npm国内源切换

//npm国内源切换
//配置切换到淘宝源
 npm config set registry https://registry.npm.taobao.org
//使用淘宝cnpm
 npm i -g cnpm
 //检测是否切换到了淘宝源
npm info underscore

gitHead: 'e4743ab712b8ab42ad4ccb48b155034d02394e4d',
  dist: 
   { shasum: '4f3fb53b106e6097fcf9cb4109f2a5e9bdfa5022',
     size: 34172,
     noattachment: false,
     //有registry.npm.taobao.org等字样说明切换成功
     tarball: 'http://registry.npm.taobao.org/underscore/download/underscore-1.8.3.tgz' },
  directories: {},
  publish_time: 1427988774520 }