CacheStorage.keys()

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规范
浏览器兼容性
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keys () 方法在 CacheStorage interface returns a Promise that will resolve with an array containing strings corresponding to all of the named 缓存 objects tracked by the CacheStorage object in the order they were created. Use this method to iterate over a list of all 缓存 对象。

You can access CacheStorage through the global caches 特性。

句法

caches.keys().then(function(keyList) {
  //do something with your keyList
});

参数

None.

返回值

a Promise that resolves with an array of the 缓存 names inside the CacheStorage 对象。

范例

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 names of the caches we want to keep ( cacheWhitelist ). We return the keys of the caches in the CacheStorage 对象使用 keys() , then check each key to see if it is in the whitelist. If not, we delete it using CacheStorage.delete() .

then.addEventListener('activate', function(event) {
  var cacheWhitelist = ['v2'];
  event.waitUntil(
    caches.keys().then(function(keyList) {
      return Promise.all(keyList.map(function(key) {
        if (cacheWhitelist.indexOf(key) === -1) {
          return caches.delete(key);
        }
      });
    })
  );
});

规范

规范	状态	注释
服务工作者 The definition of 'CacheStorage: keys' in that specification.	工作草案	初始定义。

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`keys`	Chrome 40	Edge 16	Firefox 44 44 Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.	IE No	Opera 27	Safari 11.1	WebView Android 40	Chrome Android 40	Firefox Android 44	Opera Android 27	Safari iOS Yes	Samsung Internet Android 4.0

图例

完整支持
不支持
实验。期望将来行为有所改变。

另请参阅

元数据

最后修改： Jun 23, 2020

服务工作者 API
CacheStorage
方法
1. delete()
2. has()
3. keys()
4. match()
5. open()
Related pages for Service Workers API

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句法

参数

返回值

范例

规范

浏览器兼容性

图例

另请参阅

相关话题