1 var num = 0; //当前点亮的灯 2   var circle = 0; //至少转跑马灯的圈数 3   var t; //定时器 4   var len;//奖品个数 5   function lightChange($prizes, changeClass, prizeArr, prizeNum){ 6       var self = this; 7       len = $prizes.length; 8  9       $prizes.removeClass(changeClass);10       $prizes.eq(prizeArr[num]).addClass(changeClass);11       if(num == len-1){12         num = 0;13         circle ++;14       } else {15         num ++;16       }17 18       if(circle == 2 && num == prizeNum){19         circle = 0;20         clearTimeout(t);21       } else {22         t = setTimeout(function(){lightChange($prizes, changeClass, prizeArr, prizeNum)},300); 23       }24     }