解决vue项目运行过程中，npm run dev 报错问题

ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! metools@1.0.0 dev: `node build/dev-server.js`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the metools@1.0.0 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!     C:\Users\think\AppData\Roaming\npm-cache\_logs\2018-03-29T02_46_46_622Z-debug.log

这个是报 的错误，原因是 webpack 的新版本的BUG，解决方法就是卸载新版本，安装老版本
命令：

npm remove webpack-dev-server
npm install webpack-dev-server@2.9.1
npm run dev