原始源

# the original source
https://registry.npmjs.org/

方案: 使用nrm

npm install -g nrm
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/
  npmMirror -- https://skimdb.npmjs.com/registry/
  edunpm ----- http://registry.enpmjs.org/

方案: 改变全局的注册

//设置成淘宝源
npm config set registry https://registry.npm.taobao.org
//查看结果
npm config get registry
//输出结果：
https://registry.npm.taobao.org/
//测试一下
npm info underscore

方案: 在命令行里指定源

npm --registry https://registry.npm.taobao.org install [name]

方案: 修改 ~/.npmrc

registry = https://registry.npm.taobao.org

方案: 使用cnpm

npm install -g cnpm --registry=https://registry.npm.taobao.org
cnpm install [name]