Cache.addAll()

Experimental: 这是一个实验中的功能
此功能某些浏览器尚在开发中，请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订，所以在未来版本的浏览器中该功能的语法和行为可能随之改变。

概要

Cache 接口的 addAll() 方法接受一个 URL 数组，检索它们，并将生成的 response 对象添加到给定的缓存中。在检索期间创建的 request 对象成为存储的 response 操作的 key。

备注： addAll() will overwrite any key/value pairs previously stored in the cache that match the request, but will fail if a resulting put() operation would overwrite a previous cache entry created by the same addAll() method.

备注： Initial Cache implementations (in both Blink and Gecko) resolve Cache.add, Cache.addAll, and Cache.put promises when the response body is fully written to storage. More recent spec versions have newer language stating that the browser can resolve the promise as soon as the entry is recorded in the database even if the response body is still streaming in.

语法

cache.addAll(requests[]).then(function() {
  //requests have been added to the cache
});

参数

requests

要获取并添加到缓存的字符串 URL 数组。

返回值

A Promise that resolves with void.

Exceptions

Exception Happens when
TypeError The URL scheme is not http or https.The Response status is not in the 200 range (i.e., not a successful response.) This occurs if the request does not return successfully, but also if the request is a cross-origin no-cors request (in which case the reported status is always 0.)

示例

此代码块等待一个 InstallEvent 事件触发，然后运行 waitUntil 来处理该应用程序的安装进程。包括调用 CacheStorage.open 创建一个新的 cache，然后使用 addAll() 添加一系列资源。

this.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/',
        '/sw-test/gallery/bountyHunters.jpg',
        '/sw-test/gallery/myLittleVader.jpg',
        '/sw-test/gallery/snowTroopers.jpg'
      ]);
    })
  );
});

规范

Specification
Service Workers
# cache-addAll

浏览器兼容性

BCD tables only load in the browser

参见