Using AddKeyListener To Bind Keys Javascript

I'm making a small game for a class and I am having trouble finding a way to bind keys to functions. One solution I found was using addEventListener, however I cannot find a way to

Solution 1:

var x = event.which || event.keyCode;  // Use either which or keyCode, depending on browser support

Solution 2:

Try to do it in jQuery way.

  jsfiddle.net/jpmvkqzh/

position.left of element keep increasing 5px when user pressing right arrow key and deceasing 5px when user pressing left arrow key.

.stop() is to stop the currently-running animation on the matched elements.