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 webpack同之前的gulp相比,gulp属于非模块化打包工具,webpack属于模块化打包工具,两者的优劣这里不做过多分析(可自行百度)。

目的:是为了分享一下使用过程中,用到的插件、loader、遇到的各种问题以及解决办法,最后会附上最终代码。

在这个项目中,用 webpack打包css、scss、js、图片文件、jquery、第三方插件、字体图标,编译es6、压缩html、压缩js、压缩css ,基本涵盖了常用的东西。

代码结构如下

下面单独说几个难点

1、打包多页面,使用到的插件是html-wepack-plugin html-loader ,也就是你有多少个页面,就有多少个入口,也就写多少个模版文件。当然,页面过多时,可以考虑遍历处理。

//引入路径插件
const path = require('path');
//引入导出html插件
const HtmlWebpackPlugin = require('html-webpack-plugin');

const config = {
  //入口
  entry:{
  home:'./pages/lawSearchHomepage.js',
  list:'./pages/lawSearchList.js'
  },
  //出口
  output:{
  filename: '[name].bundle.js',
  path: path.resolve(__dirname,'build')    
  },
//插件
  plugins: [
    //html单独导出插件——首页
    new HtmlWebpackPlugin({
      filename:'lawSearchHomepage.html',//输出后的文件名称
      template:'./pages/lawSearchHomepage.html',//模版页面路径
      favicon:'./pages/images/favicon.ico',//页签图标
      chunks:['home'],//需要引入的js文件名称
      inject: true,
      hash:true,//哈希值
      minify: {//压缩
        removeComments: true,
        collapseWhitespace: true
      }
    }),
    //html单独导出插件——列表页
    new HtmlWebpackPlugin({
      filename:'lawSearchList.html',
      template:'./pages/lawSearchList.html',
      favicon:'./pages/images/favicon.ico',
      chunks:['list'],
      inject: true,
      hash:true,
      minify: {
        removeComments: true,
        collapseWhitespace: true
      }
    })
 ] 
}
module.exports = config;

2、单独打包css,使用到的插件extract-text-webpack-plugin ,loader有style-loader、css-loader、sass-loader、node-sass,因为每个页面要引入相对应的css文件,所以,在js入口文件里通过require('./lawSearchHomepage.scss')引如对应的scss文件,打包后css文件会单独打包,并通过link的形式引入html

//引入导出css插件
const ExtractTextPlugin = require('extract-text-webpack-plugin');

//loader
{//CSS
  test:/\.css/,
  use:ExtractTextPlugin.extract({
    use:['css-loader']
  })
},
{//Sass
   test:/\.scss/,
   use:ExtractTextPlugin.extract({
    fallback:"style-loader",
    use:['css-loader','sass-loader']
   },)
}
//plugins
//将css单独打包插件
new ExtractTextPlugin({
   filename:"[name].css",//制定编译后的文件名称
   allChunks:true,//把分割的块分别打包
}),

3、处理es6,安装babel、babel-loader@7(因为下面压缩js,其他版本报错)、babel-core、babel-preset-es2015(也是为了解决压缩js报错)

//loader
{//ES6
   test:/\.js$/,
   loader:'babel-loader',
   // exclude:__dirname+'node_modules',//不对这个进行babel转换,这里边已经打包好,这样能减少打包时间
   // include:__dirname+'src'这里的src是你要编译的js文件的目录,
   exclude:path.resolve(__dirname,'node_modules'),
   include:path.resolve(__dirname,'pages'),
   query:{//若在package.json中定义了这个presets,则这边可以删掉
     presets:['es2015']
   }
},

4、处理jquery,安装expose-loader

第一种方法可以通过在js里require('expose-loader?$!jquery');引入jquery

第二种通过loader

//loader
{//Jquery
   test: require.resolve('jquery'),
   use: [{
     loader: 'expose-loader',
     options: 'jQuery'
   },{
     loader: 'expose-loader',
     options: '$'
   }]
},

5、压缩css,使用插件optimize-css-assets-webpack-plugin,安装cssnano

//引入压缩css的插件
const optimizeCss = require('optimize-css-assets-webpack-plugin');
//引入cssnano插件
const cssnano = require('cssnano');

//plugins
plugins:[
  new optimizeCss({
     assetNameRegExp: /\.style\.css$/g,
     cssProcessor: cssnano,
     cssProcessorOptions: { discardComments: { removeAll: 
       true } },
     canPrint: true
  }),    
],
//压缩优化css,不写这个css还是没压缩,不知道为啥
optimization: {
    // minimize: true,
  minimizer: [new optimizeCss({})]
},

6、压缩js,一般的情况下,js默认就是压缩状态,但是在压缩完css后,js就不是压缩的了,所以还是处理一下,编译更快

用的插件uglifyjs-webpack-plugin

//引入js压缩插件
const uglifyjs = require('uglifyjs-webpack-plugin');

//plugins
new uglifyJs()

