1.安装sass依赖包

npm  install sass-loader --save-dev
npm install node-sass --sava-dev 

2.测试是否可用

<template>
  <div class="navbar">
    导航栏
  </div>
</template>

<script>
export default {
  name: 'NavBar'
}
</script>

<style lang="scss" scoped>
$col:red;

.navbar{
  color: $col;
}
</style>