JavaScript 实现右上角弹出提示信息 _JavaScript

JavaScript 实现右下角弹出提示信息
<!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>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>JavaScript实现网页右下角弹出窗口代码 - www.webdm.cn</title>
</head>
<style type="text/css">
#winpop { width:200px; height:0px; position:absolute; right:0; bottom:0; border:1px solid #666; margin:0; padding:1px; overflow:hidden; display:none;}
#winpop .title { width:100%; height:22px; line-height:20px; background:#FFCC00; font-weight:bold; text-align:center; font-size:12px;}
#winpop .con { width:100%; height:90px; line-height:80px; font-weight:bold; font-size:12px; color:#FF0000; text-decoration:underline; text-align:center} /* http://www.webdm.cn */
#silu { font-size:12px; color:#666; position:absolute; right:0; text-align:right; text-decoration:underline; line-height:22px;}
.close { position:absolute; right:4px; top:-1px; color:#FFF; cursor:pointer}
</style>
<script type="text/javascript">
function tips_pop(){
  var MsgPop=document.getElementById("winpop");
  var popH=parseInt(MsgPop.style.height);//将对象的高度转化为数字
   if (popH==0){
   MsgPop.style.display="block";//显示隐藏的窗口
  show=setInterval("changeH('up')",2);
   }
  else { 
   hide=setInterval("changeH('down')",2);
  }
}
function changeH(str) {
 var MsgPop=document.getElementById("winpop");
 var popH=parseInt(MsgPop.style.height);
 if(str=="up"){
  if (popH<=100){
  MsgPop.style.height=(popH+4).toString()+"px";
  }
  else{  
  clearInterval(show);
  }
 }
 if(str=="down"){ 
  if (popH>=4){  
  MsgPop.style.height=(popH-4).toString()+"px";
  }
  else{ 
  clearInterval(hide);   
  MsgPop.style.display="none";  //隐藏DIV
  }
 }
}
window.onload=function(){//加载
document.getElementById('winpop').style.height='0px';
setTimeout("tips_pop()",800);//3秒后调用tips_pop()这个函数
}
</script>
<body>
<div id="silu">
<button onclick="tips_pop()">3秒后会在右下角自动弹出窗口，如果没有弹出请点击这个按钮</button>
</div>
<div id="winpop">
 <div class="title">您有新的短消息！<span class="close" onclick="tips_pop()">X</span></div>
    <div class="con">1条未读信息(</div>
</div>
</body>
</html>

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