node.js基础知识小结

const http = require('http');

const hostname = '127.0.0.1';
const port = 3000;

const server = http.createServer((req, res) => {
 res.statusCode = 200;
 res.setHeader('Content-Type', 'text/plain');
 res.end('Hello World\n');
});

server.listen(port, hostname, () => {
 console.log(`Server running at http://${hostname}:${port}/`);
});

var express = require('express');
var app = express();
 
app.get('/', function (req, res) {
  res.send('Hello World');
})
 
var server = app.listen(8081, function () {
 
 var host = server.address().address
 var port = server.address().port
 
 console.log("access url is http://%s:%s", host, port)
 
})