npm	https://registry.npmjs.org/ https://registry.yarnpkg.com/ https://mirrors.cloud.tencent.com/npm/ https://r.cnpmjs.org/ https://registry.npm.taobao.org/ https://registry.nodejitsu.com/ https://skimdb.npmjs.com/registry/ https://registry.npmjs.eu/ https://npm.strongloop.com/