npm ERR! code ELIFECYCLE 后面一大串ERR的解决办法！！

npm run dev报错如下：

npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! [email protected] dev: `webpack-dev-server --inline --progress --config build/webpack.dev.conf.js`
npm ERR! Exit status 1
npm ERR! 
npm ERR! Failed at the [email protected] dev script.
npm ERR! This is probably not a problem with npm. There is likely additional logging output above.

npm ERR! A complete log of this run can be found in:
npm ERR!     /Users/soft/.npm/_logs/2019-11-13T07_36_00_166Z-debug.log

先查一下端口号有没有被占用，我也不知道咋查反正改了一个= =
原先是8080，我改成了8888
然后执行下面三步
npm install
npm run build
npm run dev

ps：我打的是cnpm，成功了，不行就都试试呗，万一呢