Aspect Oriented Programming(AOP) . Don't change javascript any code. All code write in native. Main idea:
1.rewrite the console.log method of javascript. 2.iOS native code injected the method when H5 starts to create the DOM tree.
pod 'SKJavaScriptBridge', '~> 1.0.1'
If native want to get console.log in WKWebView just
[WKWebView enableLogging:LogginglevelAll]; is enough.
Newer Demo https://github.com/housenkui/WebViewJavascriptBridge