javascript实现防MSN、QQ的消息提示样式,代码如下：
<style>
body{overflow:hidden;margin:0px}
div{position:absolute}
</style>
<div style="background-color:#3399CC;z-index:100">请问如何使层始终居于顶部</div>
<div style="100%;height:100%;overflow:auto"><script>document.write(new Array(100).join('a<br>'))</script>
</div>
<script language="JavaScript">
window.onload = getMsg;
window.onresize = resizeDiv;
window.onerror = function(){}
//短信提示使用(asilas添加)
var divTop,divLeft,divWidth,divHeight,docHeight,docWidth,objTimer,i = 0;
function getMsg()
{
try{
divTop = parseInt(document.getElementById("eMeng").style.top,10)
divLeft = parseInt(document.getElementById("eMeng").style.left,10)
divHeight = parseInt(document.getElementById("eMeng").offsetHeight,10)
divWidth = parseInt(document.getElementById("eMeng").offsetWidth,10)
docWidth = document.body.clientWidth;
docHeight = document.body.clientHeight;
document.getElementById("eMeng").style.top = parseInt(document.body.scrollTop,10) +
docHeight + 10;// divHeight
document.getElementById("eMeng").style.left = parseInt(document.body.scrollLeft,10) +
docWidth - divWidth
document.getElementById("eMeng").style.visibility="visible"
objTimer = window.setInterval("moveDiv()",10)
}
catch(e){}
}
function resizeDiv()
{
i+=1
if(i>500) closeDiv()
try{
divHeight = parseInt(document.getElementById("eMeng").offsetHeight,10)
divWidth = parseInt(document.getElementById("eMeng").offsetWidth,10)
docWidth = document.body.clientWidth;
docHeight = document.body.clientHeight;
document.getElementById("eMeng").style.top = docHeight - divHeight + parseInt
(document.body.scrollTop,10)
document.getElementById("eMeng").style.left = docWidth - divWidth + parseInt
(document.body.scrollLeft,10)
}
catch(e){}
}
function moveDiv()
{
try
{
if(parseInt(document.getElementById("eMeng").style.top,10) <= (docHeight - divHeight +
parseInt(document.body.scrollTop,10)))
{
window.clearInterval(objTimer)
objTimer = window.setInterval("resizeDiv()",1)
}
divTop = parseInt(document.getElementById("eMeng").style.top,10)
document.getElementById("eMeng").style.top = divTop - 1
}
catch(e){}
}
function closeDiv()
{
document.getElementById('eMeng').style.visibility='hidden';
if(objTimer) window.clearInterval(objTimer)
}
</script>
<DIV id=eMeng style="BORDER-RIGHT: #455690 1px solid; BORDER-TOP: #a6b4cf 1px solid; Z-
INDEX:99999; LEFT: 0px; VISIBILITY: hidden; BORDER-LEFT: #a6b4cf 1px solid; WIDTH: 180px;
BORDER-BOTTOM: #455690 1px solid; POSITION: absolute; TOP: 0px; HEIGHT: 116px; BACKGROUND-
COLOR: #c9d3f3">
<TABLE style="BORDER-TOP: #ffffff 1px solid; BORDER-LEFT: #ffffff 1px solid" cellSpacing=0
cellPadding=0 width="100%" bgColor=#cfdef4 border=0>
<TBODY>
<TR>
<TD style="FONT-SIZE: 12px; BACKGROUND-IMAGE: url(msgTopBg.gif); COLOR: #0f2c8c" width=30
height=24></TD>
<TD style="FONT-WEIGHT: normal; FONT-SIZE: 12px; BACKGROUND-IMAGE: url(msgTopBg.gif);
COLOR: #1f336b; PADDING-TOP: 4px;PADDING-left: 4px" valign=middle width="100%"> 短消息提示
：</TD>
<TD style="BACKGROUND-IMAGE: url(msgTopBg.gif); PADDING-TOP: 2px;PADDING-right:2px"
vAlign=center align=right width=19><span title=关闭 style="CURSOR: hand;color:red;font-
size:12px;font-weight:bold;margin-right:4px;" onclick=closeDiv() >×</span><!-- <IMG title=
关闭 style="CURSOR: hand" onclick=closeDiv() hspace=3 src="msgClose.jpg"> --></TD>
</TR>
<TR>
<TD style="PADDING-RIGHT: 1px; BACKGROUND-IMAGE: url(1msgBottomBg.jpg); PADDING-BOTTOM:
1px" colSpan=3 height=90>
<DIV style="BORDER-RIGHT: #b9c9ef 1px solid; PADDING-RIGHT: 13px; BORDER-TOP: #728eb8 1px
solid; PADDING-LEFT: 13px; FONT-SIZE: 12px; PADDING-BOTTOM: 13px; BORDER-LEFT: #728eb8 1px
solid; WIDTH: 100%; COLOR: #1f336b; PADDING-TOP: 18px; BORDER-BOTTOM: #b9c9ef 1px solid;
HEIGHT: 100%">您有<font color=#FF0000>1</font>封新短消息<BR><BR>
<DIV align=center style="word-break:break-all"><a
href="http://www.lsdns.com%22%3e%3cfont/ color=#FF0000>欢迎光临绿谷空间</font></a></DIV
>
</DIV>
</TD>
</TR>
</TBODY>
</TABLE>
</DIV>
</body>
</html>
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