Based on the Prudential Center FAQ page, it appears computers and smaller bags are permitted; they are not listed as prohibited items:
Having said the above, I could swear when I checked this last season laptops were prohibited. (I could also be thinking of the Devils game I attended at Nassau Coliseum last season.)
I would contact Guest Services at the Prudential Center for more information. There is a phone number in the FAQ section as well as a Guest Services tab in the link above.