<!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">
<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> window.onload = function () {alert(‘打开页面自动弹出框！‘);}</script>
<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>
本文出自 “随风飞随风停” 博客，请务必保留此出处http://hww9011.blog.51cto.com/3545422/1582154
原文：http://hww9011.blog.51cto.com/3545422/1582154