"><code>Promise</code></a> that will resolve with an array containing strings corresponding to all of the named <a href="/en-US/docs/Web/API/Cache"><code>Cache</code></a> objects tracked by the <code>CacheStorage</code>. Use this method to iterate over a list of all the <a href="/en-US/docs/Web/API/Cache"><code>Cache</code></a> objects.</p> </dd> </dl></div></section><section aria-labelledby="examples"><h2 id="examples"><a href="#examples">Examples</a></h2><div class="section-content"><p> This code snippet is from the MDN <a href="https://github.com/mdn/dom-examples/tree/main/service-worker/simple-service-worker" class="external" target="_blank">simple service worker example</a> (see <a href="https://bncb2v.csb.app/" class="external" target="_blank">simple service worker running live</a>.) This service worker script waits for an <a href="/en-US/docs/Web/API/ServiceWorkerGlobalScope/install_event" title="install"><code>install</code></a> event to fire, then runs <a href="/en-US/docs/Web/API/ExtendableEvent/waitUntil" title="waitUntil"><code>waitUntil</code></a> to handle the install process for the app. This consists of calling <a href="/en-US/docs/Web/API/CacheStorage/open"><code>CacheStorage.open</code></a> to create a new cache, then using <a href="/en-US/docs/Web/API/Cache/addAll"><code>Cache.addAll</code></a> to add a series of assets to it. </p> <p>In the second code block, we wait for a <a href="/en-US/docs/Web/API/FetchEvent"><code>FetchEvent</code></a> to fire. We construct a custom response like so:</p> <ol> <li>Check whether a match for the request is found in the CacheStorage. If so, serve that.</li> <li>If not, fetch the request from the network, then also open the cache created in the first block and add a clone of the request to it using <a href="/en-US/docs/Web/API/Cache/put"><code>Cache.put</code></a> (<code>cache.put(event.request, response.clone())</code>.)</li> <li>If this fails (e.g. because the network is down), return a fallback response.</li> </ol> <p>Finally, return whatever the custom response ended up being equal to, using <a href="/en-US/docs/Web/API/FetchEvent/respondWith"><code>FetchEvent.respondWith</code></a>.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>self.addEventListener("install", (event) => { event.waitUntil( caches .open("v1") .then((cache) => cache.addAll([ "/", "/index.html", "/style.css", "/app.js", "/image-list.js", "/star-wars-logo.jpg", "/gallery/bountyHunters.jpg", "/gallery/myLittleVader.jpg", "/gallery/snowTroopers.jpg", ]), ), ); }); self.addEventListener("fetch", (event) => { event.respondWith( caches.match(event.request).then((response) => { // caches.match() always resolves // but in case of success response will have value if (response !== undefined) { return response; } else { return fetch(event.request) .then((response) => { // response may be used only once // we need to save clone to put one copy in cache // and serve second one let responseClone = response.clone(); caches.open("v1").then((cache) => { cache.put(event.request, responseClone); }); return response; }) .catch(() => caches.match("/gallery/myLittleVader.jpg")); } }), ); }); </code></pre></div> <p>This snippet shows how the API can be used outside of a service worker context, and uses the <code>await</code> operator for much more readable code.</p> <div class="code-example"><div class="example-header"><span class="language-name">js</span></div><pre class="brush: js notranslate"><code>// Try to get data from the cache, but fall back to fetching it live. async function getData() { const cacheVersion = 1; const cacheName = `myapp-${cacheVersion}`; const url = "https://jsonplaceholder.typicode.com/todos/1"; let cachedData = await getCachedData(cacheName, url); if (cachedData) { console.log("Retrieved cached data"); return cachedData; } console.log("Fetching fresh data"); const cacheStorage = await caches.open(cacheName); await cacheStorage.add(url); cachedData = await getCachedData(cacheName, url); await deleteOldCaches(cacheName); return cachedData; } // Get data from the cache. async function getCachedData(cacheName, url) { const cacheStorage = await caches.open(cacheName); const cachedResponse = await cacheStorage.match(url); if (!cachedResponse || !cachedResponse.ok) { return false; } return await cachedResponse.json(); } // Delete any old caches to respect user's disk space. async