npm config delete registry
npm config delete disturl

或者 
npm config edit 
找到淘宝那两行,删除

手动的太麻烦了，一般用 https://www.npmjs.com/package/nrm 做切换

$ nrm ls
 
* npm ---- https://registry.npmjs.org/
  cnpm --- http://r.cnpmjs.org/
  taobao - http://registry.npm.taobao.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/