1，npm install和cnpm install时的不同
https://blog.csdn.net/csm0912/article/details/90264026
2，npm设置和查看仓库源
https://www.cnblogs.com/wenjunwei/p/10078460.html
使用nrm管理registry地址 a.下载nrm npm install -g nrm b.添加registry地址 nrm add npm http://registry.npmjs.org nrm add taobao https://registry.npm.taobao.org c.切换npm registry地址 nrm use taobao nrm use npm
3，todo output