我的package.json中安装的插件

"devDependencies": {
  "babel": "^6.23.0",
  "babel-core": "^6.26.3",
  "babel-loader": "^7.1.5",
  "babel-preset-es2015": "^6.24.1",
  "clean-webpack-plugin": "^0.1.19",
  "css-loader": "^1.0.0",
  "cssnano": "^4.1.7",
  "expose-loader": "^0.7.5",
  "extract-text-webpack-plugin": "^4.0.0-beta.0",
  "file-loader": "^2.0.0",
  "font-awesome-webpack": "^0.0.5-beta.2",
  "html-loader": "^0.5.5",
  "html-webpack-plugin": "^3.2.0",
  "jquery": "^3.3.1",
  "node-sass": "^4.9.4",
  "optimize-css-assets-webpack-plugin": "^5.0.1",
  "postcss-loader": "^3.0.0",
  "sass-loader": "^7.1.0",
  "style-loader": "^0.23.1",
  "typeahead.js": "^0.11.1",
  "uglifyjs-webpack-plugin": "^2.0.1",
  "url-loader": "^1.1.2",
  "webpack": "^4.23.1",
  "webpack-cli": "^3.1.2",
  "webpack-dev-server": "^3.1.10"
 }

webpack.config.js里的代码(完整版)

//引入路径插件
const path = require('path');
//引入导出html插件
const HtmlWebpackPlugin = require('html-webpack-plugin');
//引入清除插件
const CleanWebpackPlugin = require('clean-webpack-plugin');
//引入导出css插件
const ExtractTextPlugin = require('extract-text-webpack-plugin');
//引入webpack
const webpack = require('webpack');
//引入压缩css的插件
const optimizeCss = require('optimize-css-assets-webpack-plugin');
//引入cssnano插件
const cssnano = require('cssnano');
//引入js压缩插件
const uglifyjs = require('uglifyjs-webpack-plugin');

//webpack配置内容
const config = {
  //入口
  entry:{
    home:'./pages/lawSearchHomepage.js',
    list:'./pages/lawSearchList.js'
  },
  //便于调试
  devtool:'inline-source-map',
  //服务
  devServer:{
    contentBase:'./build/lawSearchHomepage.html'
  },
  //loader模块
  module:{
    rules: [
      {//ES6
      test:/\.js$/,
      loader:'babel-loader',
      // exclude:__dirname+'node_modules',//不对这个进行babel转换,这里边已经打包好,这样能减少打包时间
      // include:__dirname+'src'这里的src是你要编译的js文件的目录,
      exclude:path.resolve(__dirname,'node_modules'),
      include:path.resolve(__dirname,'pages'),
      query:{//若在package.json中定义了这个presets,则这边可以删掉
        presets:['es2015']
      }
     },
     {//Jquery
      test: require.resolve('jquery'),
      use: [{
       loader: 'expose-loader',
       options: 'jQuery'
      },{
       loader: 'expose-loader',
       options: '$'
      }]
     },
     {//CSS
       test:/\.css/,
       use:ExtractTextPlugin.extract({
         use:['css-loader']
       })
     },
     {//Sass
       test:/\.scss/,
       use:ExtractTextPlugin.extract({
         fallback:"style-loader",
         use:['css-loader','sass-loader']
       },)
     },
     {//处理模块html
      test: /\.html$/,
      use: 'html-loader'
     },
     {//图片
      test: /\.(jpg|png|gif)$/,
      use: {
        loader: 'file-loader',
        options: {
          outputPath: 'images'
        }
      }
     },
     //字体图标
      {
      test: /\.(eot|svg|ttf|woff|woff2)\w*/,
      loader: 'file-loader'
     }
    ]
  },
  //插件
  plugins: [
    //清空build文件下的多余文件
    new CleanWebpackPlugin(['build']),
    //将css单独打包插件
    new ExtractTextPlugin({
     filename:"[name].css",//制定编译后的文件名称
     allChunks:true,//把分割的块分别打包
    }),
    //html单独导出插件——首页
    new HtmlWebpackPlugin({
      filename:'lawSearchHomepage.html',//输出后的文件名称
      template:'./pages/lawSearchHomepage.html',//模版页面路径
      favicon:'./pages/images/favicon.ico',//页签图标
      chunks:['home'],//需要引入的js文件名称
      inject: true,
      hash:true,//哈希值
      minify: {//压缩
        removeComments: true,
        collapseWhitespace: true
      }
    }),
    //html单独导出插件——列表页
    new HtmlWebpackPlugin({
      filename:'lawSearchList.html',
      template:'./pages/lawSearchList.html',
      favicon:'./pages/images/favicon.ico',
      chunks:['list'],
      inject: true,
      hash:true,
      minify: {
        removeComments: true,
        collapseWhitespace: true
      }
    }),
    //压缩css
    new optimizeCss({
     assetNameRegExp: /\.style\.css$/g,
     cssProcessor: cssnano,
     cssProcessorOptions: { discardComments: { removeAll: true } },
     canPrint: true
    }),
    //压缩js
    new uglifyjs()
  ],
  //压缩优化css
  optimization: {
    // minimize: true,
    minimizer: [new optimizeCss({})]
  },
  //出口
  output:{
    filename: '[name].bundle.js',
    path: path.resolve(__dirname,'build')    
  }
}

module.exports = config;

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