node study notes---express

Basic use

// 1. 引包
var express = require('express')
//获取服务器对象
var app = express()

//设置路由，访问127.0.0.1:3000
//显示   node express
app.get('/',function(req,res){
    
    
   res.send('node express');
})
//设置路由，访问127.0.0.1:3000/first
//显示  first
app.get('/first', function (req, res) {
    
    
  res.send('first')
})

//设置监听
app.listen(3000,function(){
    
    
    console.log('run server--------');
})

Interception processing must be written after the last route

app.use(function (req, res) {
    
    
}

Express cannot directly process post requests and requires third-party dependency support. Here, body-parser
npm install body-parser -S is recommended

express handles post requests

var express = require('express')
var bodyParser = require('body-parser')
//获取服务器对象
var app = express()

//配置bodyParser
app.use(bodyParser.urlencoded({
    
     extended: false }))
app.use(bodyParser.json())

app.get('/', function (req, res) {
    
    
  res.render('index.html');//首页返回index.html页面
})

//处理post请求，req.body为接受的数据
app.post('/post', function (req, res) {
    
    
     res.send(req.body);
})

//设置监听
app.listen(3000,function(){
    
    
    console.log('run server--------');
})