常用命令
npm config set registry https://registry.npm.taobao.org/# 淘宝源
npm config set registry https://r.cnpmjs.org/# cnpm 源
npm config set registry https://registry.npmjs.org/# 官方源
npm who am i# 检查当前用户
npm login# 登录
npm publish [包名]# 发布包
npm run [scripts]# 运行 script
npm install [module]# 安装包