用javascript实现改善用户体验之alert提示效果

类似于新浪邮箱的提示效果。比较独立。在wenming版主的帮助下，已解决了高度不能适应的BUG。使用方法很简单，在需要弹出提示的页面先引用alert.js脚本文件,如:
程序代码
<script type="text/javascript" src="alert.js"></script>
然后直接在需要提出处使用：
程序代码
sAlert("需要提示的信息");
即可.不需要额外添加HTML代码.
完整代码:

<!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> 
            phpStudy</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> 
        <div class="rightClass"> 
        </div>     
    </div> 
                <script type="text/javascript" language="javascript">

//Author:Daviv 
//Blog:jxdawei" target="_blank">http://blog.163.com/jxdawei</a> 
//Date:2006-10-27 
//Email:jxdawei@gmail.com

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=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 ="25px"; 
            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.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); 
            } 
        </script> 
    </body> 
</html>

[Ctrl+A 全选注:如需引入外部Js需刷新才能执行]

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