PHP + AJAX实现幸运转盘抽奖

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后端index.PHP文件：

[php]
<?php

/**
*
* php + ajax 幸运大转盘
* @author Sim <326196998@qq.com>
* @time 2014年9月25日15:37:32
* @url http://www.yiifcms.com/post/59/
*
*/
//奖项初始化
$prize_arr = array(
'0' => array('id'=>1,'min'=>1,'max'=>29,'prize'=>'一等奖','v'=>1),
'1' => array('id'=>2,'min'=>302,'max'=>328,'prize'=>'二等奖','v'=>2),
'2' => array('id'=>3,'min'=>242,'max'=>268,'prize'=>'三等奖','v'=>5),
'3' => array('id'=>4,'min'=>182,'max'=>208,'prize'=>'四等奖','v'=>7),
'4' => array('id'=>5,'min'=>122,'max'=>148,'prize'=>'五等奖','v'=>10),
'5' => array('id'=>6,'min'=>62,'max'=>88,'prize'=>'六等奖','v'=>25),
'6' => array('id'=>7,'min'=>array(32,92,152,212,272,332),
'max'=>array(58,118,178,238,298,358),'prize'=>'七等奖','v'=>50)
);
//抽奖开始
foreach ($prize_arr as $key => $val) {
$arr[$val['id']] = $val['v'];
}
$rid = getRand($arr); //根据概率获取奖项id
$res = $prize_arr[$rid-1]; //中奖项
$min = $res['min'];
$max = $res['max'];
if($res['id']==7){ //七等奖
$i = mt_rand(0,5);
$result['angle'] = mt_rand($min[$i],$max[$i]);
}else{
$result['angle'] = mt_rand($min,$max); //随机生成一个角度
}
$result['prize'] = $res['prize'];
echo json_encode($result);
/**
* 根据概率获取奖项
* @param unknown $proArr
* @return Ambigous <string, unknown>
*/
function getRand($proArr) {
$result = '';
//概率数组的总概率精度
$proSum = array_sum($proArr);
//概率数组循环
foreach ($proArr as $key => $proCur) {
$randNum = mt_rand(1, $proSum);
if ($randNum <= $proCur) {
$result = $key;
break;
} else {
$proSum -= $proCur;
}
}
unset ($proArr);
return $result;
}

前端index.html文件：

[html] view plain copy print?

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>幸运大转盘 - PHP+AJAX实现</title>
<style type="text/css">
.demo { height: 417px; margin: 50px auto; position: relative; width: 417px;}
#disk { background: url("disk.jpg") no-repeat; height: 417px; width: 417px;}
#start { height: 320px; left: 130px; position: absolute; top: 46px; width: 163px;}
</style>
<script type="text/javascript" src="jquery-1.8.3.js"></script>
<script type="text/javascript" src="jQueryRotate.2.2.js"></script>
<script type="text/javascript">
$(function(){
$("#startbtn").click(function(){
lottery();
});
});
function lottery(){
$.ajax({
type: 'POST',
url: 'index.php',
dataType: 'json',
cache: false,
error: function(){
alert('出错了！');
return false;
},
success:function(json){
$("#startbtn").unbind('click').css("cursor","default");
var a = json.angle; //角度
var p = json.prize; //奖项
$("#startbtn").rotate({
duration:3000, //转动时间
angle: 0,
animateTo:1800+a, //转动角度
easing: $.easing.easeOutSine,
callback: function(){
var con = confirm('恭喜你，中得'+p+'\n还要再来一次吗？');
if(con){
lottery();
}else{
//再次绑定click事件
$("#startbtn").css("cursor","pointer").live("click",function(){
lottery();
});
return false;
}
}
});
}
});
}
</script>
</head>
<body>
<div class="demo">
<div id="disk"></div>
<div id="start"><img id="startbtn" src="start.png" style="cursor: pointer; transform: rotate(0deg);"></div>
</div>
</body>
</html>

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