caches 是一个 ServiceWorkerGlobalScope 接口的只读属性，返回与当前service worker相关联的CacheStorage对象。
语法
var myCacheStorage = self.caches;
返回值
一个 CacheStorage 对象。
规范
| 规范 | 状态 | 备注 |
|---|---|---|
| Service Workers ServiceWorkerGlobalScope.caches |
Working Draft | Initial definition. |
浏览器兼容性
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