js压缩和打包

https://simmin.github.io/2017/03/31/js-css-compress/

http://www.cnblogs.com/hubcarl/p/4095122.html

http://blog.fens.me/nodejs-uglifyjs2-js/

https://www.mxgw.info/a/uglify_drop_console_for_ie.html

https://my.oschina.net/powerwind/blog/732591