问如何在带有jQuery UI可排序的"sortover“事件中，在拖放元素下面获取元素的索引？

EN

var start_sort_index,
over_sort_index,
update_sort_index;

$('#sortable').sortable({
        containment: 'parent',
        cursor: 'move',
    start: function(event, ui) {
      var draggedItem = ui.item;
      $(window).mousemove(function(e){
        moved(e, draggedItem);
      });
    },
    stop: function(event, ui) {
      $(window).unbind("mousemove");
    },
});

//Code from http://stackoverflow.com/questions/3298712/jquery-ui-sortable-determine-which-element-is-beneath-the-element-being-dragge
function moved(e, draggedItem) {
  //Dragged item's position++
  var dpos = draggedItem.position();
  var d = {
    top: dpos.top,
    bottom:    dpos.top + draggedItem.height(),
    left: dpos.left,
    right: dpos.left + draggedItem.width()
  };

  //Find sortable elements (li's) covered by draggedItem
  var hoveredOver = $('.sortable').not(draggedItem).not($( ".ui-sortable-placeholder" )).filter(function() {
    var t = $(this);
    var pos = t.position();

    //This li's position++
    var p = {
      top: pos.top,
      bottom:    pos.top + t.height(),
      left: pos.left,
      right: pos.left + t.width()
    };

    //itc = intersect
    var itcTop         = p.top <= d.bottom;
    var itcBtm         = d.top <= p.bottom;
    var itcLeft     = p.left <= d.right;
    var itcRight     = d.left <= p.right;

    return itcTop && itcBtm && itcLeft && itcRight;
  });

  if(hoveredOver.length){
    $('.hovering-output').html(hoveredOver.html() + " is being hovered");
    console.log(hoveredOver);
  } else{
    $('.hovering-output').html("");
  }
};