试试这个:

arr.sort(function(a, b){
  var titleA = a.title;
  var titleB = b.title;
  var arrA = titleA.split(' - ');
  var arrB = titleB.split(' - ');
  var keyA1 = parseInt(arrA[0]), keyA2 = parseInt(arrA[1]) 
      keyB1 = parseInt(arrB[0]), keyB2 = parseInt(arrB[1]);

  // Compare the 2 keys
  if (keyA1 < keyB1) return -1;
  if (keyA1 > keyB1) return 1;
  if (keyA2 < keyB2) return -1;
  if (keyA2 > keyB2) return 1;
  return 0;
});