var str="1,2,1,2,31,2";var arr = str.split(",");for (var i = 0; i < arr.length; i++) { arr[i] = parseInt(arr[i])+1;}console.log(arr);
$.map( arr, function(n){ return n + 4;});
[2, 3, 2, 3, 32, 3][6, 7, 6, 7, 36, 7]