搭建react脚手架时
    npm install create-react-app -g
    create-react-app antm-demo
    报错如下：error Received malformed response from registry for undefined. The registry
	may be down
    解决方案:
    npm config set registry https://registry.npm.taobao.org 
    npm config set disturl https://npm.taobao.org/dist