webapp.js

var http = require('http'),
	fs = require('fs');
var count = 0;

http.createServer(function (req, res) {

	// 計數器加一
	count++;

	// 將計數器中的數字寫入"count.txt"
	fs.writeFile("count.txt",count, function(){}); 

	// 別管這行
	res.writeHead(200, {'Content-Type': 'text/plain'});

	// 印出目前人數
	res.end('Hello, you are the '+count+"st guest!");

}).listen(8080, '127.0.0.1');

console.log('Server running at http://127.0.0.1:8080/');