设置代理
npm config set proxy=http://127.0.0.1:8087
npm config set registry=http://registry.npmjs.org

关于https
经过上面设置使用了http开头的源，因此不需要设https_proxy了，否则还要增加一句:

npm config set https-proxy http://server:port

代理用户名和密码
npm config set proxy http://username:password@server:port
npm confit set https-proxy http://username:password@server:port

取消代理
npm config delete proxy
npm config delete https-proxy