Webpack 搭建开发环境

//初始化一个项目
npm init 

//安装webpack到开发环境中
npm install --save-dev webpack

//安装 webpack-dev-server
npm install --save-dev webpack-dev-server

//安装基础 loader
npm install --save-dev style-loader css-loader url-loader sass-loader node-sass babel-loader babel-core

//安装 html-webpack-plugin 插件 生成自动引用打包资源文件的静态页面
npm install --save-dev html-webpack-plugin

//安装 extract-text-webpack-plugin 插件 单独打包CSS
npm install --save-dev extract-text-webpack-plugin

创建配置文件 webpack.config.js

const path=require('path')
const HtmlWebpackPlugin=require('html-webpack-plugin')
const ExtractTextPlugin=require('extract-text-webpack-plugin')
module.exports={
    entry:{
        index:'./src/index.js'
    },
    output:{
        path:path.resolve(__dirname,'dist'),//必须使用该方法生成绝对路径
        filename:'[name].js' //[name]变量来源于entry中的键名
    },
    resolve:{
        extensions:['.js','.css','.json','.scss'] //导入这些文件时可 省略后缀
    },
    devServer:{},
    plugins:[
        new HtmlWebpackPlugin({
            title:'首页',
            filename:'index.html',
            template:'./index.html' //允许自定义一些模板
        }),
        new ExtractTextPlugin('[name].css')
    ],
    module:{
        rules:[
            {
                test:/\.css$/,
                use: ExtractTextPlugin.extract({
                    fallback: "style-loader",
                    use: "css-loader"
                })
            },
            {
                test:/\.scss$/,
                use: ExtractTextPlugin.extract({
                    fallback: "style-loader",
                    use: ['css-loader','sass-loader']
                })
            },
            {
                test:/\.(png|jpe?g|gif|svg)$/,
                loader:'url-loader',
                options:{
                    limit:10000 
                }
            },
            {
                test:/\.js$/,
                loader:'babel-loader',
                exclude:path.resolve(__dirname,'node_modules') //不进行解析的目录
            }
        ]
    }
}

在package.json中的scripts增加启动脚本

"dev":"webpack-dev-server --open",
"build":"webpack",

运行、打包

//运行开发环境
npm run dev

//打包编译
npm run build