1.安装scss所需要的安装包

cnpm install node-sass sass-loader style-loader -S

2.在vue.config.js中配置

pluginOptions: {
      'style-resources-loader': {
          preProcessor: 'scss',
          patterns: []
      }
  }

const { defineConfig } = require('@vue/cli-service')
module.exports = defineConfig({
  transpileDependencies: true,
  runtimeCompiler: true,
  pluginOptions: {
      'style-resources-loader': {
          preProcessor: 'scss',
          patterns: []
      }
  }
})

3.重启项目