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现在我们每次更改src目录下文件的时候，都需要手动运行一下打包命令，这是非常不利于开发体验的，因此，我们需要改良一下，引入webpack-dev-server。

npm i webpack-dev-server -D

webpack.config.js的配置如下：（webpack5必须要配置target）

const { resolve } = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');//打包html
const miniCssExtractPlugin = require('mini-css-extract-plugin');//分离样式
const OptimizeCssAssetsWebpackPlugin = require('optimize-css-assets-webpack-plugin');//压缩css
module.exports = {
    entry: './src/main.js',
    output: {
        filename: 'bundle.js',
        path: resolve(__dirname, 'dist')
    },
    module: {
        rules: [
            {
                test: /\.css$/,
                use: [miniCssExtractPlugin.loader, 'css-loader', 'postcss-loader']
            },
            {
                test: /\.less$/,
                use: [miniCssExtractPlugin.loader, 'css-loader', 'postcss-loader', 'less-loader']
            },
            {
                test: /\.scss$/,
                use: [miniCssExtractPlugin.loader, 'css-loader', 'postcss-loader', 'sass-loader']
            },
            {
                test: /\.(jpg|jpeg|png|gif)$/,
                loader: "url-loader",
                options: {
                    limit: 1024 * 10,
                    outputPath: 'imgs',
                    publicPath: './imgs',
                    esModule: false
                }
            },
            {
                test: /\.(htm|html)$/,
                loader: 'html-loader',
                options: {
                    esModule: false
                }
            },
            {
                test: /\.(eot|woff|ttf|svg)$/,
                loader: 'file-loader',
                options: {
                    outputPath: 'fonts',
                    publicPath: './fonts'
                }
            }
        ]
    },
    plugins: [
        new HtmlWebpackPlugin({
            template: './src/assets/index.html',
            hash: true,
            filename: 'index.html',
            favicon: './src/assets/favicon.ico'
        }),
        new miniCssExtractPlugin({
            filename: 'index.css'
        }),
        new OptimizeCssAssetsWebpackPlugin()
    ],
    mode: 'development',
    devServer: {
        contentBase: resolve(__dirname, 'dist'),//打包后的文件路径
        open: true,//自动打开浏览器
        compress: true,//启动gzip压缩
        port: 3000,//端口号
    },
    target: 'web',
}

package.json的配置如下：（运行一下npm run serve就OK啦）

{
  "name": "wpk5-demo",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "serve": "npx webpack serve",
    "build": "npx webpack"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "css-loader": "^5.2.0",
    "file-loader": "^6.2.0",
    "html-loader": "^2.1.2",
    "html-webpack-plugin": "^5.3.1",
    "less": "^4.1.1",
    "less-loader": "^8.0.0",
    "mini-css-extract-plugin": "^1.4.0",
    "node-sass": "^5.0.0",
    "optimize-css-assets-webpack-plugin": "^5.0.4",
    "postcss-loader": "^5.2.0",
    "postcss-preset-env": "^6.7.0",
    "sass-loader": "^11.0.1",
    "style-loader": "^2.0.0",
    "url-loader": "^4.1.1",
    "webpack": "^5.28.0",
    "webpack-cli": "^4.5.0",
    "webpack-dev-server": "^3.11.2"
  },
  "browserslist": [
    "> 1%",
    "last 2 versions",
    "not ie <= 8"
  ]
}

git仓库地址：

https://gitee.com/seimin/xiaoming2qianduan-webpack5/tree/v5.8/