i want to create a simple event handler for a game, here's my code

```
     $(document).keydown(function(e){
      switch(e.keyCode){
        case 65: //left (a)

          console.log('left');
          break;

        case 68: //right (d)

          console.log('right');
          break;

      }
    });

```

the problem is that if i press and hold a key, after a little it triggers multiple times.
how can i prevent this behaviour? i'm running my code on google chrome