第一个web服务器

 1 var http = require("http");  //加载http模块
 2 function process_request(req,res) {   //定义一个function   req=request  res=response
 3     var body = "Thanks for calling!\n";   
 4     var content_length = body.length;   //length 属性可返回字符串中的字符数目。
 5     res.writeHead(200,{               //write HTTP header
 6         ‘Content-Length‘: content_length,   
 7         ‘Content-Type‘ : ‘text/plain‘
 8     });
 9     res.end(body);
10 }
11 
12 var s = http.createServer(process_request);  
13 s.listen(8080);

 1 const http = require(‘http‘);
 2 
 3 const hostname = ‘127.0.0.1‘;
 4 const port = 3000;
 5 
 6 const server = http.createServer((req, res) => {
 7   res.statusCode = 200;
 8   res.setHeader(‘Content-Type‘, ‘text/plain‘);
 9   res.end(‘Hello World\n‘);
10 });
11 
12 server.listen(port, hostname, () => {
13   console.log(`Server running at http://${hostname}:${port}/`);
14 });