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The delete() method of the CacheStorage interface finds the Cache object matching the cacheName, and if found, deletes the Cache object and returns a Promise that resolves to true. If no Cache object is found, it returns false.


caches.delete(cacheName).then(function(true) {
  //your cache is now deleted


a Promise that resolves to true if the Cache object is found and deleted, and false otherwise.


The name of the cache you want to delete.


In this code snippet we wait for an activate event, and then run a waitUntil() block that clears up any old, unused caches before a new service worker is activated. Here we have a whitelist containing the name of the cache we want to keep. We return the keys of the caches in the CacheStorage object using CacheStorage.keys, then check each key to see if it is in the whitelist. If not, we delete it using delete().

this.addEventListener('activate', function(event) {
  var cacheWhitelist = ['v2'];

    caches.keys().then(function(keyList) {
      return Promise.all(keyList.map(function(key) {
        if (cacheWhitelist.indexOf(key) === -1) {
          return caches.delete(key);


Specification Status Comment
Service Workers
Working Draft Initial definition.

Browser compatibility

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari
Basic support 40.0 44 (44)[1] 未实现 ? 未实现
Feature Android Android Webview Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support 未实现 未实现 44.0 (44) (Yes) (Yes) (Yes) 40.0

[1] Service workers (and Push) have been disabled in the Firefox 45 & 52 Extended Support Releases (ESR.)

See also


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