[Dilettante_Pro]

Или так

<input type="text" class="cart-add" data-id = "1" data-description = "description" data-photo = "photo" />
<script src='http://code.jquery.com/jquery-latest.js'></script>
<script type="text/javascript">
cart = new Object();
  var info = [];
$(document).ready(function() {
$('.cart-add').on('click', add);
function add() {
   var id = $(this).attr("data-id");
   var description = $(this).attr("data-description");
   var photo = $(this).attr("data-photo");

   if (cart[id]!=undefined) {
   info[0]++;
   }
   else { info[0]=1;}
   info[1] = description;
   info[2]= photo;
   cart[id] = info; 

  console.log(JSON.stringify(cart));
  }
});
 
</script>