nodejs学习：net模块

官方API文档地址：https://nodejs.org/api/net.html

1. 创建一个server.js

    var net = require('net');
    var PORT  = 8099;
    var HOST = '127.0.0.1'
   
    var server = net.createServer();
    server.on('connection', function(client) {
        client.name = client.remoteAddress + ':' + client.remotePort
        client.write('Hi ' + client.name + '!\n');
   
        client.on('data', function(data) {
            client.write(data);
        })
        client.on('end', function() {
            client.write('Bye ' + client.name + '!\n');
        })
   
        client.on('error', function(e) {
            console.log('error:'+ e.message);
        })
    });
   
    server.on('listening', function() {
        console.log('Server is listening on port', PORT);
    });
    server.listen(PORT,HOST);

2. 连接