设置淘宝镜像命令：npm config set registry https://registry.npm.taobao.org
查看当前镜像地址命令：npm config get registry
成功显示了所设置的地址，代表成功更换镜像地址，国内常用的镜像地址：
npm -------- https://registry.npmjs.org/
yarn ------- https://registry.yarnpkg.com/
cnpm ------- http://r.cnpmjs.org/
taobao ----- https://registry.npm.taobao.org/
nj --------- https://registry.nodejitsu.com/
npmMirror -- https://skimdb.npmjs.com/registry/
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