功能：替换传统弹出窗口提示 window.alert("");
好处：界面美观，友善(最起码没有系统报警的声音）。
引用方便，纯js脚本文件实现所有效果。
使用方法：
<!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>
<title>Alert提示效果脚本</title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<meta http-equiv="Content-Language" content="gb2312" />
<meta name="KeyWords" content="电力工程造价,价格信息,装材,设备,电力工程" />
<meta name="description" content="电力工程造价信息" />
<script type="text/javascript" src="alert.js"></script>
<style type="text/css">
*{}{
margin:0;padding:0;
}
</style>
</head>
<body>
<div class="cecmbody" id="cecmpolicy">
<div class="leftClass">
<p>测试</p><p>测试</p><p>测试</p>
<p>测试</p><p>测试</p><p>测试</p>
<p>测试</p><p>测试</p><p>测试</p>
<input type="button" value="点击这里" onclick="sAlert('测试效果');" />
<p>测试</p><p>测试</p><p>测试</p>
<p>测试</p><p>测试</p><p>测试</p>
<p>测试</p><p>测试</p><p>测试</p>
</div>
<div class="rightClass">
</div>
</div>
</body>
</html>
脚本文件alert.js
/**//*
作者：Daviv
博客：http://blog.163.com/jxdawei
时间：2006-10-27
感谢：wenming (Blueidea)
功能：弹出提示
方法：调用sAlert("您要弹出的信息");
*/
function sAlert(str){
var msgw,msgh,bordercolor;
msgw=400;//提示窗口的宽度
msgh=100;//提示窗口的高度
titleheight=25 //提示窗口标题高度
bordercolor="#336699";//提示窗口的边框颜色
titlecolor="#99CCFF";//提示窗口的标题颜色
var sWidth,sHeight;
sWidth=document.body.offsetWidth;
sHeight=document.body.offsetHeight;
if (sHeight<screen.height)
{
sHeight=screen.height;
}
var bgObj=document.createElement("div");
bgObj.setAttribute('id','bgDiv');
bgObj.style.position="absolute";
bgObj.style.top="0";
bgObj.style.background="#777";
bgObj.style.filter="progid:DXImageTransform.Microsoft.Alpha(style=3,opacity=25,finishOpacity=75";
bgObj.style.opacity="0.6";
bgObj.style.left="0";
bgObj.style.width=sWidth + "px";
bgObj.style.height=sHeight + "px";
bgObj.style.zIndex = "10000";
document.body.appendChild(bgObj);
var msgObj=document.createElement("div")
msgObj.setAttribute("id","msgDiv");
msgObj.setAttribute("align","center");
msgObj.style.background="white";
msgObj.style.border="1px solid " + bordercolor;
msgObj.style.position = "absolute";
msgObj.style.left = "50%";
msgObj.style.top = "50%";
msgObj.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";
msgObj.style.marginLeft = "-225px" ;
msgObj.style.marginTop = -75+document.documentElement.scrollTop+"px";
msgObj.style.width = msgw + "px";
msgObj.style.height =msgh + "px";
msgObj.style.textAlign = "center";
msgObj.style.lineHeight = (msgh-titleheight) + "px";
msgObj.style.zIndex = "10001";
var title=document.createElement("h4");
title.setAttribute("id","msgTitle");
title.setAttribute("align","right");
title.style.margin="0";
title.style.padding="3px";
title.style.background=bordercolor;
title.style.filter="progid:DXImageTransform.Microsoft.Alpha(startX=20, startY=20, finishX=100, finishY=100,style=1,opacity=75,finishOpacity=100);";
title.style.opacity="0.75";
title.style.border="1px solid " + bordercolor;
title.style.height="18px";
title.style.font="12px Verdana, Geneva, Arial, Helvetica, sans-serif";
title.style.color="white";
title.style.cursor="pointer";
title.innerHTML="关闭";
title.onclick=function(){
document.body.removeChild(bgObj);
document.getElementById("msgDiv").removeChild(title);
document.body.removeChild(msgObj);
}
document.body.style.overflow = "hidden";
document.body.appendChild(msgObj);
document.getElementById("msgDiv").appendChild(title);
var txt=document.createElement("p");
txt.style.margin="1em 0"
txt.setAttribute("id","msgTxt");
txt.innerHTML=str;
document.getElementById("msgDiv").appendChild(txt);
}