12-server.js

var net = require("net");

var server = net.createServer(function(connection) { 
	console.log('client connected');
	connection.on('end', function() {
		console.log('客户端关闭连接');
	});
	connection.write('Hello World!\r\n');
	connection.pipe(connection);
});

server.listen(8080, function() { 
	console.log('server is listening');
});