本文实例讲述了JS实现固定在右下角可展开收缩DIV层的方法。分享给大家供大家参考。具体实现方法如下：
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JS实现固定在右下角可展开收缩的DIV层</title>
<style type="text/css">
<!--
*{margin:0;padding:0;}
body{text-align:center;}
#main{border:red 1px solid;width:1000px;height:1600px;margin:0 auto;}
#main #scroll{width:250px;height:150px;border:green 1px solid;text-align:left;position:absolute;visibility:hidden;}
#main #scroll #open{float:left;text-align:center;width:180px;}
#main #scroll #close{float:right;}
//-->
</style>
</head>
<body>
<div id="main">
仅实现核心部分，至于内容自己完善，或者继续美化一下，应该不错！
<div id="scroll"><div id="open" onmouseover="openbox()"><a href="/" onclick="openbox()">欢迎光临</a><div id="close" class="zzsky"><marquee align="left" onmouseover="stop()" onmouseout="start()">欢迎提出宝贵建议！</marquee></div></div>
<div id="close"><a href="#" onclick="closebox()">关闭</a>
<script type="text/javascript">
<!--
var scroll=document.getElementById("scroll")
var main=document.getElementById("main")
var open=document.getElementById("open")
var close=document.getElementById("close")
scroll.style.visibility="visible"
function runright()
{
/*这里-4主要是为了显示的比较好，因为我设置了边框*/
scroll.style.top=document.body.scrollTop+document.body.clientHeight-scroll.clientHeight-4+"px"
scroll.style.left=document.body.scrollLeft+document.body.clientWidth-scroll.clientWidth-4+"px"
/*隔一段时间执行这个函数*/
setTimeout("runright()",30)
}
/*关闭:设置高度一直减*/
function closebox()
{
scroll.style.height=scroll.offsetHeight-4+"px"
if (scroll.offsetHeight>20)
{
setTimeout("closebox()",5)
}
else
{
close.style.visibility="hidden"
}
}
function openbox()
{
if (scroll.offsetHeight<148)
{
close.style.visibility="visible"
scroll.style.height=scroll.offsetHeight+2+"px"
setTimeout("openbox()",5)
}
}
runright();
//-->
</script>
</div>
</div>
</div>
</body>
</html>
希望本文所述对大家的javascript程序设计有所帮助。