Clients.get()

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。

Clients 接口的 get() 方法获取给定 id 匹配的Service Worker client，并在 Promise 中返回它.

语法

self.clients.get(id).then(function(client) {
  // do something with your returned client
});

一个resolve为 Client 对象的 Promise .

self.clients.get(options).then(function(client) {    
  self.clients.openWindow(client.url);   
});

Specification	Status	Comment
Service Workers get()	Working Draft	Initial definition

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`get` Experimental	Chrome Full support 51	Edge ?	Firefox Full support 45 Notes Full support 45 Notes Notes Service workers (and Push) have been disabled in the Firefox 45 & 52 Extended Support Releases (ESR).	IE No support No	Opera Full support 38	Safari No support No	WebView Android No support No	Chrome Android Full support 51	Firefox Android Full support 45	Opera Android Full support 41	Safari iOS No support No	Samsung Internet Android Full support 5.0

Full support: Full support
No support: No support
Compatibility unknown: Compatibility unknown
Experimental. Expect behavior to change in the future.: Experimental. Expect behavior to change in the future.
See implementation notes.: See implementation notes.