<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<script src="../ajax/jquery.js"></script>
</head>
<body>
<div id="butn">
<div>第一個</div>
<div>第二個</div>
<div>第三個</div>
<div>第四個</div>
<div>第五個</div>
<div>第六個</div>
<div>第七個</div>
<div id="first">第十個</div>
</div>
<script>
$(function(){
$("#first").prependTo($("#butn"));
})
</script>
</body>
</html>