npm切换源

配置格式：

npm config set registry URL

如：切换到淘宝镜像：

npm config set registry https://registry.npmmirror.com

相关源：

npm ---- https://registry.npmjs.org/
cnpm --- http://r.cnpmjs.org/
taobao - https://registry.npmmirror.com
edunpm - http://registry.enpmjs.org/
eu ----- http://registry.npmjs.eu/
au ----- http://registry.npmjs.org.au/
sl ----- http://npm.strongloop.com/
nj ----- https://registry.nodejitsu.com/
pt ----- http://registry.npmjs.pt/

查看配置源：

npm config get registry