查看当前使用的那个镜像
nrm ls
npm ---------- https://registry.npmjs.org/
yarn --------- https://registry.yarnpkg.com/
cnpm --------- https://r.cnpmjs.org/
taobao ------- https://registry.npmmirror.com/
切换镜像
nrm use taobao如果还不行试试，官方镜像
npm set registry https://registry.npmjs.org/
