1-13 express listens to get and post requests & processes requests

express monitor GET request

// Import express
const express = require('express')
// establish web The server 
const app = express()

// Listen to the client GET and POST request 
//app.get Monitor client get request 
app.get('/user',(req,res)=>{
    // call express.send Method to the client corresponding object 
    res.send({name:'wang',gender:' male '})

})
//app.post Monitor client get request 
app.post('/user',(req,res)=>{
    // call express.send Method to the client corresponding object 
    res.send(' The request is successful ')

})


// start-up web The server 
app.listen(80,()=>{
    console.log('sever')
})

obtain URL Query parameters carried in

app.get('/',(req,res)=>{
    // adopt req.query You can get the data sent by the client , Query parameters 
    // Be careful , By default req.query Is an empty object 
    console.log(req.query)
    res.send(req.query)
})

obtain URL Dynamic parameters in

adopt req.params object . Access to URL in , adopt ： Matching dynamic parameters

app.get('/user/:id',(req,res)=>{
    //：id It's a dynamic parameter 
    //params The default is an empty object 
    // In it is stored through ： Dynamically matched parameter values 
   let params = req.params
    res.send(params)
})