JavaScript自动关闭弹出提示窗口

前两天有个需求,客户不想点击提示框,本来想重写alert或者confirm提示了,太麻烦了,就在网上找了一个现成的demo,改了改.
<html>
<head>
<title>JavaScript自动关闭窗口</title>
<meta http-equiv="content-Type" content="text/html;charset=gb2312">
</head>
<body>   
<input type="button" value="弹出alert框自动关闭" onClick="Alert('正在提取数据生成您所需要的资质申请表文件,根据您的网络情况可能需要几分钟时间,请您稍候......')">  
<script>
//自动关闭提示框  
function Alert(str) {  
    var msgw,msgh,bordercolor;  
    msgw=350;//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="#666";//提示窗口的边框颜色  
    titlecolor="#BCD";//提示窗口的标题颜色  
    var sWidth,sHeight;  
    //获取当前窗口尺寸  
    sWidth = document.body.offsetWidth;  
    sHeight = document.body.offsetHeight;  
//    //背景div  
    var bgObj=document.createElement("div");  
    bgObj.setAttribute('id','alertbgDiv');  
    bgObj.style.position="absolute";  
    bgObj.style.top="0";  
    bgObj.style.background="#FFF";  
    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);  
    //创建提示窗口的div  
    var msgObj = document.createElement("div")  
    msgObj.setAttribute("id","alertmsgDiv");  
    msgObj.setAttribute("align","center");  
    msgObj.style.background="white";  
    msgObj.style.border="1px solid " + bordercolor;  
    msgObj.style.position = "absolute";  
    msgObj.style.left = "50%";  
    msgObj.style.font="12px/1.6em Verdana, Geneva, Arial, Helvetica, sans-serif";  
    //窗口距离左侧和顶端的距离   
    msgObj.style.marginLeft = "-225px";  
    //窗口被卷去的高+（屏幕可用工作区高/2）-150  
    msgObj.style.top = document.body.scrollTop+(window.screen.availHeight/2)-150 +"px";  
    msgObj.style.width = msgw + "px";  
    msgObj.style.height = msgh + "px";  
    msgObj.style.textAlign = "center";  
    msgObj.style.lineHeight ="25px";  
    msgObj.style.zIndex = "10001";  
    document.body.appendChild(msgObj);  
    //提示信息标题  
    var title=document.createElement("h4");  
    title.setAttribute("id","alertmsgTitle");  
    title.setAttribute("align","left");  
    title.style.margin="0";  
    title.style.padding="3px";  
    title.style.background = "#D1E9F7";  
    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="black";  
    title.innerHTML="提示信息!";  
    document.getElementById("alertmsgDiv").appendChild(title);  
    //提示信息  
    var txt = document.createElement("p");  
    txt.setAttribute("id","msgTxt");  
    txt.style.margin="16px 0";  
    txt.innerHTML = str;  
    document.getElementById("alertmsgDiv").appendChild(txt);  
    //设置关闭时间  
    window.setTimeout("closewin()",10000);   
}  
function closewin() {  
    document.body.removeChild(document.getElementById("alertbgDiv"));  
    document.getElementById("alertmsgDiv").removeChild(document.getElementById("alertmsgTitle"));  
    document.body.removeChild(document.getElementById("alertmsgDiv"));  
}
</script>
</body>   
</html>
JavaScript自动关闭弹出提示窗口

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