PHP+jQuery+Ajax九宫格抽奖转盘

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分享一款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，并且后台ajax.php可设置奖品和中奖概率。

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HTML

首先我们在#lottery放置12个奖品，代码如下：

<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>

奖品基本设置：

var lottery = {
        index: 0, //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: 0, //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;
        }
};

jQuery

点击“开始抽奖”按钮，并且远程ajax.php获取奖项：

$(function() {
    lottery.init('lottery');
    $("#lottery a").click(function() {
        if (click) {
            return false;
        } else {
            lottery.speed = 100;
            $.post("ajax.php", {
                uid: 1
            },
            function(data) { //获取奖品，也可以在这里判断是否登陆状态
                $("#lottery").attr("prize_site", data.prize_site);
                $("#lottery").attr("prize_id", data.prize_id);
                $("#lottery").attr("prize_name", data.prize_name);
                roll();
                click = true;
                return false;
            },
            "json")
        }
    });
})

Ajax.php

12个奖品数组如下，其中prize表示奖项内容，v表示中奖几率(若数组中七个奖项的v的总和为100，如果v的值为1，则代表中奖几率为1%，依此类推)

$prize_arr = array(
    '0' => array('id' => 1, 'prize' => '一等奖', 'v' => 5),
    '1' => array('id' => 2, 'prize' => '二等奖', 'v' => 5),
    '2' => array('id' => 3, 'prize' => '三等奖', 'v' => 5),
    '3' => array('id' => 4, 'prize' => '四等奖', 'v' => 5),
    '4' => array('id' => 5, 'prize' => '五等奖', 'v' => 5),
    '5' => array('id' => 6, 'prize' => '六等奖', 'v' => 5),
    '6' => array('id' => 7, 'prize' => '七等奖', 'v' => 5),
    '7' => array('id' => 8, 'prize' => '八等奖', 'v' => 5),
    '8' => array('id' => 9, 'prize' => '九等奖', 'v' => 5),
    '9' => array('id' => 10, 'prize' => '十等奖', 'v' => 5),
    '10' => array('id' => 11, 'prize' => '十一等奖', 'v' => 25),
    '11' => array('id' => 12, 'prize' => '十二等奖', 'v' => 25),
);

获取随机奖品：

foreach ($prize_arr as $k=>$v) {
    $arr[$v['id']] = $v['v'];

}

$prize_id = getRand($arr); //根据概率获取奖项id 
foreach($prize_arr as $k=>$v){ //获取前端奖项位置
    if($v['id'] == $prize_id){
     $prize_site = $k;
     break;
    }
}
$res = $prize_arr[$prize_id - 1]; //中奖项 

$data['prize_name'] = $res['prize'];
$data['prize_site'] = $prize_site;//前端奖项从-1开始
echo json_encode($data);