function deleteOldCaches(currentCache) { const keys = await caches.keys(); for (const key of keys) { const isOurCache = key.startsWith("myapp-"); if (currentCache === key || !isOurCache) { continue; } caches.delete(key); } } try { const data = await getData(); console.log({ data }); } catch (error) { console.error({ error }); } </code></pre></div></div></section><h2 id="specifications"><a href="#specifications">Specifications</a></h2><table class="standard-table"><thead><tr><th scope="col">Specification</th></tr></thead><tbody><tr><td><a href="https://w3c.github.io/ServiceWorker/#cachestorage-interface">Service Workers <br/><small># cachestorage-interface</small></a></td></tr></tbody></table><h2 id="browser_compatibility"><a href="#browser_compatibility">Browser compatibility</a></h2><p>BCD tables only load in the browser<noscript> with JavaScript enabled. Enable JavaScript to view data.</noscript></p><section aria-labelledby="see_also"><h2 id="see_also"><a href="#see_also">See also</a></h2><div class="section-content"><ul> <li><a href="/en-US/docs/Web/API/Service_Worker_API/Using_Service_Workers">Using Service Workers</a></li> <li><a href="/en-US/docs/Web/API/Cache"><code>Cache</code></a></li> <li><a href="/en-US/docs/Web/API/Window/caches"><code>Window.caches</code></a> and <a href="/en-US/docs/Web/API/WorkerGlobalScope/caches"><code>WorkerGlobalScope.caches</code></a></li> <li><a href="/en-US/docs/Web/API/Web_Storage_API#private_browsing_incognito_modes">Private Browsing / Incognito modes</a></li> </ul></div></section></article><aside class="article-footer"><div class="article-footer-inner"><div class="svg-container"><svg xmlns="http://www.w3.org/2000/svg" width="162" height="162" viewBox="0 0 162 162" fill="none" role="none"><mask id="b" fill="#fff"><path d="M97.203 47.04c8.113-7.886 18.004-13.871 28.906-17.492a78 78 0 0 1 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Content available under <a href="/en-US/docs/MDN/Writing_guidelines/Attrib_copyright_license">a Creative Commons license</a>.</p></div></div></footer></div><script type="application/json" id="hydration">{"url":"/en-US/docs/Web/API/CacheStorage","doc":{"isMarkdown":true,"isTranslated":false,"isActive":true,"flaws":{},"title":"CacheStorage","mdn_url":"/en-US/docs/Web/API/CacheStorage","locale":"en-US","native":"English (US)","browserCompat":["api.CacheStorage"],"sidebarHTML":"<ol><li class=\"section\"><a href=\"/en-US/docs/Web/API/Service_Worker_API\">Service Worker API</a></li><li class=\"section\"><em><a href=\"/en-US/docs/Web/API/CacheStorage\" aria-current=\"page\"><code>CacheStorage</code></a></em></li><li class=\"toggle\"><details open=\"\"><summary>Instance methods</summary><ol><li><a href=\"/en-US/docs/Web/API/CacheStorage/delete\"><code>delete()</code></a></li><li><a href=\"/en-US/docs/Web/API/CacheStorage/has\"><code>has()</code></a></li><li><a href=\"/en-US/docs/Web/API/CacheStorage/keys\"><code>keys()</code></a></li><li><a href=\"/en-US/docs/Web/API/CacheStorage/match\"><code>match()</code></a></li><li><a href=\"/en-US/docs/Web/API/CacheStorage/open\"><code>open()</code></a></li></ol></details></li><li class=\"toggle\"><details open=\"\"><summary>Related pages for Service Workers API</summary><ol><li><a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a></li><li><a href=\"/en-US/docs/Web/API/Client\"><code>Client</code></a></li><li><a href=\"/en-US/docs/Web/API/Clients\"><code>Clients</code></a></li><li><a href=\"/en-US/docs/Web/API/ExtendableEvent\"><code>ExtendableEvent</code></a></li><li><a href=\"/en-US/docs/Web/API/ExtendableMessageEvent\"><code>ExtendableMessageEvent</code></a></li><li><a href=\"/en-US/docs/Web/API/FetchEvent\"><code>FetchEvent</code></a></li><li><a href=\"/en-US/docs/Web/API/InstallEvent\"><code>InstallEvent</code></a></li><li><a href=\"/en-US/docs/Web/API/NavigationPreloadManager\"><code>NavigationPreloadManager</code></a></li><li><a href=\"/en-US/docs/Web/API/Navigator/serviceWorker\"><code>Navigator.serviceWorker</code></a></li><li><a href=\"/en-US/docs/Web/API/ServiceWorker\"><code>ServiceWorker</code></a></li><li><a href=\"/en-US/docs/Web/API/ServiceWorkerContainer\"><code>ServiceWorkerContainer</code></a></li><li><a href=\"/en-US/docs/Web/API/ServiceWorkerGlobalScope\"><code>ServiceWorkerGlobalScope</code></a></li><li><a href=\"/en-US/docs/Web/API/ServiceWorkerRegistration\"><code>ServiceWorkerRegistration</code></a></li><li><a