Webpack：使用 WebpackDevServer 提升开发效率

用--watch监听打包文件

package.json

用WebpackDevServer自动监听自动刷新

配置webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');

module.exports = {
    mode: 'development',
    devtool: 'cheap-module-eval-source-map',
    devServer: {
        contentBase: './dist'
        //服务器启动在那一个文件夹下
    },
    entry: {
        main: './src/index.js'
    },
    module: { 
        rules: [{
            test: /\.(jpg|png|gif)$/,
            use: {
                loader: 'url-loader',
                options: { 
                    name: '[name]_[hash].[ext]',
                    outputPath: 'images/',
                    limit: 2048
                }
            }
        }, {
            test: /\.(eot|ttf|svg|woff|woff2)$/,
            use: {
                loader: 'file-loader'
            }
        }, {
            test: /\.scss$/,
            use: [
                'style-loader', 
                {
                    loader: 'css-loader',
                    options: {
                        importLoaders: 2,
                    }
                },
                'sass-loader',
                'postcss-loader'
            ]
        }]
    },
    output: { 
        path: path.resolve(__dirname, 'dist'),
        filename: '[name].js',
    },
    plugins: [new HtmlWebpackPlugin({
        template: 'src/index.html'
        //设置src目录下的index.html文件为模版
    }), new CleanWebpackPlugin()]
}

设置package.json，映射命令

运行  npm run start  启动

devServer的一些配置选项

webpack.config.js

const path = require('path');
const HtmlWebpackPlugin = require('html-webpack-plugin');
const CleanWebpackPlugin = require('clean-webpack-plugin');

module.exports = {
    mode: 'development',
    devtool: 'cheap-module-eval-source-map',
    devServer: {
        contentBase: './dist',
        //服务器启动在那一个文件夹下
        open: true,
        //devserver启动时,自动打开浏览器
        port: 8080
        //默认端口号
    },
    entry: {
        main: './src/index.js'
    },
    module: { 
        rules: [{
            test: /\.(jpg|png|gif)$/,
            use: {
                loader: 'url-loader',
                options: { 
                    name: '[name]_[hash].[ext]',
                    outputPath: 'images/',
                    limit: 2048
                }
            }
        }, {
            test: /\.(eot|ttf|svg|woff|woff2)$/,
            use: {
                loader: 'file-loader'
            }
        }, {
            test: /\.scss$/,
            use: [
                'style-loader', 
                {
                    loader: 'css-loader',
                    options: {
                        importLoaders: 2,
                    }
                },
                'sass-loader',
                'postcss-loader'
            ]
        }]
    },
    output: { 
        path: path.resolve(__dirname, 'dist'),
        filename: '[name].js',
    },
    plugins: [new HtmlWebpackPlugin({
        template: 'src/index.html'
        //设置src目录下的index.html文件为模版
    }), new CleanWebpackPlugin()]
}