jquery实现九宫格大转盘抽奖

下面我们来分享一个九宫格抽奖特效

特效说明：

一款jQuery九宫格大转盘抽奖代码网页特效，点击抽奖按钮开始随机抽奖选择奖品，可设置起点位置、奖品数量、转动次数、中奖位置参数。（兼容测试：IE7及以上、Firefox、Chrome、Opera、Safari、360等主流浏览器）

HTML:

<!--效果html开始-->
<div id="lottery">
    <table border="0" cellpadding="0" cellspacing="0">
        <tr>
            <td class="lottery-unit lottery-unit-0"><img src="images/1.png"></td>
            <td class="lottery-unit lottery-unit-1"><img src="images/2.png"></td>
            <td class="lottery-unit lottery-unit-2"><img src="images/4.png"></td>
   <td class="lottery-unit lottery-unit-3"><img src="images/3.png"></td>
        </tr>
        <tr>
            <td class="lottery-unit lottery-unit-11"><img src="images/7.png"></td>
            <td colspan="2" rowspan="2"><a href="#"></a></td>
            <td class="lottery-unit lottery-unit-4"><img src="images/5.png"></td>
        </tr>
        <tr>
            <td class="lottery-unit lottery-unit-10"><img src="images/1.png"></td>
            <td class="lottery-unit lottery-unit-5"><img src="images/6.png"></td>
        </tr>
  <tr>
            <td class="lottery-unit lottery-unit-9"><img src="images/3.png"></td>
            <td class="lottery-unit lottery-unit-8"><img src="images/6.png"></td>
            <td class="lottery-unit lottery-unit-7"><img src="images/8.png"></td>
   <td class="lottery-unit lottery-unit-6"><img src="images/7.png"></td>
        </tr>
    </table>
</div>

js部分

<script type="text/javascript" src="jquery-1.8.3.min.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-"+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开始 */
#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结束 */

JS中可设置参数：

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

最后奉上演示图