运行npm run dev报错的问题
1、按老师的要求打包报错，网上说我本地的webpack版本太高，改用命令
webpack hello.js -o hello.bundle.js
2、dev和build环境都配置完成之后，运行npm run dev报错，错误内容如下：
npm ERR! code ELIFECYCLE
npm ERR! errno 1
npm ERR! webpack-test@1.0.0 dev: `webpack --mode development`
npm ERR! Exit status 1
npm ERR!
npm ERR! Failed at the webpack-test@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\yi.lingyu\AppData\Roaming\npm-cache\_logs\2018-12-25T03_38_19_017Z-debug.log
