简单的抽奖实现

简单的抽奖

<!DOCTYPE html>
<html>
<head>
    <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
    <title>抽奖</title>

    <style>
        #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(http://demo.sc.chinaz.com//Files/DownLoad/webjs1/201611/jiaoben4665/lottery1.jpg) no-repeat top center;}
        #lottery table td a:hover{background-image:url(http://demo.sc.chinaz.com//Files/DownLoad/webjs1/201611/jiaoben4665/lottery2.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>
<div id="lottery">
    <table border="0" cellpadding="0" cellspacing="0">
        <tr>
            <td class="lottery-unit lottery-unit-0"><img src="http://demo.sc.chinaz.com//Files/DownLoad/webjs1/201611/jiaoben4665/gift0.jpg"><div class="mask"></div></td>
            <td class="lottery-unit lottery-unit-1"><img src="http://demo.sc.chinaz.com//Files/DownLoad/webjs1/201611/jiaoben4665/gift1.jpg"><div class="mask"></div></td>
            <td class="lottery-unit lottery-unit-2"><img src="http://demo.sc.chinaz.com//Files/DownLoad/webjs1/201611/jiaoben4665/gift2.jpg"><div class="mask"></div></td>
        </tr>
        <tr>
            <td class="lottery-unit lottery-unit-7"><img src="http://demo.sc.chinaz.com//Files/DownLoad/webjs1/201611/jiaoben4665/gift7.jpg"><div class="mask"></div></td>
            <td><a href="#"></a></td>
            <td class="lottery-unit lottery-unit-3"><img src="http://demo.sc.chinaz.com//Files/DownLoad/webjs1/201611/jiaoben4665/gift3.jpg"><div class="mask"></div></td>
        </tr>
        <tr>
            <td class="lottery-unit lottery-unit-6"><img src="http://demo.sc.chinaz.com//Files/DownLoad/webjs1/201611/jiaoben4665/gift6.jpg"><div class="mask"></div></td>
            <td class="lottery-unit lottery-unit-5"><img src="http://demo.sc.chinaz.com//Files/DownLoad/webjs1/201611/jiaoben4665/gift5.jpg"><div class="mask"></div></td>
            <td class="lottery-unit lottery-unit-4"><img src="http://demo.sc.chinaz.com//Files/DownLoad/webjs1/201611/jiaoben4665/gift4.jpg"><div class="mask"></div></td>
        </tr>
    </table>
</div>

<script src="http://demo.sc.chinaz.com//Files/DownLoad/webjs1/201611/jiaoben4665/jquery-latest.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;
            };
        },
        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;
        },
    };

    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) {//转动基本次数时速度加快
                lottery.speed -= 10;
            }else{ //最后抽奖时速度减慢
                lottery.speed += 20;
            }
            if (lottery.speed<40) {
                lottery.speed=40;
            };
            lottery.timer = setTimeout(roll,lottery.speed);
        }
    }

    var click=false;

    window.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
                lottery.prize = 0;
                //   setTimeout(function(){
                //   	lottery.prize = 4;
                //   	clearTimeout(lottery.timer);
                // lottery.prize=-1;
                // lottery.times=0;
                // $(".lottery-unit").removeClass('active')
                // click=false;
                //   },6000)
            }
        });
    };
</script>

</div>
</body>
</html>
简单的抽奖

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