nrm注册管理器
nrm可以帮助你不同的NPM登记之间方便，快捷开关。
安装
$ npm install -g nrm例
$ nrm ls
* npm ----- https://registry.npmjs.org/
yarn ----- https://registry.yarnpkg.com
cnpm ---- http://r.cnpmjs.org/
taobao -- https://registry.npm.taobao.org/
nj ------ https://registry.nodejitsu.com/
skimdb -- https://skimdb.npmjs.com/registry
$ nrm use cnpm //switch registry to cnpm
Registry has been set to: http://r.cnpmjs.org/