JS实现定时页面弹出类似QQ新闻的提示框

还是在做联通IOM项目时遇到的一个需求,要求页面每隔半小时弹出一次提示消息（消息以类似QQ新闻的形式弹出）。当时上网找的这么一个资料，已经不记得原文出处了


代码如下:

<html>
<head>
<title>JavaScript提示框</title>

<script type="text/javascript">
<!--

/**
* 类名：CLASS_MSN_MESSAGE
* 功能：提供类似MSN消息框
* 示例：
* var MSG = new CLASS_MSN_MESSAGE("aa",200,120,"短消息提示：","您有1封消息","今天请我吃饭哈");
* MSG.show();
* 消息构造
*/
function CLASS_MSN_MESSAGE(id,width,height,caption,title,message,target,action){
this.id = id;
this.title = title;
this.caption = caption;
this.message = message;
this.target = target;
this.action = action;
this.width = width?width:200;
this.height = height?height:120;
this.timeout = 150;
this.speed = 20;
this.step = 1;
this.right = screen.width -1;
this.bottom = screen.height;
this.left = this.right - this.width;
this.top = this.bottom - this.height;
this.timer = 0;
this.pause = false;
this.close = false;
this.autoHide = true;
}

/**
* 隐藏消息方法
*/
CLASS_MSN_MESSAGE.prototype.hide = function(){
if(this.onunload()){
var offset = this.height>this.bottom-this.top?this.height:this.bottom-this.top;
var me = this;
if(this.timer>0){
window.clearInterval(me.timer);
}

var fun = function(){
if(me.pause==false||me.close){
var x = me.left;
var y = 0;
var width = me.width;
var height = 0;
if(me.offset>0){
height = me.offset;
}
y = me.bottom - height;
if(y>=me.bottom){
window.clearInterval(me.timer);
} else {
me.offset = me.offset - me.step;
}
me.Pop.show(x,y,width,height);
}
}
this.timer = window.setInterval(fun,this.speed)
}
}

/**
* 消息卸载事件，可以重写
*/
CLASS_MSN_MESSAGE.prototype.onunload = function() {
return true;
}
/**
* 消息命令事件，要实现自己的连接，请重写它
*/
CLASS_MSN_MESSAGE.prototype.oncommand = function(){
this.close = true;
this.hide();
window.open("http://www.lost63.com");
}
/**
* 消息显示方法
*/
CLASS_MSN_MESSAGE.prototype.show = function(){
var oPopup = window.createPopup(); //IE5.5+
this.Pop = oPopup;

var w = this.width;
var h = this.height;

// "×"关闭按钮
/*
str += "<tr>"
str += "<td style='font-size: 12px;color: #0f2c8c' width=30 height=24></td>"
str += "<td style='padding-left: 4px; font-weight: normal; font-size: 12px; color: #1f336b; padding-top: 4px' valign=center width='100%'>" + this.caption + "</td>"
str += "<td style='padding-right: 2px; padding-top: 2px' valign=center align=right width=19>"
str += "<span title=关闭 style='font-weight: bold; font-size: 12px; cursor: hand; color: red; margin-right: 4px' id='btsysclose' >×</span></td>"
str += "</tr>"
*/
// 按钮style
// style='width:60px; height:20px; border-right: #002D96 1px solid; padding-right: 2px; border-top: #002D96 1px solid; padding-left: 2px; FONT-SIZE: 12px; filter: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr=#FFFFFF, EndColorStr=#9DBCEA); border-left: #002D96 1px solid; CURSOR: hand; color: black; padding-top: 2px; border-bottom: #002D96 1px solid;'

var str = "<div style='border-right: #455690 1px solid; border-top: #a6b4cf 1px solid; z-index: 99999; left: 0px; border-left: #a6b4cf 1px solid; width: " + w + "px; border-bottom: #455690 1px solid; position: absolute; top: 0px; height: " + h + "px; background-color: #c9d3f3'>"
str += "<table style='border-top: #ffffff 1px solid; border-left: #ffffff 1px solid' cellspacing=0 cellpadding=0 width='100%' bgcolor=#cfdef4 border=0>"

