npm install express --registry https://registry.npm.taobao.org
npm install set registry https://registry.npm.taobao.org
//配置后可通过下面方式验证是否成功
npm config get registry
或
npm info express
//安装cnpm
npm install -g cnpm --registry=https://registry.npm.taobao.org
//使用cnpm安装包
cnpm install express