webpack4 单入口文件配置 多入口文件配置 以及常用的配置

单入口文件配置

webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');//自动生成html模板，以便在多个入口文件时，不用手动修改引入的js

module.exports = {
    entry: './src/index.js',
    plugins: [//配置html-webpack-plugin
        new HtmlWebpackPlugin({
            title: 'Output Management'
        })
    ],
    output: {
        filename: 'bundle.js',//打包后文件的名字
        path: path.resolve(__dirname, 'dist'),//打包后文件的输出目录
    },
    module: {
        rules: [
            {//打包css文件(可以用import在js中引入css文件)
                test: /.css$/,
                use: [
                    'style-loader',
                    'css-loader'
               ]
            },
            {//加载图片(js或css中引入图片时)
                test: /.(png|svg|jpg|gif)$/,
                use: [
                    {
                        loader: 'file-loader',
                        options:{
                            name: '[path][name].[ext]',//配置自定义文件模板
                            outputPath: '.',//配置打包后的输出目录(.代表在dist目录中生成)
                        }
                    }
                ]
            },
            {//加载字体
                test: /.(woff|woff2|eot|ttf|otf)$/,
                use: [
                    // 'file-loader'
                    {
                        loader:'file-loader',
                        options:{
                            name: '[path][name].[ext]',//配置自定义文件模板
                            outputPath: '.',//配置打包后的输出目录(.代表在dist目录中生成)
                        }
                    }
                ]
            },
            {//加载数据之csv与tsv
                test: /.(csv|tsv)$/,
                use: [
                    'csv-loader'
                ]
            },
            {//加载数据之xml   json不用配置就可以直接加载
                test: /.xml$/,
                use: [
                    'xml-loader'
                ]
            }
        ]
    }
};

package.json

{
  "name": "vueOrigin",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo "Error: no test specified" && exit 1",
    "build": "webpack",
    "dev": "webpack"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "css-loader": "^2.1.1",
    "csv-loader": "^3.0.2",
    "file-loader": "^3.0.1",
    "html-webpack-plugin": "^3.2.0",
    "style-loader": "^0.23.1",
    "webpack": "^4.30.0",
    "webpack-cli": "^3.3.1",
    "xml-loader": "^1.2.1"
  }
}

多入口文件 配置

webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');//自动生成html模板，以便在多个入口文件时，不用手动修改引入的js
const webpack = require('webpack');

module.exports = {
    entry: {
        app: './src/app.js',
        index: './src/index.js',
    },
    devServer: {//使用观察者模式(启动一个服务器，当文件有变动时，页面立即改变)
        contentBase:  path.join(__dirname, "dist"),//将dist目录设置为可访问文件
        compress: true,//一切服务都启用gzip 压缩
        port: 9000,//指定服务器监听的端口 8080：为默认端口
        hot: true,//告诉服务器，正在使用模块热替换
    },
    devtool: 'inline-source-map',//若有报错，报错信息会具体到某一个js文件的某一行
    plugins: [//配置html-webpack-plugin
        new HtmlWebpackPlugin({
            title: '这个是html模板',
            template: 'index.html',//配置html模板
            inject:true, //是否自动在模板文件添加 自动生成的js文件链接
            minify:{
                removeComments:true //是否压缩时 去除注释
            }
        }),
        new webpack.NamedModulesPlugin(),//模块热替换相关
        new webpack.HotModuleReplacementPlugin(),//模块热替换相关
    ],
    output: {
        filename: '[name].bundle.js',//打包后文件的名字
        path: path.resolve(__dirname, 'dist'),//打包后文件的输出目录
    },
    module: {
        rules: [
            {//打包css文件(可以用import在js中引入css文件)
                test: /.css$/,
                use: [
                    'style-loader',
                    'css-loader'
               ]
            },
            {//加载图片(js或css中引入图片时)
                test: /.(png|svg|jpg|gif)$/,
                use: [
                    {
                        loader: 'file-loader',
                        options:{
                            name: '[path][name].[ext]',//配置自定义文件模板
                            outputPath: '.',//配置打包后的输出目录(.代表在dist目录中生成)
                        }
                    }
                ]
            },
            {//加载字体
                test: /.(woff|woff2|eot|ttf|otf)$/,
                use: [
                    {
                        loader:'file-loader',
                        options:{
                            name: '[path][name].[ext]',//配置自定义文件模板
                            outputPath: '.',//配置打包后的输出目录(.代表在dist目录中生成)
                        }
                    }
                ]
            },
            {//加载数据之csv与tsv
                test: /.(csv|tsv)$/,
                use: [
                    'csv-loader'
                ]
            },
            {//加载数据之xml   json不用配置就可以直接加载
                test: /.xml$/,
                use: [
                    'xml-loader'
                ]
            }
        ]
    }
};

package.json

{
  "name": "vueOrigin",
  "version": "1.0.0",
  "description": "",
  "main": "index.js",
  "scripts": {
    "test": "echo "Error: no test specified" && exit 1",
    "start": "webpack-dev-server --open",
    "build": "webpack",
    "dev": "webpack"
  },
  "keywords": [],
  "author": "",
  "license": "ISC",
  "devDependencies": {
    "css-loader": "^2.1.1",
    "csv-loader": "^3.0.2",
    "file-loader": "^3.0.1",
    "html-webpack-plugin": "^3.2.0",
    "style-loader": "^0.23.1",
    "webpack": "^4.30.0",
    "webpack-cli": "^3.3.1",
    "webpack-dev-server": "^3.3.1",
    "xml-loader": "^1.2.1"
  }
}

 注意，使用webpack-dev-server时，将不会在本地生成dist静态文件，生成的打包后的文件将会存在内存中，不要大惊小怪，若想看到本地dist文件，不要开启webpack-dev-server服务器