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在我们开发的过程中，我们会使用webpack-dev-server实现自动刷新，webpack-dev-server会把编译后的文件全部保存在内存里，而不会写入到文件目录内。但当我们的开发是前端和后端在一个项目里的时候就不行了。我们可以使用webpack结合express实现自动编译刷新

• 配置webpack

首先就是配置webpack的配置。新建一个webpack.config.js文件

const path = require('path')
const webpack = require('webpack')
var hotMiddlewareScript = 'webpack-hot-middleware/client'module.exports = {entry: {main: ['./src/main.js', hotMiddlewareScript]},mode: 'development',output: {path: path.resolve(__dirname, 'public'),filename: 'js/[name].js',publicPath: '/'},resolve: {extensions: ['.js']},plugins: [new webpack.optimize.OccurrenceOrderPlugin(),new webpack.HotModuleReplacementPlugin(),new webpack.NoEmitOnErrorsPlugin()]
}
复制代码

我们这里需要关注的是，每个entry后都要增加一个hotMiddlewareScript，还有就是增加3个插件

首先新建一个webpack.middleware文件，这里我们需要用到webpack-dev-middleware和 webpack-hot-middleware两个中间件。

const webpack = require('webpack')
const webpackDevMiddleware = require('webpack-dev-middleware')
const webpackHotMiddleware = require('webpack-hot-middleware')
const webpackConfig = require('./webpack.config')module.exports = app => {let compiler = webpack(webpackConfig)app.use(webpackDevMiddleware(compiler, {publicPath: '/',stats: {colors: true,chunks: false}}))app.use(webpackHotMiddleware(compiler))  
}复制代码

注意：webpack-dev-middleware和webpack-hot-middleware的静态资源服务仅仅用于开发环境。到了生产环境，应该使用express.static()。

• 下面编写express代码

const express = require('express')
const bodyParser = require('body-parser')
const {resolve} = require('path')
const webpackMiddleware=require('./webpack.middleware')const router = express.Router()
const app=express()
const port = process.env.PORT || 3000webpackMiddleware(app)app.use(express.static(resolve(__dirname,'./public')))
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({ extended: true }))// ...代码app.use(router)app.listen(port, () => {console.log(`Server listening on http://localhost:${port}, Ctrl+C to stop`)
})复制代码

这样，我们在开发的时候，前端和后端都在同一个服务里运行了