str += "<tr>"
str += "<td style='font-size: 12px;color: #0f2c8c' width=30 height=24></td>"
str += "<td style='padding-left: 4px; font-weight: normal; font-size: 12px; color: #1f336b; padding-top: 4px' valign=center width='100%'>" + this.caption + "</td>"
str += "</tr>"
str += "<tr>"
/*height：设置里面内容区域的高度 */
str += "<td style='padding-right: 1px;padding-bottom: 1px' colspan=3 height=" + (h-50) + ">"
str += "<div style='border-right: #b9c9ef 1px solid; padding-right: 8px; border-top: #728eb8 1px solid; padding-left: 8px; font-size: 12px; padding-bottom: 8px; border-left: #728eb8 1px solid; width: 100%; color: #1f336b; padding-top: 8px; border-bottom: #b9c9ef 1px solid; height: 100%'>" + this.title + "<br><br>"
str += "<div style='word-break: break-all' align=left><a href='javascript:void(0)' hidefocus=false id='btcommand'><font color=#ff0000>" + this.message + "</font></a> - <a href='tencent://message/?uin=380522459&site=http://hi.baidu.com/lupeng0527&menu=yes' hidefocus=false id='ommand'><font color=#ff0000>有事您q我!</font></a></div>"
str += "</div>"
str += "</td>"
str += "</tr>"
str += "<tr align=center>"
str += "<td colspan=3>"
str += "<div style='padding: 2 0 2 0;'>"
str += "<span id='buttonClose'><input type='button' title=关闭 value=确认 style='width:60px; height:20px; border-right: #002D96 1px solid; padding-right: 2px; border-top: #002D96 1px solid; padding-left: 2px; FONT-SIZE: 12px; filter: progid:DXImageTransform.Microsoft.Gradient(GradientType=0, StartColorStr=#FFFFFF, EndColorStr=#9DBCEA); border-left: #002D96 1px solid; CURSOR: hand; color: black; padding-top: 2px; border-bottom: #002D96 1px solid;'></span>"
str += "</div>"
str += "</td>"
str += "</tr>"
str += "</table>"
str += "</div>"

oPopup.document.body.innerHTML = str;
this.offset = 0;
var me = this;

oPopup.document.body.onmouseover = function(){me.pause=true;}
oPopup.document.body.onmouseout = function(){me.pause=true;}

var fun = function(){
var x = me.left;
var y = 0;
var width = me.width;
var height = me.height;

if(me.offset>me.height){
height = me.height;
} else {
height = me.offset;
}

y = me.bottom - me.offset;
if(y<=me.top){
//me.timeout--;
if(me.timeout==0){
window.clearInterval(me.timer);
if(me.autoHide){
me.hide();
}
}
} else {
me.offset = me.offset + me.step;
}
me.Pop.show(x,y,width,height);
}

this.timer = window.setInterval(fun,this.speed)

//"确认"关闭事件

var buttonClose = oPopup.document.getElementById("buttonClose");
buttonClose.onclick = function(){
me.close = true;
me.hide();
}
/*
* "×"关闭事件
* var btClose = oPopup.document.getElementById("btSysClose");
*
* btClose.onclick = function(){
* me.close = true;
* me.hide();
* }
*/

var btCommand = oPopup.document.getElementById("btCommand");
btCommand.onclick = function(){
me.oncommand();
}
var ommand = oPopup.document.getElementById("ommand");
ommand.onclick = function(){
this.close = true;
me.hide();
window.open(ommand.href);
}
}
/*
* 设置速度方法
*/
CLASS_MSN_MESSAGE.prototype.speed = function(s){
var t = 20;
try {
t = praseInt(s);
} catch(e){}
this.speed = t;
}
/**
* 设置步长方法
*/
CLASS_MSN_MESSAGE.prototype.step = function(s){
var t = 1;
try {
t = praseInt(s);
} catch(e){}
this.step = t;
}

CLASS_MSN_MESSAGE.prototype.rect = function(left,right,top,bottom){
try {
this.left = left !=null?left:this.right-this.width;
this.right = right !=null?right:this.left +this.width;
this.bottom = bottom!=null?(bottom>screen.height?screen.height:bottom):screen.height;
this.top = top !=null?top:this.bottom - this.height;
} catch(e){}
}
var MSG1 = new CLASS_MSN_MESSAGE("aa",240,150,"管理员：","思路决定出路","迷失路上");
MSG1.rect(null,null,null,screen.height-50);
MSG1.speed = 10;
MSG1.step = 5;
//alert(MSG1.top);
//MSG1.show();
//同时两个有闪烁，只能用层代替了，不过层不跨框架
/*
var MSG2 = new CLASS_MSN_MESSAGE("aa",200,120,"短消息提示：","您有2封消息","好的啊");
MSG2.rect(100,null,null,screen.height);
MSG2.show();
*/

/**
* 显示提示框
*/
function showMSG(){
MSG1.show();
}

</script>
</head>

<body>
<center>
<bgsound src="" id="bs" loop="no">
<input type="button" value="按钮" onclick="showMSG(); ">
<br>
<hr>
</center>
</body>
</html>