JavaScript与jQuery实现360风格开机倒计时动画

<!DOCTYPE html>
<html>
<head>
 <title>仿360开机效果</title>
 <meta charset="utf-8">
 <style type="text/css">
  *{
   padding: 0;
   margin: 0;
  }
  .box{
   width: 320px;
   position: fixed;
   bottom: 0;
   right: 0;
   box-shadow: 1px 1px 10px #2d2d2d;
  }
  #close{
   position: absolute;
   top: 0;
   right: 0;
   width: 30px;
   height: 20px;
   cursor: pointer;
   background-color: red;
   color: pink;
   font-weight: bold;
   text-align: center;
  }
  .hd{
   width: 320px;
   height: 300px;
   background-color: #03c03c;
   color: #fff;
   font-size: 70px;
   line-height: 300px;
   text-align: center;
  }
  .bd{
   width: 320px;
   height: 100px;
   background-color: #fffc00;
   font-size: 30px;
   line-height: 100px;
   text-align: center;
  }
 </style>
</head>
<body>
<div class="box">
 <span id="close">X</span>
 <div class="hd" id="t">1分12秒</div>
 <div class="bd" id="b">天气：晴天</div>
</div>
<!-- 引入jQuery -->
<script type="text/javascript" src="./jquery1.0.0.1.js"></script>
<script type="text/javascript">
 window.onload = function(){
  var close = document.getElementById("close");
  var box = close.parentNode;
  var b = document.getElementById("b");
  // 给关闭按钮绑定点击事件
  close.onclick = function(){
   animate(b, {"height":0}, function(){
    animate(box,{"width":0});
   });
   close.style.display = "none";
  }
 }
</script>
</body>
</html>

<script type="text/javascript">
var maxtime = 1350057600 //截止到的日期
var now=parseInt((new Date().getTime())/1000);//获取当前的日期
var cha_time=maxtime-now;//中间所差的时间

function CountDown(){ 
if(cha_time>=0){
var day = Math.floor(cha_time/3600/24);
var hour= Math.floor((cha_time/3600)%24);
var minutes = Math.floor((cha_time/60)%60); 
var seconds = Math.floor(cha_time%60); 
msg = "离结束还有"+day+"天"+hour+"小时"+minutes+"分"+seconds+"秒"; 
$(".ws_sg_con_big,.ws_sg_con_small").find("dd").html(msg);
--cha_time; 
} 
else{ 
clearInterval(timer); 
alert("时间到，结束!"); 
} 
} 
timer = setInterval("CountDown()",1000); 
</script>