CacheStorage.open()

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open() 方法在 CacheStorage interface returns a Promise that resolves to the 缓存 object matching the cacheName .

You can access CacheStorage through the global caches 特性。

注意 : If the specified 缓存 does not exist, a new cache is created with that cacheName 和 Promise that resolves to this new 缓存 object is returned.

句法

caches.open(cacheName).then(function(cache) {
  // Do something with your cache
});

参数

cacheName

返回值

A Promise that resolves to the requested 缓存 对象。

范例

This example is from the MDN sw-test example (见 sw-test running live ). Here we wait for an InstallEvent to fire, then runs waitUntil() to handle the install process for the app. This consists of calling CacheStorage.open() to create a new cache, then using Cache.addAll() to add a series of assets to it.

self.addEventListener('install', function(event) {
  event.waitUntil(
    caches.open('v1').then(function(cache) {
      return cache.addAll([
        '/sw-test/',
        '/sw-test/index.html',
        '/sw-test/style.css',
        '/sw-test/app.js',
        '/sw-test/image-list.js',
        '/sw-test/star-wars-logo.jpg',
        '/sw-test/gallery/bountyHunters.jpg',
        '/sw-test/gallery/myLittleVader.jpg',
        '/sw-test/gallery/snowTroopers.jpg'
      ]);
    })
  );

规范

规范	状态	注释
服务工作者 The definition of 'CacheStorage: open' 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
`open`	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。

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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