PushManager.supportedContentEncodings

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。

PushManager的只读方法 supportedContentEncodings 返回一组支持内容编码，可以用在加密信息中发送的消息。

语法

var encodings[] = PushManager.supportedContentEncodings

一个字符串数组

说明	状态	注释
Push API supportedContentEncodings	Working Draft	最初的定义

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Edge Mobile	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
`supportedContentEncodings` Experimental	Chrome Full support 60	Edge Full support 16 Disabled Full support 16 Disabled Disabled From version 16: this feature is behind the `Enable service workers` preference. Full support 17	Firefox Full support 44 Notes Full support 44 Notes Notes Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR.)	IE No support No	Opera Full support 47	Safari No support No	WebView Android No support No	Chrome Android Full support 60	Edge Mobile Full support Yes	Firefox Android Full support 48 Notes Full support 48 Notes Notes Push enabled by default.	Opera Android Full support 44	Safari iOS No support No	Samsung Internet Android Full support 4.0

Full support: Full support
No support: No support
Experimental. Expect behavior to change in the future.: Experimental. Expect behavior to change in the future.
See implementation notes.: See implementation notes.
User must explicitly enable this feature.: User must explicitly enable this feature.