code: function TouchList() {
          var touchList = [];
  
          touchList.item = function(index) {
              return this[index] || null;
          };
  
          // specified by Mozilla
          touchList.identifiedTouch = function(id) {
              return this[id + 1] || null;
          };
  
          return touchList;
      }
docs: create empty touchlist with the methods
  @constructor
  @returns touchList