href=\"/en-US/docs/Web/API/Window/caches\"><code>Window.caches</code></a></li><li><a href=\"/en-US/docs/Web/API/WindowClient\"><code>WindowClient</code></a></li><li><a href=\"/en-US/docs/Web/API/WorkerGlobalScope/caches\"><code>WorkerGlobalScope.caches</code></a></li><li><a href=\"/en-US/docs/Web/API/WorkerNavigator/serviceWorker\"><code>WorkerNavigator.serviceWorker</code></a></li></ol></details></li></ol>","sidebarMacro":"APIRef","body":[{"type":"prose","value":{"id":null,"title":null,"isH3":false,"content":"<div class=\"notecard secure\"><p><strong>Secure context:</strong> This feature is available only in <a href=\"/en-US/docs/Web/Security/Secure_Contexts\">secure contexts</a> (HTTPS), in some or all <a href=\"#browser_compatibility\">supporting browsers</a>.</p></div><div class=\"notecard note\">\n <p><strong>Note:</strong> This feature is available in <a href=\"/en-US/docs/Web/API/Web_Workers_API\">Web Workers</a>.</p>\n</div>\n<p>The <strong><code>CacheStorage</code></strong> interface represents the storage for <a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a> objects.</p>\n<p>The interface:</p>\n<ul>\n <li>Provides a master directory of all the named caches that can be accessed by a <a href=\"/en-US/docs/Web/API/ServiceWorker\"><code>ServiceWorker</code></a> or other type of worker or <a href=\"/en-US/docs/Web/API/Window\"><code>window</code></a> scope (you're not limited to only using it with service workers).</li>\n <li>Maintains a mapping of string names to corresponding <a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a> objects.</li>\n</ul>\n<p>Use <a href=\"/en-US/docs/Web/API/CacheStorage/open\"><code>CacheStorage.open()</code></a> to obtain a <a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a> instance.</p>\n<p>Use <a href=\"/en-US/docs/Web/API/CacheStorage/match\"><code>CacheStorage.match()</code></a> to check if a given <a href=\"/en-US/docs/Web/API/Request\"><code>Request</code></a> is a key in any of the <a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a> objects that the <code>CacheStorage</code> object tracks.</p>\n<p>You can access <code>CacheStorage</code> through the <a href=\"/en-US/docs/Web/API/Window/caches\"><code>Window.caches</code></a> property in windows or through the <a href=\"/en-US/docs/Web/API/WorkerGlobalScope/caches\"><code>WorkerGlobalScope.caches</code></a> property in workers.</p>\n<div class=\"notecard note\">\n <p><strong>Note:</strong> <code>CacheStorage</code> always rejects with a <code>SecurityError</code> on untrusted origins (i.e. those that aren't using HTTPS, although this definition will likely become more complex in the future.) When testing on Firefox, you can get around this by checking the <strong>Enable Service Workers over HTTP (when toolbox is open)</strong> option in the Firefox DevTools options/gear menu. Furthermore, because <code>CacheStorage</code> requires file-system access, it may be unavailable in private mode in Firefox.</p>\n</div>\n<div class=\"notecard note\">\n <p><strong>Note:</strong> <a href=\"/en-US/docs/Web/API/CacheStorage/match\"><code>CacheStorage.match()</code></a> is a convenience method. Equivalent functionality to match a cache entry can be implemented by returning an array of cache names from <a href=\"/en-US/docs/Web/API/CacheStorage/keys\"><code>CacheStorage.keys()</code></a>, opening each cache with <a href=\"/en-US/docs/Web/API/CacheStorage/open\"><code>CacheStorage.open()</code></a>, and matching the one you want with <a href=\"/en-US/docs/Web/API/Cache/match\"><code>Cache.match()</code></a>.</p>\n</div>"}},{"type":"prose","value":{"id":"instance_methods","title":"Instance methods","isH3":false,"content":"<dl>\n <dt id=\"cachestorage.match\"><a href=\"/en-US/docs/Web/API/CacheStorage/match\"><code>CacheStorage.match()</code></a></dt>\n <dd>\n <p>Checks if a given <a href=\"/en-US/docs/Web/API/Request\"><code>Request</code></a> is a key in any of the <a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a> objects that the <code>CacheStorage</code> object tracks, and returns a <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise\"><code>Promise</code></a> that resolves to that match.