1、webpack编译打包Sass编译的css进js文件

cnpm install css-loader --save-dev    //css-loader 是将css打包进js

cnpm install style-loader --save-dev  //style-loader 将css通过require方式引入进来

cnpm install sass-loader node-sass  --save-dev //同时安装sass 和sass-loader

目录结构（publi为src编译生成的文件）

html代码

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta charset="utf-8">
    </head>
    <body>
            <div id="app">6r</div>
            <p id="demo">456</p>
    </body>
    <script type="text/javascript" src="public/js/index.js"></script> 
     <!-- assets是通过publicPath虚构出来的暂存空间，它不直接在硬盘内存中，通过webpack-dev-server来运行 -->
</html>

index.scss

$col:pink;
@import "./demo"; //导入css
body{
 font-size: 900%;
  #app{color:$col;}
}

demo.css

  #demo{color:blue;}

index.js

var $ = require('../../node_modules/jquery');
//loader-css
require("../css/index.scss"); 

$('#app').html("1334");
$("#app").click(function(event){
        alert(123)
    });

webpack.config.js

var webpack = require("webpack");
var webpckDevServer  = require("webpack-dev-server");

module.exports={
    entry: __dirname +"/src/js/index.js",//入口文件 webpack-dev-server 实时刷新监控的目录
    output:{
        path: __dirname +"/public/", 

        filename: "js/index.js",
        publicPath: '/assets/'//打开webpack-dev-server 服务器工具时可以再index里面引用此地址，打开速度会快一点,另外他不是直接在内存中存放而是先在webpack的虚拟内存中暂存,所以在webpack未编译之前能够运行，如果直接写实体目录则不经过webpack打包编译，浏览器是识别不了的，所以先放在这个虚拟目录里，因为是虚拟目录，所以你看不到他的编译文件
    },
    devServer:{
        contentBase:"./",//根目录
        host:'192.168.199.171',//ip设置 要相对的进行改变
        port:"80",//端口
        colors:true,
        open:true//自动打开浏览器   
    },
    module:{
        loaders:[
            {  test:/\.css$/,//匹配.css文件
               loader:'style-loader!css-loader'//用style-loader去解释css
            },
             {
                test: /\.scss$/,
                loaders: ["style-loader", "css-loader", "sass-loader"]
            }     
        ] 
    }
}

package.json

{
  "name": "webp2",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "www": "cnpm run demo && cnpm run devServer",
    "demo": "webpack --watch --progress -d -p --color",
    "demo2": "webpack --config webpack.config123.js --watch --progress -d -p --color",
    "start": "webpack --watch --progress -d -p --color",
    "devServer": "webpack-dev-server --inline --hot"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "css-loader": "^0.26.1",
    "jquery": "^3.1.1","node-sass": "^4.0.0",
    "sass-loader": "^4.1.0",
    "style-loader": "^0.13.1",
    "webpack": "^1.14.0",
    "webpack-dev-server": "^1.16.2"
  }
}