1.首先执行以下命令安装 style-resources-loader;

vue add style-resources-loader

2.然后安装scss/sass,node-sass sass-loader sass 属于重要依赖，所以需-D而不是-S；

npm install node-sass sass-loader sass -D

3.根路径下建立文件vue.config.js

const path = require('path');
module.exports = {
    pluginOptions: {
      'style-resources-loader': {
        preProcessor: 'scss',
        patterns: []
      }
    }
}

4.调用test

<style lang="scss" scoped>
$bg: red;
.container {
  background-color: $bg;
}
</style>