npm install --save-dev sass-loader

//sass-loader依赖于node-sass
npm install --save-dev node-sass

{ 
 test: /\.sass$/, 
 loaders: ['style', 'css', 'sass'] 
} 

<span style="color:#454545;">// module用来解析不同的模块
 module: {
  rules: [
   ...(config.dev.useEslint "color:#ff0000;">{
      test: /\.sass$/,
      loaders: ['style', 'css', 'sass']
    }</span><span style="color:#454545;">
  ]
 },</span>

<style lang="scss">

<template>
  <div id="indexContent">
    <v-header></v-header>
    <div class="tab">
      <div class="tab-item">
        <!-- 使用 router-link 组件来导航. -->
        <!-- 通过传入 `to` 属性指定链接. -->
        <!-- <router-link> 默认会被渲染成一个 `<a>` 标签 -->
        <router-link to="/foods">商品</router-link>
      </div>
      <div class="tab-item">
        <router-link to="/rating">评论</router-link>
      </div>
      <div class="tab-item">
        <router-link to="/seller">商家</router-link>
      </div>
    </div>
    <!-- 路由出口 -->
    <!-- 路由匹配到的组件将渲染在这里 -->
    <router-view></router-view>
  </div>
</template>
<script type="text/ecmascript-6">
  import header from './components/header/header.vue';
  // 加default表示对整个模块进行导出
  export default{
    components: {
      'v-header': header
    }
  };
</script>
<span style="color:#cc0000;"><style lang="scss"></span>
  #indexContent {
    .tab{
      display: flex;
      width:100%;
      height: 40px;
      line-height: 40px;
      .tab-item {
        flex: 1;
        text-align: center;
        a{
          display:block;
        }
      }
    }
  }
</style>