extract-text-webpack-plugin@3.0.2 requires a peer of webpack@^3.1.0 but none is installed.
改：
"webpack": "^4.29.6"，"extract-text-webpack-plugin": "^4.0.0-beta.0"。
Version:
webpack： 4.29.6
vue: 3.5.3
虽然版本不一样，但是大致内容没有多大变化，里面有小坑，下面是插件安装顺序。
npm i webpack vue-loader
npm i acorn
npm install webpack-cli
npm i css-loader
npm i style-loader
npm i url-lodaer file-loader
npm i stylus-loader stylus
npm i webpack-dev-server
npm i cross-env
npm i html-webpack-plugin
