我根據(jù)官方文檔用 webpack-dev-middleware 配合 express啟動web服務器加載js文件404錯誤，用webpack-dev-server是可以的。webpack.config.js文件：const path = require('path');const HtmlWebpackPlugin = require('html-webpack-plugin');const CleanWebpackPlugin = require('clean-webpack-plugin');module.exports = {  entry: {    hello: './src/index.js'  },  devtool: 'inline-source-map', // 追蹤錯誤和警告  devServer: { // 一個簡單的服務器    contentBase: './dist' // 靜態(tài)文件路徑  },  plugins: [    new CleanWebpackPlugin(['dist']), // 構建前清理dist文件夾    new HtmlWebpackPlugin({ // 動態(tài)生成index.html插件      title: 'Ajax demo',      template: 'index.html', // 模板文件      inject: true // 模板注入    })  ],  output: {    filename: '[name].bundle.js',    path: path.resolve(__dirname, 'dist'),    publicPath: '/' // 服務器端路徑  }};server.js,就是官方文檔中的代碼:const express = require('express');const webpack = require('webpack');const webpackDevMiddleware = require('webpack-dev-middleware');const app = express();const config = require('./webpack.config.js');const compiler = webpack(config);// Tell express to use the webpack-dev-middleware and use the webpack.config.js// configuration file as a base.app.use(webpackDevMiddleware(compiler, {  publicPath: config.output.publicPath}));// Serve the files on port 3000.app.listen(3000, function () {  console.log('Example app listening on port 3000!\n');});