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下面我們來分享一個九宮格抽獎特效

特效說明：

一款jQuery九宮格大轉盤抽獎代碼網頁特效，點擊抽獎按鈕開始隨機抽獎選擇獎品，可設置起點位置、獎品數量、轉動次數、中獎位置參數。（兼容測試：IE7及以上、Firefox、Chrome、Opera、Safari、360等主流瀏覽器）

HTML:

<效果html開始-->
<div id="lottery">
	<table border="0" cellpadding="0" cellspacing="0">
		<tr>
			<td class="lottery-unit lottery-unit-0"><img src="http://www.gimoo.net/t/1904/images/1.png"></td>
			<td class="lottery-unit lottery-unit-1"><img src="http://www.gimoo.net/t/1904/images/2.png"></td>
			<td class="lottery-unit lottery-unit-2"><img src="http://www.gimoo.net/t/1904/images/4.png"></td>
   <td class="lottery-unit lottery-unit-3"><img src="http://www.gimoo.net/t/1904/images/3.png"></td>
		</tr>
		<tr>
			<td class="lottery-unit lottery-unit-11"><img src="http://www.gimoo.net/t/1904/images/7.png"></td>
			<td colspan="2" rowspan="2"><a ></a></td>
			<td class="lottery-unit lottery-unit-4"><img src="http://www.gimoo.net/t/1904/images/5.png"></td>
		</tr>
		<tr>
			<td class="lottery-unit lottery-unit-10"><img src="http://www.gimoo.net/t/1904/images/1.png"></td>
			<td class="lottery-unit lottery-unit-5"><img src="http://www.gimoo.net/t/1904/images/6.png"></td>
		</tr>
  <tr>
			<td class="lottery-unit lottery-unit-9"><img src="http://www.gimoo.net/t/1904/images/3.png"></td>
			<td class="lottery-unit lottery-unit-8"><img src="http://www.gimoo.net/t/1904/images/6.png"></td>
			<td class="lottery-unit lottery-unit-7"><img src="http://www.gimoo.net/t/1904/images/8.png"></td>
   <td class="lottery-unit lottery-unit-6"><img src="http://www.gimoo.net/t/1904/images/7.png"></td>
		</tr>
	</table>
</div>

js部分

<script type="text/javascript" src="http://www.gimoo.net/t/1904/jquery-1.8.3.min.js"></script>
<script type="text/javascript">
var lottery={
	index:-1,	//當前轉動到哪個位置，起點位置
	count:0,	//總共有多少個位置
	timer:0,	//setTimeout的ID，用clearTimeout清除
	speed:20,	//初始轉動速度
	times:0,	//轉動次數
	cycle:50,	//轉動基本次數：即至少需要轉動多少次再進入抽獎環節
	prize:-1,	//中獎位置
	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();
	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;
			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);
	}
	return false;
}

var click=false;

window.onload=function(){
	lottery.init('lottery');
	$("#lottery a").click(function(){
		if (click) {
			return false;
		}else{
			lottery.speed=100;
			roll();
			click=true;
			return false;
		}
	});
};
</script>

CSS部分

/* 效果CSS開始 */
#lottery{width:574px;height:584px;margin:0px auto;background:url(../images/bg.jpg) no-repeat;padding:50px 55px;}
#lottery table td{width:142px;height:142px;text-align:center;vertical-align:middle;font-size:24px;color:#333;font-index:-999}
#lottery table td a{width:284px;height:284px;line-height:150px;display:block;text-decoration:none;}
#lottery table td.active{background-color:#ea0000;}
/* 效果CSS結束 */

JS中可設置參數：

index:-1, //當前轉動到哪個位置，起點位置
count:0, //總共有多少個位置
timer:0, //setTimeout的ID，用clearTimeout清除
speed:20, //初始轉動速度
times:0, //轉動次數
cycle:50, //轉動基本次數：即至少需要轉動多少次再進入抽獎環節
prize:-1, //中獎位置

最后奉上演示圖