网页特效：模仿新浪邮箱的alert渐变的提示框-heycode-嘿！代码。a

<!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” xml:lang=”zh-CN” lang=”zh-CN”>
<head>
<meta name=”verify-v1″ content=”P4T6fFCiPVxqMWZ2eztyXVzMHlnwD0wLQOq6LBHN5Y8=” />
<title>设计家园 dwww.cn 提供最新最快的网页技术</title>
<meta http-equiv=”Content-Type” content=”text/html; charset=gb2312″ />
<meta http-equiv=”Content-Language” content=”gb2312″ />
<style type=”text/css”>
*{
margin:0;padding:0;
}
</style>
</head>
<body>

<div class=”cecmbody” id=”cecmpolicy”>
<div class=”leftClass”>

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<input type=”button” value=”点击这里” onclick=”sAlert(‘我是一个渐变的sAlert’,this);” />
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</div>
<div class=”rightClass”>
</div>
</div>
<script type=”text/javascript” language=”javascript”>

function sAlert(txt){
var eSrc=(document.all)?window.event.srcElement:arguments[1];
var shield = document.createElement(“DIV”);
shield.id = “shield”;
shield.style.position = “absolute”;
shield.style.left = “0px”;
shield.style.top = “0px”;
shield.style.width = “100%”;
shield.style.height = document.body.scrollHeight+”px”;
shield.style.background = “#333″;
shield.style.textAlign = “center”;
shield.style.zIndex = “10000″;
shield.style.filter = “alpha(opacity=0)”;
shield.style.opacity = 0;
var alertFram = document.createElement(“DIV”);
alertFram.id=”alertFram”;
alertFram.style.position = “absolute”;
alertFram.style.left = “50%”;
alertFram.style.top = “50%”;
alertFram.style.marginLeft = “-225px” ;
alertFram.style.marginTop = -75+document.documentElement.scrollTop+”px”;
alertFram.style.width = “450px”;
alertFram.style.height = “150px”;
alertFram.style.background = “#ccc”;
alertFram.style.textAlign = “center”;
alertFram.style.lineHeight = “150px”;
alertFram.style.zIndex = “10001″;

strHtml = “<ul style=\\”list-style:none;margin:0px;padding:0px;width:100%\\”>\\n”;
strHtml += ” <li style=\\”background:#DD828D;text-align:left;padding-left:20px;font-size:14px;font-weight:bold;height:25px;line-height:25px;border:1px solid #F9CADE;\\”>[系统提示]</li>\\n”;
strHtml += ” <li style=\\”background:#fff;text-align:center;font-size:12px;height:120px;line-height:120px;border-left:1px solid #F9CADE;border-right:1px solid #F9CADE;\\”>”+txt+”</li>\\n”;
strHtml += ” <li style=\\”background:#FDEEF4;text-align:center;font-weight:bold;height:25px;line-height:25px; border:1px solid #F9CADE;\\”><input type=\\”button\\” value=\\”确定\\” id=\\”do_OK\\” onclick=\\”doOk()\\” /></li>\\n”;
strHtml += “</ul>\\n”;
alertFram.innerHTML = strHtml;
document.body.appendChild(alertFram);
document.body.appendChild(shield);
this.setOpacity = function(obj,opacity){
if(opacity>=1)opacity=opacity/100;
try{ obj.style.opacity=opacity; }catch(e){}
try{
if(obj.filters.length>0&&obj.filters(“alpha”)){
obj.filters(“alpha”).opacity=opacity*100;
}else{
obj.style.filter=”alpha(opacity=\\”"+(opacity*100)+”\\”)”;
}
}catch(e){}
}
var c = 0;
this.doAlpha = function(){
if (++c > 20){clearInterval(ad);return 0;}
setOpacity(shield,c);
}
var ad = setInterval(“doAlpha()”,1);
this.doOk = function(){
//alertFram.style.display = “none”;
//shield.style.display = “none”;
document.body.removeChild(alertFram);
document.body.removeChild(shield);
eSrc.focus();
document.body.onselectstart = function(){return true;}
document.body.oncontextmenu = function(){return true;}
}
document.getElementById(“do_OK”).focus();
eSrc.blur();
document.body.onselectstart = function(){return false;}
document.body.oncontextmenu = function(){return false;}
}
</script>
</body>
</html>