C# MVC模式下商品抽奖功能实现

 function rotate() { $.ajax({ type: 'POST', url: '/控制器/方法', dataType: 'json', cache: false, error: function () { alert('出错了！'); return false; }, success: function (data) { if (data == 1 || data == -3) { var bRotate = true; if (data == 1) { alert("请登录!"); }if (data == -3) { alert("对不起，您的奖券不足!") } } else { var angles = parseInt(data.angle); //角度 var txt = data.prize; //奖项 var awards = parseInt(data.id); var bRotate = false; //如果bRotate为 true 的时候无法点击 var rotateFn = rotateFn_method(awards, angles, txt); if (bRotate) return; switch (awards) { case 0: //var angle = [26, 88, 137, 185, 235, 287, 337]; 　　　　　　　　　　　　　　　　// rptateFn_method 三个参数均为后台传出，0,337  为转盘旋转所对应的角度，最后一个则为商品名称 rotateFn_method(0, 337, '奖品名称'); break; case 1: //var angle = [88, 137, 185, 235, 287]; rotateFn_method(1, 26, '奖品名称'); break; case 2: //var angle = [137, 185, 235, 287]; rotateFn_method(2, 88, '奖品名称'); break; case 3: //var angle = [137, 185, 235, 287]; rotateFn_method(3, 137, '奖品名称'); break; case 4: //var angle = [185, 235, 287]; rotateFn_method(4, 185, '奖品名称'); break; case 5: //var angle = [185, 235, 287]; rotateFn_method(5, 235, '奖品名称'); break; case 6: //var angle = [235, 287]; rotateFn_method(6, 235, '奖品名称'); break; case 7: //var angle = [287]; rotateFn_method(7, 282, '奖品名称'); break; } } } }); } 　　//旋转事件 function rotateFn_method(awards, angles, txt) { var bRotate = false; bRotate = !bRotate; $('#turntable').stopRotate(); $('#turntable').rotate({ angle: 0, animateTo: angles + 1800, duration: 8000, callback: function () { $("#Pl h4").html("恭喜你抽中" + txt + ""); } bRotate = !bRotate; } }) }; //刷新当前页面 function locateEnd() { window.location.reload(); } 

 //判断用户是否登录 if (admin != null) { 　　　　　　　　　//获取后台设置的数据，见图1 var LdList = hr.LuckdrawList(); 　　　　　　　　　//因为涉及到公司的项目所有一些敏感地方均已中文代替 List dt = LdList.Select(i => i.概率).ToList(); 　　　　　　　　　//创建一个数值 double[] Array = dt.ToArray(); //角度 int angle = 0; //奖品 var prize = ""; var id = 0; 　　　　　　　　　//将概率放入数值，调用下面的Get方法计算出所返回的概率位于数值中的第几位 var Pl = Get(Array); 　　　　　　　　　//获取奖品表中位于Pl的产品 var model = LdList[Pl]; 　　　　　　　　　　　// id , angle 角度  prize 奖品 if (model.奖品等级 == 1) { angle = 26; prize = model.奖品; id = 1; } if (model.奖品等级 == 7) { angle = 88; prize = model.奖品; id = 2; } if (model.奖品等级 == 4) { angle = 137; prize = model.奖品; id = 3; } if (model.奖品等级 == 3) { angle = 185; prize = model.奖品; id = 4; } if (model.奖品等级 == 6) { angle = 235; prize = model.奖品; id = 5; } if (model.奖品等级 == 2) { angle = 282; prize = model.奖品; id = 7; } if (model.奖品等级 == 5) { angle = 337; prize = model.奖品; id = 0; } return Json(new { angle = angle, prize = prize, id = id }); }return Json(data); } 

 /// 
 /// 获取抽奖结果 /// 
 /// 各物品的抽中概率 /// 返回抽中的物品所在数组的位置 private static int Get(double[] prob) { int result = 0; int n = (int)(prob.Sum() * 1000);      //计算概率总和，放大1000倍 Random r = rnd; float x = (float)r.Next(0, n) / 1000;    //随机生成0~概率总和的数字 for (int i = 0; i = pre && x