1、卸载npm

 sudo npm uninstall npm -g

2、卸载node

 sudo rm -rf /usr/local/lib/node /usr/local/lib/node_modules /var/db/receipts/org.nodejs.*
 sudo rm -rf /usr/local/include/node /Users/$USER/.npm 
 sudo rm /usr/local/bin/node 
 sudo rm /usr/local/share/man/man1/node.1
 sudo rm /usr/local/lib/dtrace/node.d

3、安装淘宝镜像

sudo npm install -g cnpm --registry=https://registry.npm.taobao.org --verbose