用jQuery改变元素顺序的最优方法

Given the following:

鉴于以下内容：

<a id="moveElementUp">Move Up</a>
<a id="moveElementDown">Move Dowm</a>

<div id="elementHolder">
    <a id="element-1">1</a>
    <a id="element-2">2</a>
    <a id="element-3">3</a>
    <a id="element-4">4</a>
</div>

<script type="text/javascript">
    function reOrder (el){
        // Change IDs of Elements to be Sequential
    }
    $('#moveElementUp').click(function(e){
        // Move Clicked Element Up One Spot in List

        reOrder();
    });
    $('#moveElementDown').click(function(e){
        // Move Clicked Element Down One Spot in List

        reOrder();
    });
</script>
<a id="moveEle