html5实现九宫格抽奖可固定抽中某项奖品

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原生js写的一个九宫格抽奖程序（周末在家闲着也是闲着）
我写的这个抽奖是拿来整蛊我女朋友，因为每次抽奖的结果都是同一个。。
哈哈哈哈哈哈哈哈哈哈哈哈哈
我会附上正常抽奖的的代码和固定只能抽到某一个的代码；

HTML代码如下 ⤵️

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>抽奖</title>
    <style>
        * {
            padding: 0;
            margin: 0;
            box-sizing: border-box;
        }

        html,
        body,
        .modal-cover {
            width: 100%;
            height: 100%;
        }

        body {
            background: url('./img/background.jpg') no-repeat center;
            background-size: 100% 100%;
            overflow: hidden;
        }

        .container {
            width: 90%;
            height: 300px;
            /* width: 831px; */
            height: 336px;
            /* border: 1px solid; */
            display: flex;
            flex-wrap: wrap;
            margin: 100px auto;
            border-radius: 6px;
            background: #fff;
            padding: 5px 0 5px 10px;
        }

        .item {
            width: 30%;
            height: 30%;
            /* outline: 1px solid black; */
            display: flex;
            justify-content: center;
            align-items: center;
            font-size: 18;
            border-radius: 2px;
            /* border: 1px solid; */
            margin: 4px;
            box-shadow: 1px 1px 14px #ccc;
            position: relative;
        }

        .cover {
            position: absolute;
            width: 100%;
            height: 100%;
            background: rgba(0, 0, 0, 0.3);
            top: 0;
            left: 0;
            border-radius: 2px;
        }

        .item-box {
            width: 100%;
            height: 100%;
            background-size: 100% 100%;
            background-repeat: no-repeat;
        }

        .btn-box {
            background-color: #faa5b6;
            cursor: pointer;
            color: #fff;
            font-size: 14px;
            text-align: center;
            line-height: 100px;
        }

        .modal {
            width: 80%;
            height: 150px;
            position: fixed;
            top: 50%;
            left: 50%;
            background: rgba(255, 255, 255, 255);
            border-radius: 4px;
            transform: translate(-50%, -50%);
            text-align: center;
            padding: 20px 10px 10px;
            z-index: 2;
        }

        .modal .confirm-btn {
            background: pink;
            width: 170px;
            height: 40px;
            color: #fff;
            text-align: center;
            line-height: 40px;
            margin: 0 auto;
            margin-top: 20px;
            cursor: pointer;
            border-radius: 4px;
        }

        .modal-cover {
            position: fixed;
            top: 0;
            left: 0;
            background: rgba(0, 0, 0, 0.3);
            z-index: 1;
            display: none;
        }
    </style>

</head>

<body>
    <div class="container">
        <div class="item">
            <div class="cover"></div>
            <div class="item-box"></div>
        </div>
        <div class="item">
            <div class="cover"></div>
            <div class="item-box"></div>
        </div>
        <div class="item">
            <div class="cover"></div>
            <div class="item-box"></div>
        </div>
        <div class="item">
            <div class="cover"></div>
            <div class="item-box"></div>
        </div>
        <div class="btn-box item">
            <div class="cover" style="background: none;"></div>
            <div class="item-box">
                开始抽奖
            </div>
        </div>
        <div class="item">
            <div class="cover"></div>
            <div class="item-box"></div>
        </div>
        <div class="item">
            <div class="cover"></div>
            <div class="item-box"></div>
        </div>
        <div class="item">
            <div class="cover"></div>
            <div class="item-box"></div>
        </div>
        <div class="item">
            <div class="cover"></div>
            <div class="item-box"></div>
        </div>
    </div>
    <div class="modal-cover"></div>
    <div class="modal" style="display: none;">
        <span></span>
        <div class="confirm-btn">不信邪！再试一次！</div>
    </div>
</body>
<script src="./index.js"></script>

</html>

js代码👇

// 封装工具函数
const util = {
    getELe: (str) => {
        return document.querySelector(str)
    },
    getELes: (str) => {
        return document.querySelectorAll(str)
    }
}
let items = util.getELes(".item-box"),
    covers = util.getELes('.cover'),
    imgArr = ['CHANEL', 'Dior', 'givenchy', 'dabao', 'empty', 'lamer', 'lancome', 'yashilandai', 'YSL', ]

for (let i = 0; i < items.length; i++) {
    if (imgArr[i] === 'empty') continue;
    let el = items[i];
    el.style.backgroundImage = `url(./img/${imgArr[i]}.png)`
}
let modal = util.getELe('.modal'),
    mask = util.getELe('.modal-cover'),
    modalInner = util.getELe('.modal span');
let tryBtn = util.getELe('.confirm-btn');
// 存放每一个奖项的下标
let arr = [0, 1, 2, 5, 8, 7, 6, 3],
    i = 0,
    count = 0,
    stopTimer;
let rand = Math.floor(Math.random() * 8 + 50);
const rotate = () => {
    // 先给所有的奖项盒子加蒙层
    for (let j = 0; j < arr.length; j++) {
        covers[arr[j]].style.background = 'rgba(0, 0, 0, 0.3)';
    }
    // 将当前奖项的遮罩层去除
    covers[arr[i]].style.background = 'none';
    i++;
    if (i === arr.length) {
        i = 0;
    }
     // 通过count调整旋转速度
    count++;
    // 根据count 重新调整计时器速度
    if (count === 5 || count === 45) {
        clearInterval(stopTimer);
        stopTimer = setInterval(rotate, 200);
    }
    if (count === 10 || count === 35) {
        clearInterval(stopTimer);
        stopTimer = setInterval(rotate, 100);
    }
    if (count === 15) {
        clearInterval(stopTimer);
        stopTimer = setInterval(rotate, 50);
    }
    // 固定抽中某个奖项
    // if (count === 40) {
    //     clearInterval(stopTimer);
    //     count = 0;
    //     rand = 0;
    //     setTimeout(() => {
    //         modalInner.innerText = '亲！恭喜你中奖大宝SOD蜜一瓶！^_^ 😄';
    //         modal.style.display = 'block'
    //         mask.style.display = 'block'
    //     }, 500);
    // }

    // 当等于上面的随机数时
    if (count === rand) {
        clearInterval(stopTimer);
    }
    // 点击再试一次
    tryBtn.addEventListener('click', () => {
        modal.style.display = 'none'
        mask.style.display = 'none'
    })


}
// 给开始按钮绑定点击事件 点击后执行 rotate 
const start = () => {
    console.log(count)
    clearInterval(stopTimer);
    stopTimer = setInterval(rotate, 300);
}
covers[4].addEventListener("click", start);

如果想设置固定抽中某个奖项，// if (count === 40) 这个count的值需要你自己去算一下，图片自己选几个。
代码copy可直接运行。
最终效果，有点丑。你们想玩的自己发挥下吧。