jQuery九宫格抽奖特效js代码

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以下是 jQuery九宫格抽奖特效js代码的示例演示效果:

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部分效果截图:

HTML代码(index.html):

<!DOCTYPE html>
<html lang="zh">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1"> 
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>jQuery九宫格抽奖特效</title>
<style type="text/css">
	#lottery{width:570px;height:510px;margin:0px auto;border:4px solid #ba1809;}
	#lottery table{background-color:yellow;}
	#lottery table td{position:relative;width:190px;height:170px;text-align:center;color:#333;font-index:-999}
	#lottery table td img{display:block;width:190px;height:170px;}
	#lottery table td a{width:190px;height:170px;display:block;text-decoration:none;background:url(img/9.jpg) no-repeat top center;}
	#lottery table td a:hover{background-image:url(img/11.jpg);}
	#lottery table td.active .mask{display:block;}
	.mask{
		width:100%;
		height:100%;
		position:absolute;
		left:0;
		top:0;
		background-color: rgba(252,211,4,0.5);
		display:none;
	}
</style>

</head>
<body><br>

<div id="lottery">
	<table border="0" cellpadding="0" cellspacing="0">
		<tr>
			<td class="lottery-unit lottery-unit-0"><img src="img/1.jpg"><div class="mask"></div></td>
			<td class="lottery-unit lottery-unit-1"><img src="img/2.jpg"><div class="mask"></div></td>
			<td class="lottery-unit lottery-unit-2"><img src="img/3.jpg"><div class="mask"></div></td>
		</tr>
		<tr>
			<td class="lottery-unit lottery-unit-7"><img src="img/4.jpg"><div class="mask"></div></td>
			<td><a href="#"></a></td>
			<td class="lottery-unit lottery-unit-3"><img src="img/5.jpg"><div class="mask"></div></td>
		</tr>
		<tr>
			<td class="lottery-unit lottery-unit-6"><img src="img/6.jpg"><div class="mask"></div></td>
			<td class="lottery-unit lottery-unit-5"><img src="img/7.jpg"><div class="mask"></div></td>
			<td class="lottery-unit lottery-unit-4"><img src="img/8.jpg"><div class="mask"></div></td>
		</tr>
	</table>
</div>

<script src="js/jquery-1.11.0.min.js" type="text/javascript"></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-"+this.index).addClass("active");
			};
		},
		roll:function(){
			var index = this.index;
			var count = this.count;
			var lottery = this.obj;
			$(lottery).find(".lottery-unit-"+index).removeClass("active");
			index += 1;
			if (index>count-1) {
				index = 0;
			};
			$(lottery).find(".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);
			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;//中奖物品通过一个随机数生成
				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;
			};
			//console.log(lottery.times+'^^^^^^'+lottery.speed+'^^^^^^^'+lottery.prize);
			lottery.timer = setTimeout(roll,lottery.speed);//循环调用
		}
		return false;
	}

	var click=false;

	window.onload=function(){
		lottery.init('lottery');
		$("#lottery a").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>
</body>
</html>

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