I am using jquery sortable function for Li within a Ul tag, when i am dragging and dropping elements within ul, then i wanting that it can not be dragged left or right within ul. it should be dragged only up and down.I am using jquery sortable function for Li with
阅读背景：
Jquery可排序元素应仅向上或向下移动而不是向左或向右移动
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