可自动关闭的JS消息提示框

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Js代码  
//自动关闭提示框  
function Alert(str) {  
    var msgw,msgh,bordercolor;  
    msgw=350;//提示窗口的宽度  
    msgh=80;//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;  
    //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="#E8E8E8";  
    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 = 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.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()",2000);   
}  
function closewin() {  
    document.body.removeChild(document.getElementById("alertbgDiv"));  
    document.getElementById("alertmsgDiv").removeChild(document.getElementById("alertmsgTitle"));  
    document.body.removeChild(document.getElementById("alertmsgDiv"));  
}  

使用方法直接调用Alert('提示信息')即可，如下：

Html代码  
     function form_check(){  
     if(document.form1.user.value==""){Alert("请输入用户名！");document.form1.user.focus();return (false);}  
     if(document.form1.password.value==""){Alert("请输入密码！");document.form1.password.focus();return (false);}  
     }  
</script>  
  
<form name="form1" onsubmit="return form_check();" method="post" action="login.asp">   
用户名： <input name="user" type="text" id="user"/>  
密码： <input name="password" type="password" id="password" />  
<INPUT id=btnEnter type=image src="images/login.gif" name=btnEnter>   

下面是完整的例子

<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('不点击确定三秒后自动关闭')">  <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=80;//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;      //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="#E8E8E8";      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 = 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.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()",2000);   }  function closewin() {      document.body.removeChild(document.getElementById("alertbgDiv"));      document.getElementById("alertmsgDiv").removeChild(document.getElementById("alertmsgTitle"));      document.body.removeChild(document.getElementById("alertmsgDiv"));  }</script></body>   </html>