项目已经搭建，需要添加stylus

1. cmd， 进入项目所在目录， 输入vue add style-resources-loader (或 npm i vue-cli-plugin-style-resources-loader)
2. vue.config.js中，修改.styl文件所在目录

// vue.config.js详情const path = require('path');module.exports = {  pluginOptions: {    'style-resources-loader': {      preProcessor: 'stylus',      patterns: [        // path.resolve(__dirname, 'src/styles/abstracts/*.styl'),        path.resolve(__dirname, 'src/assets/styles/index.styl'),      ],    }  }