npm

npm install 安装依赖

npm run dev  编译js,css等

npm run production 优化

npm run watch-poll 监听（相当于前两句的合并）

npm verufy cache 清楚缓存

npm config set registry "https://registry.npmjs.com/"  设置npm的下载源

npm install --ignore-engines  忽略版本安装依赖

问题：

npm ERR! Response timeout while trying to fetch https://registry.npmjs.org/react-is (over 30000ms)

Sounds like you have a slow connection. Try increasing the timeout from 30s to 60s by adding this to your .npmrc file:（ C:UsersAdministrator.npmrc）

timeout=60000

You could also try adding

prefer-offline=true

npm install时报以下错误

Error: EPERM: operation not permitted, unlink 'E:phpstudy_proWWWminisoapi2 ode_modules.node-sass.DELETEvendorwin32-x64-57inding.node'
npm ERR! errno: -4048,
npm ERR! code: 'EPERM',
npm ERR! syscall: 'unlink',

yarn install --ignore-engine  可以解决以上问题，前提是已经安装了yarn

npm安装时有报错问题可以到这里查看https://www.e-learn.cn/tag/npm-install