错误重现

项目名称是blog01，项目目录结构如下：

blog01
  │
  ├─src
  │    ├─App.vue
  │    ├─home.vue
  │    ├─main.js
  │    └─router.js
  │
  ├─.babelrc
  ├─index.template.html
  ├─package.json
  └─webpack.config.js

App.vue

<template>
  <div>
    <router-view></router-view>
  </div>
</template>
<script>
export default {
}
</script>

home.vue

<template>
    <div class="home-wrapper">
        <span class="my-style">这里是首页</span>
    </div>
</template>
<style lang="sass" rel="stylesheet/scss" scoped>
.home-wrapper{
    .my-style{
        width:900px;
        height:600px;
        float:right;margin-right:200px;
        padding-top:100px;
        color:#FF0000;
    }
}
</style>

main.js

import Vue from 'vue'
import App from './App.vue'
import VueRouter from 'vue-router'
import routes from './router'
import VueSuperagent from 'vue-superagent'
import 'babel-polyfill';

Vue.use(VueRouter);
Vue.use(VueSuperagent);

const router = new VueRouter({
  mode: 'history',
  routes
})

new Vue({
  el: '#app',
  router,
  render: h => h(App)
})

router.js

import Home from './home.vue'

export default [{
    path:'/',
    component:Home
}]

.babelrc

{
  "presets": [
    ["latest", {
      "es2015": { "modules": false }
    }]
  ]
}

index.template.html

<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <title>blog01</title>
  </head>
  <body>
    <div id="app">
      <router-view></router-view>
    </div>
    <!--<script src="/dist/[name].[chunkhash].js"></script>-->
  </body>
</html>

package.json

{
    "name": "blog01",
    "description": "CSDN blog01",
    "version": "1.0.0",
    "author": "",
    "private": true,
    "scripts": {
        "dev": "cross-env NODE_ENV=development webpack-dev-server --open --hot",
        "build": "rimraf dist && cross-env NODE_ENV=production webpack --progress --hide-modules"
    },
    "dependencies": {
        "babel-polyfill": "^6.23.0",
        "vue": "^2.2.1",
        "vue-router": "^2.3.0",
        "vue-superagent": "^1.2.0"
    },
    "devDependencies": {
        "babel-core": "^6.0.0",
        "babel-loader": "^6.0.0",
        "babel-preset-latest": "^6.0.0",
        "cross-env": "^3.0.0",
        "css-loader": "^0.25.0",
        "file-loader": "^0.9.0",
        "html-webpack-plugin": "^2.28.0",
        "node-sass": "^4.5.0",
        "rimraf": "^2.6.1",
        "sass-loader": "^5.0.1",
        "url-loader": "^0.5.8",
        "vue-loader": "^11.1.4",
        "vue-template-compiler": "^2.2.1",
        "webpack": "^2.2.0",
        "webpack-dev-server": "^2.2.0"
    }
}

webpack.config.js

var path = require('path')
var webpack = require('webpack')
const HTMLPlugin = require('html-webpack-plugin')

module.exports = {
  entry: {
        app: ['./src/main.js'],
        // 把共用的库放到vendor.js里
        vendor: [
            'babel-polyfill',
            'vue',
            'vue-router',
            'vuex'
        ]
    },
  output: {
    path: path.resolve(__dirname, './dist'),

    // 因为用到了 html-webpack-plugin 处理HTML文件。处理后的HTML文件都放到了
    // dist文件夹里。html文件里面js的相对路径应该从使用 html-webpack-plugin 前
    // 的'/dist/' 改成 '/'
    publicPath: '/',
    // publicPath: '/dist/',
    filename: '[name].[hash].js'
    // filename:'build.js'
  },
  module: {
    rules: [
      {
        test: /\.vue$/,
        loader: 'vue-loader',
        options: {
          loaders: {
            // Since sass-loader (weirdly) has SCSS as its default parse mode, we map
            // the "scss" and "sass" values for the lang attribute to the right configs here.
            // other preprocessors should work out of the box, no loader config like this necessary.
            'scss': 'vue-style-loader!css-loader!sass-loader',
            'sass': 'vue-style-loader!css-loader!sass-loader?indentedSyntax'
          }
          // other vue-loader options go here
        }
      },
      {
        test: /\.js$/,
        loader: 'babel-loader',
        exclude: /node_modules/
      },
      // font loader
      {
        test: /\.(ttf|eot|woff|svg)$/i,
        loader: 'url-loader'
      },
      // 图片处理
      {
        test: /\.(png|jpg|gif)$/,
        loader: 'url-loader',
        options: {
          limit: '1000',
          name: '[name].[ext]?[hash]'
        }
      }
    ]
  },
  plugins:[
    // 把共用的库放到vendor.js里
    new webpack.optimize.CommonsChunkPlugin({name: 'vendor'}),
    // 编译HTML。目的：在生产环境下，为了避免浏览器缓存，需要文件按照哈希值重命名。
    // 这里编译可以自动更改每次编译后引用的js名称。
    new HTMLPlugin({template: 'index.template.html'})
  ],
  resolve: {
    alias: {
      'vue$': 'vue/dist/vue.esm.js'
    }
  },
  devServer: {
    historyApiFallback: true,
    noInfo: true
  },
  performance: {
    hints: false
  },
  devtool: '#eval-source-map'
}

if (process.env.NODE_ENV === 'production') {
  module.exports.devtool = '#source-map'
  // http://vue-loader.vuejs.org/en/workflow/production.html
  module.exports.plugins = (module.exports.plugins || []).concat([
    new webpack.DefinePlugin({
      'process.env': {
        NODE_ENV: '"production"'
      }
    }),
    new webpack.optimize.UglifyJsPlugin({
      sourceMap: true,
      compress: {
        warnings: false
      }
    }),
    new webpack.LoaderOptionsPlugin({
      minimize: true
    })
  ])
}

解决方法

这个问题涉及到 sass 和 scss 的区别。sass 的语法规则是一种缩进语法。而 scss 语法与 css 语法相近，使用大括号。上面那个例子中，home.vue 文件中的 style 标签，lang 属性设置成了 sass，代码如下：

<style lang="sass" rel="stylesheet/scss" scoped>

然而 style 标签里面的内容是scss，这导致了编译器报错。所以为了解决这个问题，需要把上面的代码改成如下形式：

<style lang="scss" rel="stylesheet/scss" scoped>

lang 属性变成 scss，所有关于语法的地方都设置成 scss，这样问题就解决了。

# sass # scss # 前端
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