a tcp server base on nodejs

index.js

/**
 * a tcp server base on nodejs
 * come from <<nodejs: javascript everywhere>>
 *
 */
// "use strict";
var net = require('net'),
    count=0,
    users={};

let server=net.createServer(function (conn) {
    console.log('\033[90m   new connection! \033[39m' );
    let nickname;
    conn.write(
        '\n > Welcome to \033[92mnode-chat\033[39m!'+
        '\n > '+count+' other people are connected at this time.'+
        '\n > Please write your name and press enter :  '
    );
    count++;

    conn.on('data',function (data) {
        // console.log(data.toString().replace('\r\n',''));
        data=data.toString().replace('\r\n','');
        // the un-login user
        if (!nickname) {
            if (users[data]){
                conn.write('\033[93m> nickname already in use. try again:\033[39m   ');

            }
            else {
                nickname=data;
                users[nickname]=conn;
                //  announce someone joined to all
                // for (let i in users){
                //     users[i].write('\033[90m > '+nickname+' joined this room\033[39m\n');
                // }
                broadcast('\033[90m > '+nickname+' joined this room\033[39m\n');
            }
        }
        else {
            // take this as message
            // for (let i in users){
            //     if (i!==nickname){
            //         users[i].write('\033[96m > '+nickname+':\033[39m '+data+'\n');
            //     }
            // }
              broadcast('\033[96m > '+nickname+':\033[39m '+data+'\n',true);

        }
    });

    conn.on('close',function () {
        count--;
        delete users[nickname];
        broadcast('\033[90m > '+nickname+' left the room\033[39m\n');
    });

    function broadcast(msg,exceptMyself) {
        for (let i in users){
            if (!exceptMyself || i!==nickname){
                users[i].write(msg);
            }
        }
    }

});

server.listen(3000,function () {
    console.log('\033[96m   server listening on *:3000  \033[39m');

});

package.json

{
  "name": "TcpChat",
  "version": "0.0.1",
  "description": "A simple TCP-Chat server",
  "dependencies": {
    
  }
}