【JS随机抽奖问题】

请大神看用什么方法把抽到了的号数不在被抽到。

<html>

<head>

<meta http-equiv="Content-Type" content="text/html; charset=GBK">

<script src="http://code.jquery.com/jquery-1.7.1.js" type="text/javascript"></script>

<style type="text/css">

body,h1,h2,h3,h4,h5,h6,p,ul,ol,li,form,img,dl,dt,dd,table,th,td,blockquote,fieldset,div,strong,label,em{margin:0;padding:0;border:0;}

ul,ol,li{list-style:none;}

input,button{margin:0;font-size:12px;vertical-align:middle;}

body{font-size:12px;font-family:Arial, Helvetica, sans-serif;  text-align:center; margin:0 auto; background:url(../images/BG.jpg) repeat-y;}

table{border-collapse:collapse;border-spacing:0;}

.box{ padding:9px 0 0 11px; width:759px; height:611px; background:#ccc; margin:20px auto; }

.inbox{ width:751px; height:596px;position:relative;}

#random_box li{ position:absolute; width:79px; 

overflow:hidden; height:69px; 

border:3px solid #c7c5ca; background:#fff;

    }

#random_box li img{ width:144px; display:block; height:144px;}

.ok{ display:block; width:442px; height:294px; background:#c00; color:#fff; font-size:48px; position:absolute; top:169px; left:148px; cursor:pointer; text-align:center; line-height:280px;}

#random_1{ left:0; top:0;}

#random_2{ left:90px;top:0;}

#random_3{ left:180px;top:0;}

#random_4{ left:270px;top:0;}

#random_5{ left:360px;top:0; }

#random_6{ left:450px;top:0;}

#random_7{ left:540px; top:0;}



#random_8{ left:630px; top:0;}

#random_9{ left:630px; top:80px;}

#random_10{ left:630px; top:160px;}

#random_11{ left:630px; top:240px;}

#random_12{ left:630px; top:320px;}

#random_13{ left:630px; top:400px;}

#random_14{ left:630px; top:480px;}

#random_15{ left:540px; top:480px;}

#random_16{ left:450px; top:480px;}

#random_17{ left:360px; top:480px;}

#random_18{ left:270px; top:480px;}

#random_19{ left:180px; top:480px;}

#random_20{ left:90px; top:480px;}

#random_21{ left:0px; top:480px;}



#random_22{ left:0; top:400px;}

#random_23{ left:0; top:320px;}

#random_24{ left:0; top:240px;}

#random_25{ left:0; top:160px;}

#random_26{ left:0; top:80px;}



#random_27{ left:90px; top:80px;}

 

#random_28{ left:180px; top:80px;}



#random_29{ left:270px; top:80px;}



#random_30{ left:360px; top:80px;}



 

#random_box li.random_current{border:1px solid red;background:#c00;}

</style>

</head>

<body>

<div class="box">

 <div class="inbox">

  <ul id="random_box">

   <li id="random_1">1</li>

   <li id="random_2">2</li>

   <li id="random_3">3</li>

   <li id="random_4">4</li>

   <li id="random_5">5</li>

   <li id="random_6">6</li>

   <li id="random_7">7</li>

    <li id="random_8">8</li>

   <li id="random_9">9</li>

   <li id="random_10">10</li>

   <li id="random_11">11</li>

   <li id="random_12">12</li>

      <li id="random_13">13</li>

   <li id="random_14">14</li>

   <li id="random_15">15</li>

   <li id="random_16">16</li> 

   <li id="random_17">17</li> 

     <li id="random_18">18</li> 

       <li id="random_19">19</li> 

          <li id="random_20">20</li> 

           <li id="random_21">21</li> 

               <li id="random_22">22</li> 

                        <li id="random_23">23</li> 

                         <li id="random_24">24</li> 

                          <li id="random_25">25</li> 

                          <li id="random_26">26</li> 

                           <li id="random_27">27</li> 

                           <li id="random_28">28</li> 

                           <li id="random_29">29</li> 

                           <li id="random_30">30</li> 

  </ul>

  <b class="ok" onClick="StartGame()">抽奖</b>

 </div>

</div>

<script>

var index=1,           //当前亮区位置

prevIndex=14,          //前一位置

Speed=300,           //初始速度

Time,            //定义对象

arr_length = 30; //GetSide(5,5),         //初始化数组

EndIndex=1,           //决定在哪一格变慢

cycle=0,           //转动圈数   

EndCycle=3,           //计算圈数

flag=false,           //结束转动标志

random_num=1,      //中奖数

quick=0;           //加速

   

   

function StartGame(){

$("#random_box li").removeClass("random_current"); //取消选中

   //random_num = parseInt($("#txtnum").val());//

   random_num = Math.floor(Math.random()*13+2); //产出随机中奖数2--12之间

   index=1; //再来一次,从1开始

   cycle=0;

   flag=false;

   //EndIndex=Math.floor(Math.random()*12);

   if(random_num>5) {

  EndIndex = random_num - 5; //前5格开始变慢

   } else {

  EndIndex = random_num + 14 - 5; //前5格开始变慢

   }

   //EndCycle=Math.floor(Math.random()*3);

   Time = setInterval(Star,Speed);

   

}

function Star(num){

    //跑马灯变速

    if(flag==false){

      //走五格开始加速

      if(quick==5){

         clearInterval(Time);

         Speed=50;

         Time=setInterval(Star,Speed);

      }

      //跑N圈减速

      if(cycle==EndCycle+1 && index-1==EndIndex){

      clearInterval(Time);

         Speed=300;

         flag=true;         //触发结束

         Time=setInterval(Star,Speed);

      }

    }

   

    if(index>arr_length){

        index=1;

        cycle++;

    }

   

   //结束转动并选中号码

   if(flag==true && index==parseInt(random_num)){ 

      quick=0;

      clearInterval(Time);

   }

   $("#random_"+index).addClass('random_current'); //设置当前选中样式

   if(index>1)

       prevIndex=index-1;

   else{

       prevIndex=arr_length;

   }

   $("#random_"+prevIndex).removeClass('random_current'); //取消上次选择样式 

   index++;

   quick++;

}

</script>

</body>

</html>

JS随机抽奖 --------------------编程问答-------------------- 得到一个数据后把那个list元素remove掉

补充：.NET技术 ,  ASP.NET