Express.js路由

路由就是它的字面意思。它用于确定应用程序的具体行为。它规定了如何应用程序响应于客户端请求，以特定路线，URI或路径和特定的HTTP请求方法（GET，POST等）。它可以处理不同类型的HTTP请求。

让我们举个例子来看看基本的路由。

文件：routing_example.js

var express = require('express');
var app = express();
app.get('/'，function (req，res) {
   console.log("Got a GET request for the homepage");
   res.send('Welcome to srcmini!');
})
app.post('/'，function (req，res) {
   console.log("Got a POST request for the homepage");
   res.send('I am Impossible! ');
})
app.delete('/del_student'，function (req，res) {
   console.log("Got a DELETE request for /del_student");
   res.send('I am Deleted!');
})
app.get('/enrolled_student'，function (req，res) {
   console.log("Got a GET request for /enrolled_student");
   res.send('I am an enrolled student.');
})
// This responds a GET request for abcd，abxcd，ab123cd，and so on
app.get('/ab*cd'，function(req，res) {   
   console.log("Got a GET request for /ab*cd");
   res.send('Pattern Matched.');
})
var server = app.listen(8000，function () {
var host = server.address().address
  var port = server.address().port
console.log("Example app listening at http://%s:%s"，host，port)
})