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/