npm run dev 起不来报错，不要慌，看这里。

(meiduo_admin) python@ubuntu:~/Desktop/meiduo_admin/meiduo_admin/meiduo_mall_admin$ npm run dev

> [email protected] dev /home/python/Desktop/meiduo_admin/meiduo_admin/meiduo_mall_admin
> webpack-dev-server --inline --progress --config build/webpack.dev.conf.js

sh: 1: webpack-dev-server: Permission denied
npm ERR! code ELIFECYCLE
npm ERR! errno 126
npm ERR! [email protected] dev: `webpack-dev-server --inline --progress --config build/webpack.dev.conf.js`
npm ERR! Exit status 126
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!     /home/python/.npm/_logs/2019-06-03T10_23_35_355Z-debug.log

npm run dev 起不来，在命令终端输入npm audit fix，重新输入即可

然后继续运行npm run dev

另外一种解决办法：这是新版webpack存在的BUG，装老版本就好。

1、npm uninstall webpack-dev-server

2、npm install [email protected]

3、npm run dev