經常會有傳回頂部、回到底部的需求，推薦一種比較簡單的寫法
JQ中有 scrollTop() 方法可以幫助我們快速實作該需求
示例：
<html>
<body >
<div class="div1" style="width:200px;height:200px;overflow:auto">This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text.This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text. This is some text.</div>
<button onclick="test()">測試傳回</butoon>
</body>
<script src="http://libs.baidu.com/jquery/1.9.0/jquery.js" type="text/javascript"></script>
<script type="text/javascript">
function test(){
$(".div1").scrollTop(0);//此為滾動條的位置--傳回頂部
$(".div1").scrollTop($(document).height());//此為滾動條的位置---傳回底部 直接取dom的高度
}
</script>
</html>
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