分享一款ajax弹出提示层特效，图层弹出过程带缓冲显示效果，可根据自己的需求来自定义图层大小。
<!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">
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<title>ajax实现弹出图层缓冲效果_武鸣人</title>
<style type="text/css">
#www_wuming_ren {position:absolute;z-index:10;left:10px;top:10px;border:1px #666666 solid;background:#eeeeee;width:10px;height:10px}
.LoadContent {width:100%;height:100%;overflow:auto}
</style>
<script LANGUAGE="JavaScript">
<!--
function $(){return document.getElementById?document.getElementById(arguments[0]):eval(arguments[0]);}
var OverH,OverW,ChangeDesc,ChangeH=50,ChangeW=50;
function OpenDiv(_Dw,_Dh,_Desc) {
$("www_wuming_ren").innerHTML="Loading...";
OverH=_Dh;OverW=_Dw;ChangeDesc=_Desc;
$("www_wuming_ren").style.display='';
if(_Dw>_Dh){ChangeH=Math.ceil((_Dh-10)/((_Dw-10)/50))}else if(_Dw<_Dh){ChangeW=Math.ceil((_Dw-10)/((_Dh-10)/50))}
$("www_wuming_ren").style.top=(document.documentElement.clientHeight-10)/2+"px";
$("www_wuming_ren").style.left=(document.documentElement.clientWidth-10)/2+"px";
OpenNow()
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
var Nw=10,Nh=10;
function OpenNow() {
if (Nw>OverW-ChangeW)ChangeW=2;
if (Nh>OverH-ChangeH)ChangeH=2;
Nw=Nw+ChangeW;Nh=Nh+ChangeH;
if(OverW>Nw||OverH>Nh) {
if(OverW>Nw) {
$("www_wuming_ren").style.width=Nw+"px";
$("www_wuming_ren").style.left=(document.documentElement.clientWidth-Nw)/2+"px";
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
if(OverH>Nh) {
$("www_wuming_ren").style.height=Nh+"px";
$("www_wuming_ren").style.top=(document.documentElement.clientHeight-Nh)/2+"px"
}
window.setTimeout("OpenNow()",10)
}else{
Nw=10;Nh=10;ChangeH=50;ChangeW=50;
AjaxGet(ChangeDesc)
}
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
//创建XML对象
function createXMLHttps(){
var ret = null;
try {ret = new ActiveXObject('Msxml2.XMLHTTP')}
catch (e) {
try {ret = new ActiveXObject('Microsoft.XMLHTTP')}
catch (ee) {ret = null}
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
if (!ret&&typeof XMLHttpRequest !='undefined') ret = new XMLHttpRequest();
return ret;
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
function AjaxGet(URL) {
var xmlhttp = createXMLHttps();
xmlhttp.open("Get",URL,true);
xmlhttp.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xmlhttp.onreadystatechange = function() {
if (xmlhttp.readyState == 4 && xmlhttp.status==404) {$("www_wuming_ren").innerHTML='读取页面失败，文件'+URL+'不存在！';return}
if (xmlhttp.readyState == 4 && xmlhttp.status == 200) {
$("www_wuming_ren").innerHTML="<div class='LoadContent'>"+xmlhttp.responseText+"</div>";
}
}
xmlhttp.send(null);
}//武鸣人网站https://www.wuming.ren 网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)
//-->
</script>
</head>
<body>
<a href="https://www.wuming.ren">武鸣人</a>，各种信息资源免费发布，分享励志语录经典短句，减肥健身常识，各种js特效代码。网站很好记住，wuming.ren(武鸣拼音.ren域名后缀)<hr>
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<script type="text/javascript" src="https://www.wuming.ren/ad/tc.js"></script>
<script type="text/javascript" src="https://www.wuming.ren/ad/a.js"></script>
<a href="#" onmouseover="OpenDiv(500,300,'https://www.wuming.ren/')">aa.htm(500*300)</a><br>
<a href="#" onmouseover="OpenDiv(500,200,'https://www.wuming.ren/')">b.htm(500*200)</a><br>
<a href="javascript:OpenDiv(200,500,'https://www.wuming.ren/')">c.htm(200*500)</a><br>
<a href="javascript:OpenDiv(500,500,'https://www.wuming.ren/')">d.htm(500*500)</a><br>
<div id="www_wuming_ren" style="display:none" onmouseout="this.style.display='none'"></div>
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