It would be nice to have web apps that work offline and send push notifications. This is now possible with Service Workers, which can add native-like functionality to your web apps without requiring a download. This book will get your mobile and web
Key Features Get straight into the action with step-by-step recipes that show you how to put Service Workers to work Find out what Service Workers can do for your app, then do it! Get the first in-depth look at this important new feature for web dev
Service Worker 是 Chrome 团队提出和力推的一个 WEB API，用于给 web 应用提供高级的可持续的后台处理能力。
service worker 能够操作的缓存是有别于浏览器内部的 memory cache 或者 disk cache。它是独立于当前页面的一段运行在浏览器后台进程里的脚本。大家可以把 Service Worker 理解为一个介于客户端和服务器之间的一个代理服务器。在 Service Worker 中我们可以做很多事情，比如拦截客户端的请求、向客户端发送消息
