npm install -g package --registry=https://registry.npmmirror.com/

npm install -g cnpm --registry=https://registry.npmmirror.com/

$ npm get registry #查看原本镜像
$ npm config set registry http://registry.npmmirror.com/ #修改成淘宝镜像
$ npm config set registry https://registry.npmjs.org/ #镜像还原