</p>\n </dd>\n <dt id=\"cachestorage.has\"><a href=\"/en-US/docs/Web/API/CacheStorage/has\"><code>CacheStorage.has()</code></a></dt>\n <dd>\n <p>Returns a <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise\"><code>Promise</code></a> that resolves to <code>true</code> if a <a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a> object matching the <code>cacheName</code> exists.</p>\n </dd>\n <dt id=\"cachestorage.open\"><a href=\"/en-US/docs/Web/API/CacheStorage/open\"><code>CacheStorage.open()</code></a></dt>\n <dd>\n <p>Returns a <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise\"><code>Promise</code></a> that resolves to the <a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a> object matching the <code>cacheName</code> (a new cache is created if it doesn't already exist.)</p>\n </dd>\n <dt id=\"cachestorage.delete\"><a href=\"/en-US/docs/Web/API/CacheStorage/delete\"><code>CacheStorage.delete()</code></a></dt>\n <dd>\n <p>Finds the <a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a> object matching the <code>cacheName</code>, and if found, deletes the <a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a> object and returns a <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise\"><code>Promise</code></a> that resolves to <code>true</code>. If no <a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a> object is found, it resolves to <code>false</code>.</p>\n </dd>\n <dt id=\"cachestorage.keys\"><a href=\"/en-US/docs/Web/API/CacheStorage/keys\"><code>CacheStorage.keys()</code></a></dt>\n <dd>\n <p>Returns a <a href=\"/en-US/docs/Web/JavaScript/Reference/Global_Objects/Promise\"><code>Promise</code></a> that will resolve with an array containing strings corresponding to all of the named <a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a> objects tracked by the <code>CacheStorage</code>. Use this method to iterate over a list of all the <a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a> objects.</p>\n </dd>\n</dl>"}},{"type":"prose","value":{"id":"examples","title":"Examples","isH3":false,"content":"<p>\n This code snippet is from the MDN <a href=\"https://github.com/mdn/dom-examples/tree/main/service-worker/simple-service-worker\" class=\"external\" target=\"_blank\">simple service worker example</a> (see <a href=\"https://bncb2v.csb.app/\" class=\"external\" target=\"_blank\">simple service worker running live</a>.)\n This service worker script waits for an <a href=\"/en-US/docs/Web/API/ServiceWorkerGlobalScope/install_event\" title=\"install\"><code>install</code></a> event to fire, then runs <a href=\"/en-US/docs/Web/API/ExtendableEvent/waitUntil\" title=\"waitUntil\"><code>waitUntil</code></a> to handle the install process for the app. This consists of calling <a href=\"/en-US/docs/Web/API/CacheStorage/open\"><code>CacheStorage.open</code></a> to create a new cache, then using <a href=\"/en-US/docs/Web/API/Cache/addAll\"><code>Cache.addAll</code></a> to add a series of assets to it.\n</p>\n<p>In the second code block, we wait for a <a href=\"/en-US/docs/Web/API/FetchEvent\"><code>FetchEvent</code></a> to fire. We construct a custom response like so:</p>\n<ol>\n <li>Check whether a match for the request is found in the CacheStorage. If so, serve that.</li>\n <li>If not, fetch the request from the network, then also open the cache created in the first block and add a clone of the request to it using <a href=\"/en-US/docs/Web/API/Cache/put\"><code>Cache.put</code></a> (<code>cache.put(event.request, response.clone())</code>.)</li>\n <li>If this fails (e.g. because the network is down), return a fallback response.</li>\n</ol>\n<p>Finally, return whatever the custom response ended up being equal to, using <a href=\"/en-US/docs/Web/API/FetchEvent/respondWith\"><code>FetchEvent.respondWith</code></a>.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>self.addEventListener(\"install\", (event) => {\n event.waitUntil(\n caches\n .open(\"v1\")\n .then((cache) =>\n cache.addAll([\n \"/\",\n \"/index.html\",\n \"/style.css\",\n \"/app.js\",\n \"/image-list.js\",\n \"/star-wars-logo.jpg\",\n \"/gallery/bountyHunters.jpg\",\n \"/gallery/myLittleVader.jpg\",\n \"/gallery/snowTroopers.jpg\",\n ]),\n ),\n );\n});\n\nself.addEventListener(\"fetch\", (event) => {\n event.respondWith(\n caches.match(event.request).then((response) => {\n // caches.match() always resolves\n // but in case of success response will have value\n if (response !