source/sortable-helper.js
function (event) {
          var obj = event;
          if (event.targetTouches !== undefined) {
            obj = event.targetTouches.item(0);
          } else if (event.originalEvent !== undefined && event.originalEvent.targetTouches !== undefined) {
            obj = event.originalEvent.targetTouches.item(0);
          }
          return obj;
        }
function (event) {
          var obj = event;
          if (event.targetTouches !== undefined) {
            obj = event.targetTouches.item(0);
          } else if (event.originalEvent !== undefined && event.originalEvent.targetTouches !== undefined) {
            obj = event.originalEvent.targetTouches.item(0);
          }
          return obj;
        }
function ( event ) { var obj = event ; if ( event . targetTouches !== undefined ) { obj = event . targetTouches . item ( 0 ) ; } else if ( event . originalEvent !== undefined && event . originalEvent . targetTouches !== undefined ) { obj = event . originalEvent . targetTouches . item ( 0 ) ; } return obj ; }
get the event object for touch.

@param  {Object} event the touch event
@return {Object} the touch event object.
get the event object for touch .