jQuery+Ajax九宫格抽奖转盘 [ 技术分享 ]

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。

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>

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);

抽奖转盘演示：http://www.sucaihuo.com/js/129.html