安装
npm install express -S
基本使用
const express = require('express')
const app = express()
app.listen(3000)
const mid1 = (req, res, next) => {
console.log(1)
res.write('a')
next()
res.end()
console.log(2)
}
const mid2 = (req, res, next) => {
console.log(3)
res.write('b')
next()
res.write('d')
console.log(4)
}
const mid3 = (req, res, next) => {
console.log(5)
next()
res.write('c')
console.log(6)
}
app.use(mid1)
app.use(mid2)
app.use(mid3)
