js抽奖程序（跑马灯效果）

function GetSide(m, n) {
    //初始化数组
    var arr = [];
    for (var i = 0; i       arr.push([]);
       for (var j = 0; j            arr[i][j]= i * n + j;
       }
    }
    //获取数组最外圈
    var resultArr =[];
    var tempX = 0,
tempY = 0,
direction = "Along",
count = 0;
    while (tempX>= 0 && tempX= 0 && tempY       count++;
       resultArr.push([tempY, tempX]);
       if (direction == "Along") {
           if (tempX== n - 1)
              tempY++;
           else
              tempX++;
           if (tempX== n - 1 && tempY == m - 1)
              direction = "Inverse"
       }
       else {
           if (tempX== 0)
              tempY--;
           else
              tempX--;
           if (tempX== 0 && tempY == 0)
              break;
       }
    }
    return resultArr;
}

$(document).ready(function () {
    var index = 0,         //当前亮区位置
      prevIndex = 0,        //前一位置
      Speed = 300,         //初始速度
      Time,          //定义对象
      arr = GetSide(5, 5),       //初始化数组
      EndIndex = 0,         //决定在哪一格变慢
      cycle = 0,          //转动圈数  
      EndCycle = 0,         //计算圈数
      flag = false,         //结束转动标志 
      quick = 0,         //加速
      gameTable =document.getElementByIdx_x("gameTable");
   $("#gameBtn").click(function () {
       var stopNum = Math.floor(Math.random() * 15 +1);//点击产生随机数，最后将停在次数上
       $.COOKIE("stopNum",stopNum);//存入COOKIE,使得全局可以调用
       $(this).hide(); //开始后隐藏开始按钮
       $(this).parent().addClass("waitGame");
       cycle = 0;
       flag = false;
       EndIndex = Math.floor(Math.random() * 16);
       EndCycle = 1;
       Time = setInterval(Star, Speed);
    });

    function Star(num){
      gameTable.rows[arr[index][0]].cells[arr[index][1]].style.border ="1px solid pink";
      gameTable.rows[arr[index][0]].cells[arr[index][1]].style.background= "pink";
       if (index > 0) {
           prevIndex= index - 1;
       }
       else {
           prevIndex= arr.length - 1;
       }
      gameTable.rows[arr[prevIndex][0]].cells[arr[prevIndex][1]].style.border= "1px solid #ffdd99";
      gameTable.rows[arr[prevIndex][0]].cells[arr[prevIndex][1]].style.background= "#fff9ed";
       index++;
       quick++;

       if (index >= arr.length) {
           index =0;
          cycle++;
       }

       //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 ==EndIndex) {
              clearInterval(Time);
              Speed = 300;
              flag = true;       //触发结束
              Time = setInterval(Star,Speed);
           }
       }
       if (flag == true&& index == $.COOKIE("stopNum") -1) {
           quick =0;
          clearInterval(Time);
          $("#gameContent p").removeClass("waitGame");
          $("#gameBtn").show(); //停止后显示开始按钮
       }
    }
})