全局安装
npm i nrm -g 全局安装nrm
nrm ls 查看镜像地址：
npm ---- https://registry.npmjs.org/
cnpm --- http://r.cnpmjs.org/
taobao - https://registry.npm.taobao.org/
nj ----- https://registry.nodejitsu.com/
rednpm - http://registry.mirror.cqupt.edu.cn/
npmMirror https://skimdb.npmjs.com/registry/
edunpm - http://registry.enpmjs.org/
nrm use taobao 使用淘宝的镜像
$ nrm use taobao Registry has been set to: https://registry.npm.taobao.org/ Administrator@LiYong-PC MINGW64 /d/phpStudy/PHPTutorial/WWW/node
使用cnpm。
npm i cnpm -g