简单易扩展可控性强的Jquery转盘抽奖程序

<script type="text/javascript">var index = 1,  //当前亮区位置prevIndex = 14,  //前一位置Speed = 300,  //初始速度Time,   //计时器arr_length = 14,  //奖池奖品数量EndIndex = 1,  //决定在哪一格变慢cycle = 0,   //计算圈数  EndCycle = 3,  //转动多少圈后停下flag = false,  //结束转动标志random_num = 1,  //中奖的格子quick = 0;   //多少格后开始加速function StartGame(){ $("#random_box li").removeClass("random_current"); //产出随机中奖数1--14之间 //在实际应用中，中奖数应通过Ajax从后台获得，以确保中奖概率的可控性 random_num = Math.floor(Math.random() * 14 + 1); //从第一格开始转动 index = 1; //圈数计数器置0 cycle = 0; flag = false; //中奖格子前5格开始变慢 if(random_num > 10) {  EndIndex = random_num - 10;  } else {  EndIndex = random_num + arr_length - 10; } 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); } //跑指定圈数后开始减速 if(cycle == EndCycle + 1 && index - 1 == EndIndex){  clearInterval(Time);  Speed = 300;  //触发结束  flag = true;  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);  }  //设置当前选中样式  $("#random_"+index).addClass('random_current');   if(index > 1)    prevIndex = index - 1;  else{    prevIndex = arr_length;  }  //取消上次选择样式   $("#random_"+prevIndex).removeClass('random_current');   index ++;  quick ++;}</script>

<div class="box"> <div class="inbox"> <ul id="random_box">  <li id="random_1"><img src="images/img01.gif"></li>  <li id="random_2"><img src="images/img02.gif"></li>  <li id="random_3"><img src="images/ts.gif"></li>  <li id="random_4"><img src="images/img03.gif"></li>  <li id="random_5"><img src="images/img04.gif"></li>  <li id="random_6"><img src="images/ts.gif"></li>  <li id="random_7"><img src="images/img05.gif"></li>  <li id="random_8"><img src="images/img06.gif"></li>  <li id="random_9"><img src="images/img07.gif"></li>  <li id="random_10"><img src="images/ts.gif"></li>  <li id="random_11"><img src="images/img01.gif"></li>  <li id="random_12"><img src="images/img02.gif"></li>  <li id="random_13"><img src="images/ts.gif"></li>  <li id="random_14"><img src="images/img04.gif"></li>  </ul> <b class="ok" onclick="StartGame()">我要抽奖</b> </div></div>

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