js+css使DIV始终居于屏幕中间 左下 左上 右上 右下的代码集合，需要的朋友可以参考下。
复制代码 代码如下:
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " "> <html xmlns="
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" " ">
<html xmlns=" ">
<HEAD>
<TITLE>随滚动条移动的层 </TITLE>
<META HTTP-EQUIV="Content-Type" CONTENT="text/html" charset="gb2312">
</HEAD>
<style>
<!--
.div{
position: absolute;
border: 2px solid red;
background-color: #EFEFEF;
line-height:90px;
font-size:12px;
z-index:1000;
}
-->
</style>
<BODY>
<div>正中...</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>
<div>左上...</div>
<SCRIPT LANGUAGE="JavaScript">
function sc2(){
document.getElementById("Javascript.Div2").style.top=(document.documentElement.scrollTop)+"px";
document.getElementById("Javascript.Div2").style.left=(document.documentElement.scrollLeft)+"px";
}
</SCRIPT>
<div>左下...</div>
<SCRIPT LANGUAGE="JavaScript">
function sc3(){
document.getElementById("Javascript.Div3").style.top=(document.documentElement.scrollTop+document.documentElement.clientHeight-document.getElementById("Javascript.Div3").offsetHeight)+"px";
document.getElementById("Javascript.Div3").style.left=(document.documentElement.scrollLeft)+"px";
}
</SCRIPT>
<div>右上...</div>
<SCRIPT LANGUAGE="JavaScript">
function sc4(){
document.getElementById("Javascript.Div4").style.top=(document.documentElement.scrollTop)+"px";
document.getElementById("Javascript.Div4").style.left=(document.documentElement.scrollLeft+document.documentElement.clientWidth-document.getElementById("Javascript.Div4").offsetWidth)+"px";
}
</SCRIPT>
<div>右下...</div>
<SCRIPT LANGUAGE="JavaScript">
function sc5(){
document.getElementById("Javascript.Div5").style.top=(document.documentElement.scrollTop+document.documentElement.clientHeight-document.getElementById("Javascript.Div5").offsetHeight)+"px";
document.getElementById("Javascript.Div5").style.left=(document.documentElement.scrollLeft+document.documentElement.clientWidth-document.getElementById("Javascript.Div5").offsetWidth)+"px";
}
</SCRIPT>
<SCRIPT LANGUAGE="JavaScript">
<!--
function scall(){
sc1();sc2();sc3();sc4();sc5();
}
window.onscroll=scall;
window.onresize=scall;
window.onload=scall;
//-->
</SCRIPT>
<div></div>
</BODY>
</HTML>
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