最近闲下来在做一些demo,现在讲一下做的一个简单的大转盘抽奖demo,前端lottery,layui,后端.net core,sqlsugar,数据库用的mysql

1.前端实现:

前端用的是基于开源的lottery,其中有些改动的,使得前端可以自适应pc端和手机端浏览器,以下是前端js调用实现:

var accountId = 1;
        var lottery = new LotteryDial(document.getElementById('luckPointer'),
            {   // eslint-disable-line
                speed: 30, // 每帧速度
                areaNumber: 8, // 奖区数量
                circleNumber: 5 //旋转圈数
            });
        var index = -1;
        var luckProduct = {};
        lottery.on('start',
            function() {
                // 请求获取中奖结果
                $.ajax({
                    url: '@Url.Action("GetLuckyResult")',
                    dataType: 'json',
                    type: 'post',
                    async :false,
                    data: { accountId: accountId, ran: Math.random() }
                }).done(function(d) {
                    if (d.code === 0) {
                        console.log('剩余次数为0');
                    }
                    if (d.code === 1) {
                        console.log(d.data);
                        index = parseInt(d.data.luckyIndex);
                        luckProduct = d.data;
                        lottery.setResult(index);
                    }
                });
                // 假如请求出错
                //    setTimeout(function () {
                //      lottery.reset()
                //    }, 1000)
            });
        lottery.on('end',
            function() {
                console.log('中奖奖区:' + index);
                if (luckProduct != null && luckProduct.isLucky) {
                    layer.msg('恭喜您中奖了,你将获得了:' + luckProduct.productName);
                } else {
                    layer.msg('谢谢参与!');
                }
                
            });

2.后端逻辑实现

后端用的简单算法,步骤如下

a.根据奖品概率构造一个区间

b.通过随机数Rondom的API获取随机值 [0, 最大值)

c.根据随机值匹配到对应区间的奖品,即是抽取到的奖品

代码实现如下:

public async Task<LuckyProduct> GetLuckyAction(int accountId)
        {
            var res = new LuckyProduct();
            try
            {
                var allow = Db.Queryable<LuckyAccount>().Where(e => e.AccountId == accountId).First();
                if (allow == null || allow.AllowCount <= 0)
                    return await Task.Run(() => res);
                bool isSaveAction = LuckyActionDb.Insert(new LuckyAction()
                {
                    AccountId = accountId,
                    LuckyAccount = "test",
                    CreatedAt = DateTime.Now
                });

                if (isSaveAction)
                {
                    allow.AllowCount = allow.AllowCount - 1;
                    bool isUpdateAllow =
                        LuckyAccountDb.Update(allow);
                    if (isUpdateAllow)
                    {
                        var list = LuckyProductDb.GetList(e => e.ProductStatus == 1 && e.ProductStore > 0);
                        if (list != null && list.Count > 0)
                        {
                            res = list.Find(e => e.IsLucky == 0);
                            Random r = new Random();
                            int index = r.Next(1, 100);
                            foreach (LuckyProduct t in list)
                            {
                                if (t.ProductLuckyRateMin <= index && t.ProductLuckyRateMax >= index)
                                {
                                    res = t;
                                }
                            }
                            if (res != null && res.IsLucky == 1)
                            {
                                res.ProductStore = res.ProductStore - 1;
                                LuckyProductDb.Update(res);
                                LuckyResultDb.Insert(new LuckyResult()
                                {
                                    AccountId = accountId,
                                    CreatedAt = DateTime.Now,
                                    LuckyAccount = "test",
                                    ProductCode = res.ProductCode,
                                    ProductId = res.ProductId,
                                    ProductName = res.ProductName
                                });
                            }
                        }
                    }
                }
            }
            catch (Exception ex)
            {
            }
            return await Task.Run(() => res);
        }

预览地址:http://lucky.idevtool.com/

开源demo地址:https://gitee.com/jomingol/lucky

程序员工具站点:草根工具www.idevtool.com  


原文链接:https://www.cnblogs.com/benpao/p/10824931.html