document.documentElement.scrollTop总为0的问题

你获取的元素是<html>
scrollTop可能是多少????

解决方案 »

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以下是我测试的代码：
<HTML>
<HEAD>
<TITLE> New Document </TITLE>
</HEAD><BODY id="theBody">
<form action="#" method="post">
 
<input type="text" name="__SCROLLPOS" id="__SCROLLPOS" value="10" onclick="javascript:alert(this.scrollLeft);">
<input type="submit" value="submit">
</form>
 
<script language='javascript'>
function saveScrollPosition()
{
alert(document.getElementById("theBody").scrollTop);
if (document.documentElement) document.getElementById("__SCROLLPOS").value =document.documentElement.scrollTop;
else if (document.body) document.getElementById("__SCROLLPOS").value = document.body.scrollTop;
}

document.onscroll=saveScrollPosition();
</script><script language='javascript'>
function setScrollPosition()
{
document.documentElement.scrollTop = document.getElementById("__SCROLLPOS").value;
}

document.onload=setScrollPosition();
</script>
 
</BODY>
</HTML>
看看下面的代码<HEAD>
<TITLE> New Document </TITLE>
</HEAD><BODY id="theBody">
<form action="#" method="post">
 
<input type="text" name="__SCROLLPOS" id="__SCROLLPOS" value="10" onclick="javascript:alert(this.scrollLeft);">
<input type="submit" value="submit">
</form>
 
<script language='javascript'>
function saveScrollPosition()
{

 document.getElementById("__SCROLLPOS").value = document.body.scrollTop;
alert(document.getElementById("theBody").scrollTop);
}

document.body.onscroll=saveScrollPosition;
function setScrollPosition()
{
document.body.scrollTop = document.getElementById("__SCROLLPOS").value;
}

document.onload=setScrollPosition;
</script>
 
</BODY>
</HTML>
判断document.documentElement和document.body仿佛意义不大