原生：
1 const http=require('http'); 2 http.createServer((request,response)=>{ 3 response.writeHead(200,{"Content-Type": "text/plain"}); 4 response.write("Hello World"); 5 response.end(); 6 }).listen(8888)
1 const http=require('http'); 2 function onRequest(req,res){ 3 res.writeHead(200,{"Content-Type":"text/plain"}); 4 res.write('Hello World'); 5 res.end(); 6 } 7 http.createServer(onRequest).listen(8888);
koa:
1 const Koa=require('koa'); 2 const app=new Koa(); 3 app.listen(8888)
express
1 const express=require('express'); 2 const http=require('http'); 3 const app=express(); 4 const server=http.createServer(app); 5 server.listen(8081);
