js代码

<script src="js/layer.js"></script>
<script type="text/javascript">
			var lottery = {
				index: -1, //当前转动到哪个位置，起点位置
				count: 0, //总共有多少个位置
				timer: 0, //setTimeout的ID，用clearTimeout清除
				speed: 20, //初始转动速度
				times: 0, //转动次数
				cycle: 50, //转动基本次数：即至少需要转动多少次再进入抽奖环节
				prize: -1, //中奖位置
				init: function(id) {
					if($('#' + id).find('.lottery-unit').length > 0) {
						$lottery = $('#' + id);
						$units = $lottery.find('.lottery-unit');
						this.obj = $lottery;
						this.count = $units.length;
						$lottery.find('.lottery-unit.lottery-unit-' + this.index).addClass('active');
					};
				},
				roll: function() {
					var index = this.index;
					var count = this.count;
					var lottery = this.obj;
					$(lottery).find('.lottery-unit.lottery-unit-' + index).removeClass('active');
					index += 1;
					if(index > count - 1) {
						index = 0;
					};
					$(lottery).find('.lottery-unit.lottery-unit-' + index).addClass('active');
					this.index = index;
					return false;
				},
				stop: function(index) {
					this.prize = index;
					return false;
				}
			};

			function roll() {
				lottery.times += 1;
				lottery.roll(); //转动过程调用的是lottery的roll方法，这里是第一次调用初始化

				if(lottery.times > lottery.cycle + 10 && lottery.prize == lottery.index) {
					clearTimeout(lottery.timer);
				
					layer.open({
			           type: 1,			           
			           shadeClose: true,
			           shade: false,
			           maxmin: true, //开启最大化最小化按钮
			           area: ['893px', '600px'],
			           content: $("#info").html()
					});
					
					lottery.prize = -1;
					lottery.times = 0;
					click = false;
				} else {
					if(lottery.times < lottery.cycle) {
						lottery.speed -= 10;
					} else if(lottery.times == lottery.cycle) {
						var index = Math.random() * (lottery.count) | 0; //静态演示，随机产生一个奖品序号，实际需请求接口产生
						lottery.prize = index;
					} else {
						if(lottery.times > lottery.cycle + 10 && ((lottery.prize == 0 && lottery.index == 7) || lottery.prize == lottery.index + 1)) {
							lottery.speed += 110;
						} else {
							lottery.speed += 20;
						}
					}
					if(lottery.speed < 40) {
						lottery.speed = 40;
					};
					lottery.timer = setTimeout(roll, lottery.speed); //循环调用
				}
				return false;
			}

			var click = false;

			window.onload = function() {
				lottery.init('lottery');
				$('.draw-btn').click(function() {
					if(click) { //click控制一次抽奖过程中不能重复点击抽奖按钮，后面的点击不响应
						return false;

					} else {
						lottery.speed = 100;
						roll(); //转圈过程不响应click事件，会将click置为false
						click = true; //一次抽奖完成后，设置click为true，可继续抽奖		
						return false;
					}
				});
			};
</script>