安装bower
Administrator@USER-20170614OK MINGW64 ~/scott/imooc
$ npm install -g bower
npm WARN deprecated bower@1.8.2: ...psst! Your project can stop working at any moment because its dependencies can change. Prevent this by migrating to Yarn: https://bower.io/blog/2017/how-to-migrate-away-from-bower/ 这个错误怎么办啊