迁移到 Express 4

概述

Express 4 是 Express 3 的重大变化。这意味着如果您在其依赖项中更新 Express 版本，现有的 Express 3 应用程序将无法运行。

本文涵盖：

• Express 4 的变化。

• 将 Express 3 应用程序迁移到 Express 4 的 一个例子。

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Express 4 的变化

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Express 核心和中间件系统的变化

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1. 安装模块：npm install --save <module-name>
2. 在您的应用程序中，需要模块：require('module-name')
3. 根据其文档使用模块：app.use( ... )

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app.use 接受参数

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app.use('/book/:id', (req, res, next) => {
  console.log('ID:', req.params.id)
  next()
})

路由系统

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app.route() 方法

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app.route('/book')
  .get((req, res) => {
    res.send('Get a random book')
  })
  .post((req, res) => {
    res.send('Add a book')
  })
  .put((req, res) => {
    res.send('Update the book')
  })

express.Router 类

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var express = require('express')
var router = express.Router()

// middleware specific to this router
router.use((req, res, next) => {
  console.log('Time: ', Date.now())
  next()
})
// define the home page route
router.get('/', (req, res) => {
  res.send('Birds home page')
})
// define the about route
router.get('/about', (req, res) => {
  res.send('About birds')
})

module.exports = router

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var birds = require('./birds')

// ...

app.use('/birds', birds)

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其他变化

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应用迁移示例

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版本 3 应用程序

app.js

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var express = require('express')
var routes = require('./routes')
var user = require('./routes/user')
var http = require('http')
var path = require('path')

var app = express()

// all environments
app.set('port', process.env.PORT || 3000)
app.set('views', path.join(__dirname, 'views'))
app.set('view engine', 'pug')
app.use(express.favicon())
app.use(express.logger('dev'))
app.use(express.methodOverride())
app.use(express.session({ secret: 'your secret here' }))
app.use(express.bodyParser())
app.use(app.router)
app.use(express.static(path.join(__dirname, 'public')))

// development only
if (app.get('env') === 'development') {
  app.use(express.errorHandler())
}

app.get('/', routes.index)
app.get('/users', user.list)

http.createServer(app).listen(app.get('port'), () => {
  console.log('Express server listening on port ' + app.get('port'))
})

package.json

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{
  "name": "application-name",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node app.js"
  },
  "dependencies": {
    "express": "3.12.0",
    "pug": "*"
  }
}

迁移过程

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$ npm install serve-favicon morgan method-override express-session body-parser multer errorhandler express@latest pug@latest --save

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版本 4 应用程序

package.json

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{
  "name": "application-name",
  "version": "0.0.1",
  "private": true,
  "scripts": {
    "start": "node app.js"
  },
  "dependencies": {
    "body-parser": "^1.5.2",
    "errorhandler": "^1.1.1",
    "express": "^4.8.0",
    "express-session": "^1.7.2",
    "pug": "^2.0.0",
    "method-override": "^2.1.2",
    "morgan": "^1.2.2",
    "multer": "^0.1.3",
    "serve-favicon": "^2.0.1"
  }
}

app.js

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var http = require('http')
var express = require('express')
var routes = require('./routes')
var user = require('./routes/user')
var path = require('path')

var favicon = require('serve-favicon')
var logger = require('morgan')
var methodOverride = require('method-override')
var session = require('express-session')
var bodyParser = require('body-parser')
var multer = require('multer')
var errorHandler = require('errorhandler')

var app = express()

// all environments
app.set('port', process.env.PORT || 3000)
app.set('views', path.join(__dirname, 'views'))
app.set('view engine', 'pug')
app.use(favicon(path.join(__dirname, '/public/favicon.ico')))
app.use(logger('dev'))
app.use(methodOverride())
app.use(session({
  resave: true,
  saveUninitialized: true,
  secret: 'uwotm8'
}))
app.use(bodyParser.json())
app.use(bodyParser.urlencoded({ extended: true }))
app.use(multer())
app.use(express.static(path.join(__dirname, 'public')))

app.get('/', routes.index)
app.get('/users', user.list)

// error handling middleware should be loaded after the loading the routes
if (app.get('env') === 'development') {
  app.use(errorHandler())
}

var server = http.createServer(app)
server.listen(app.get('port'), () => {
  console.log('Express server listening on port ' + app.get('port'))
})

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app.listen(app.get('port'), () => {
console.log('Express server listening on port ' + app.get('port'))
})

运行应用程序

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$ node .

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升级到 Express 4 应用程序生成器

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安装

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$ npm uninstall -g express

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$ npm install -g express-generator

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应用生成器的变化

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示例

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$ express app4

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$ npm start

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app.set('port', process.env.PORT || 3000)

var server = app.listen(app.get('port'), () => {
  debug('Express server listening on port ' + server.address().port)
})

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var debug = require('debug')('app4')

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