层随屏幕滚动，保持在屏幕的相对高度

来源：互联网发布：狗为什么抓老鼠知乎编辑：程序博客网时间：2024/05/29 04:55

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<HEAD>
<TITLE>code by：haiwa - 随滚动条移动的层 - 中国asp之家 - www.aspxhome.com</TITLE>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html" charset="gb2312">
</HEAD>
<style>

</style>
<BODY>
<div id="Javascript.Div1" class="div" style="width: 240px; height:90px" align="center">正中...
<div id="info"></div>
</div>
<SCRIPT LANGUAGE="JavaScript">
function sc1(){
document.getElementById("Javascript.Div1").style.top=(document.documentElement.scrollTop+(document.documentElement.clientHeight-document.getElementById("Javascript.Div1").offsetHeight)/2)+"px";
document.getElementById("Javascript.Div1").style.left=(document.documentElement.scrollLeft+(document.documentElement.clientWidth-document.getElementById("Javascript.Div1").offsetWidth)/2)+"px";
}
</SCRIPT>

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如果没有 <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
此例将达不到效果。