参考链接：
https://www.jianshu.com/p/d12ec047ce52
https://www.jianshu.com/p/ba6358b1eec3
有demo：https://www.cnblogs.com/chaoyuehedy/p/8583272.html
demo链接：
https://github.com/CoderJackyHuang/WebViewJavascriptBridgeDemo