使用nrm或yrm切换npm国内镜像

npm install -g nrm
nrm ls
#显示如下
npm ---------- https://registry.npmjs.org/
yarn --------- https://registry.yarnpkg.com/
tencent ------ https://mirrors.cloud.tencent.com/npm/
cnpm --------- https://r.cnpmjs.org/
taobao ------- https://registry.npmmirror.com/
npmMirror ---- https://skimdb.npmjs.com/registry/
#选择tencent
nrm use tencent

npm install -g yrm
yrm ls
#显示如下
npm ---- https://registry.npmjs.org/
cnpm --- http://r.cnpmjs.org/
taobao - https://registry.npm.taobao.org/
nj ----- https://registry.nodejitsu.com/
rednpm - http://registry.mirror.cqupt.edu.cn/
npmMirror  https://skimdb.npmjs.com/registry/
edunpm - http://registry.enpmjs.org/
yarn --- https://registry.yarnpkg.com

#测试速度
yrm test taobao
taobao - 271ms