== undefined) {\n return response;\n } else {\n return fetch(event.request)\n .then((response) => {\n // response may be used only once\n // we need to save clone to put one copy in cache\n // and serve second one\n let responseClone = response.clone();\n\n caches.open(\"v1\").then((cache) => {\n cache.put(event.request, responseClone);\n });\n return response;\n })\n .catch(() => caches.match(\"/gallery/myLittleVader.jpg\"));\n }\n }),\n );\n});\n</code></pre></div>\n<p>This snippet shows how the API can be used outside of a service worker context, and uses the <code>await</code> operator for much more readable code.</p>\n<div class=\"code-example\"><div class=\"example-header\"><span class=\"language-name\">js</span></div><pre class=\"brush: js notranslate\"><code>// Try to get data from the cache, but fall back to fetching it live.\nasync function getData() {\n const cacheVersion = 1;\n const cacheName = `myapp-${cacheVersion}`;\n const url = \"https://jsonplaceholder.typicode.com/todos/1\";\n let cachedData = await getCachedData(cacheName, url);\n\n if (cachedData) {\n console.log(\"Retrieved cached data\");\n return cachedData;\n }\n\n console.log(\"Fetching fresh data\");\n\n const cacheStorage = await caches.open(cacheName);\n await cacheStorage.add(url);\n cachedData = await getCachedData(cacheName, url);\n await deleteOldCaches(cacheName);\n\n return cachedData;\n}\n\n// Get data from the cache.\nasync function getCachedData(cacheName, url) {\n const cacheStorage = await caches.open(cacheName);\n const cachedResponse = await cacheStorage.match(url);\n\n if (!cachedResponse || !cachedResponse.ok) {\n return false;\n }\n\n return await cachedResponse.json();\n}\n\n// Delete any old caches to respect user's disk space.\nasync function deleteOldCaches(currentCache) {\n const keys = await caches.keys();\n\n for (const key of keys) {\n const isOurCache = key.startsWith(\"myapp-\");\n if (currentCache === key || !isOurCache) {\n continue;\n }\n caches.delete(key);\n }\n}\n\ntry {\n const data = await getData();\n console.log({ data });\n} catch (error) {\n console.error({ error });\n}\n</code></pre></div>"}},{"type":"specifications","value":{"title":"Specifications","id":"specifications","isH3":false,"specifications":[{"bcdSpecificationURL":"https://w3c.github.io/ServiceWorker/#cachestorage-interface","title":"Service Workers"}],"query":"api.CacheStorage"}},{"type":"browser_compatibility","value":{"title":"Browser compatibility","id":"browser_compatibility","isH3":false,"query":"api.CacheStorage"}},{"type":"prose","value":{"id":"see_also","title":"See also","isH3":false,"content":"<ul>\n <li><a href=\"/en-US/docs/Web/API/Service_Worker_API/Using_Service_Workers\">Using Service Workers</a></li>\n <li><a href=\"/en-US/docs/Web/API/Cache\"><code>Cache</code></a></li>\n <li><a href=\"/en-US/docs/Web/API/Window/caches\"><code>Window.caches</code></a> and <a href=\"/en-US/docs/Web/API/WorkerGlobalScope/caches\"><code>WorkerGlobalScope.caches</code></a></li>\n <li><a href=\"/en-US/docs/Web/API/Web_Storage_API#private_browsing_incognito_modes\">Private Browsing / Incognito modes</a></li>\n</ul>"}}],"toc":[{"text":"Instance methods","id":"instance_methods"},{"text":"Examples","id":"examples"},{"text":"Specifications","id":"specifications"},{"text":"Browser compatibility","id":"browser_compatibility"},{"text":"See also","id":"see_also"}],"summary":"The CacheStorage interface represents the storage for Cache objects.","popularity":0.002,"modified":"2024-11-22T16:43:48.000Z","other_translations":[{"locale":"de","title":"CacheStorage","native":"Deutsch"},{"locale":"es","title":"CacheStorage","native":"Español"},{"locale":"fr","title":"CacheStorage","native":"Français"},{"locale":"ja","title":"CacheStorage","native":"日本語"},{"locale":"ru","title":"CacheStorage","native":"Русский"},{"locale":"zh-CN","title":"CacheStorage","native":"中文 (简体)"}],"pageType":"web-api-interface","source":{"folder":"en-us/web/api/cachestorage","github_url":"https://github.com/mdn/content/blob/main/files/en-us/web/api/cachestorage/index.md","last_commit_url":"https://github.com/mdn/content/commit/5f76b99045f87349ed030bbd6a3c2e43badb3c22","filename":"index.md"},"short_title":"CacheStorage","parents":[{"uri":"/en-US/docs/Web","title":"References"},{"uri":"/en-US/docs/Web/API","title":"Web APIs"},{"uri":"/en-US/docs/Web/API/CacheStorage","title":"CacheStorage"}],"pageTitle":"CacheStorage - Web APIs | MDN","noIndexing":false}}</script></body></html>