Андрей Елпаев

var pool  = mysql.createPool({
  host     : 'example.org',
  user     : 'bob',
  password : 'secret'
});

pool.getConnection(function(err, connection) {
   connection.query( 'SELECT something FROM sometable', function(err, rows) {
        connection.release(); 
});

io.on('connection', function (socket) {
  console.log(socket.handshake.address);
});

io.on('connection', function (socket) {
   var id = socket.id;
   console.log(socket.manager.handshaken[id].address);
});

$('a').on("click", function(){
     alert('Работает'); 
});