`app.js`

考虑具有以下 app.js 文件的 Express v.3 应用程序：

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'))
})