第三次作业 - 技术栈

使用js完成抽奖项目效果和内容自定义，可以模仿游戏抽奖页面

html 复制代码

<!DOCTYPE html>
<html lang="zh-CN">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>幸运大转盘抽奖</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            box-sizing: border-box;
        }
        
        body {
            font-family: 'Arial', sans-serif;
            background: linear-gradient(135deg, #1a2a6c, #b21f1f, #fdbb2d);
            min-height: 100vh;
            display: flex;
            flex-direction: column;
            align-items: center;
            justify-content: center;
            padding: 20px;
            color: #fff;
        }
        
        .container {
            max-width: 900px;
            width: 100%;
            background: rgba(255, 255, 255, 0.1);
            backdrop-filter: blur(10px);
            border-radius: 20px;
            box-shadow: 0 10px 30px rgba(0, 0, 0, 0.3);
            padding: 30px;
            text-align: center;
        }
        
        h1 {
            font-size: 2.8rem;
            margin-bottom: 20px;
            text-shadow: 0 2px 5px rgba(0, 0, 0, 0.3);
            color: #FFD700;
        }
        
        .subtitle {
            font-size: 1.2rem;
            margin-bottom: 40px;
            color: rgba(255, 255, 255, 0.9);
        }
        
        .wheel-container {
            position: relative;
            width: 400px;
            height: 400px;
            margin: 0 auto 40px;
        }
        
        #wheel {
            width: 100%;
            height: 100%;
            border-radius: 50%;
            position: relative;
            overflow: hidden;
            transition: transform 4s cubic-bezier(0.17, 0.67, 0.13, 0.99);
            box-shadow: 0 0 0 8px #e23232, 0 0 0 16px #f5d020;
            background: #fff;
        }
        
        .wheel-section {
            position: absolute;
            width: 50%;
            height: 50%;
            transform-origin: bottom right;
            left: 0;
            top: 0;
            display: flex;
            align-items: center;
            justify-content: center;
            padding-left: 60px;
            padding-bottom: 20px;
            font-weight: bold;
            color: #333;
            text-shadow: 0 1px 1px rgba(255, 255, 255, 0.5);
        }
        
        .wheel-section:nth-child(2n) {
            background: rgba(255, 255, 255, 0.8);
        }
        
        .wheel-section:nth-child(2n+1) {
            background: rgba(230, 230, 230, 0.8);
        }
        
        .pointer {
            position: absolute;
            top: -40px;
            left: 50%;
            transform: translateX(-50%);
            width: 30px;
            height: 80px;
            background: #ff3355;
            clip-path: polygon(0 0, 100% 0, 50% 100%, 50% 100%);
            z-index: 10;
            filter: drop-shadow(0 2px 3px rgba(0, 0, 0, 0.5));
        }
        
        .pointer:after {
            content: '';
            position: absolute;
            top: -8px;
            left: 50%;
            transform: translateX(-50%);
            width: 60px;
            height: 60px;
            background: #ffffff;
            border-radius: 50%;
            box-shadow: 0 3px 10px rgba(0, 0, 0, 0.2);
        }
        
        .button-container {
            margin: 20px 0 40px;
        }
        
        #spin-button {
            padding: 16px 50px;
            font-size: 1.4rem;
            background: linear-gradient(to right, #ff416c, #ff4b2b);
            color: white;
            border: none;
            border-radius: 50px;
            cursor: pointer;
            font-weight: bold;
            text-transform: uppercase;
            letter-spacing: 2px;
            box-shadow: 0 6px 15px rgba(255, 75, 43, 0.5);
            transition: all 0.3s ease;
        }
        
        #spin-button:hover {
            transform: translateY(-3px);
            box-shadow: 0 8px 20px rgba(255, 75, 43, 0.6);
        }
        
        #spin-button:disabled {
            background: #999;
            cursor: not-allowed;
            transform: none;
            box-shadow: none;
        }
        
        .prizes-container {
            background: rgba(0, 0, 0, 0.2);
            border-radius: 15px;
            padding: 20px;
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(140px, 1fr));
            gap: 15px;
            margin-bottom: 30px;
        }
        
        .prize-card {
            background: rgba(255, 255, 255, 0.15);
            border-radius: 12px;
            padding: 15px;
            transition: transform 0.3s ease;
        }
        
        .prize-card:hover {
            transform: translateY(-5px);
            background: rgba(255, 255, 255, 0.25);
        }
        
        .prize-card h3 {
            font-size: 1.3rem;
            margin-bottom: 8px;
            color: #FFD700;
        }
        
        #result {
            font-size: 1.5rem;
            min-height: 36px;
            margin: 20px 0;
            color: #FFD700;
            font-weight: bold;
            text-shadow: 0 1px 2px rgba(0, 0, 0, 0.3);
        }
        
        .confetti {
            position: absolute;
            width: 10px;
            height: 10px;
            background-color: #f00;
            animation: confetti-fall 5s ease-in-out;
            opacity: 0;
        }
        
        @keyframes confetti-fall {
            0% {
                transform: translateY(-100px) rotate(0deg);
                opacity: 1;
            }
            100% {
                transform: translateY(100vh) rotate(720deg);
                opacity: 0;
            }
        }
        
        @media (max-width: 700px) {
            .wheel-container {
                width: 420px;
                height: 300px;
            }
            
            .wheel-section {
                padding-left: 45px;
                padding-bottom: 10px;
                font-size: 0.9rem;
            }
            
            h1 {
                font-size: 2.2rem;
            }
            
            .prizes-container {
                grid-template-columns: repeat(auto-fill, minmax(120px, 1fr));
            }
        }
    </style>
</head>
<body>
    <div class="container">
        <h1>幸运大转盘</h1>
        <div class="subtitle">转动转盘，赢取超值大奖！每天可抽奖3次</div>
        
        <div class="wheel-container">
            <div class="pointer"></div>
            <div id="wheel">
                <!-- 转盘区域会通过JS动态生成 -->
            </div>
        </div>
        
        <div class="button-container">
            <p id="result">转盘已就绪，点击开始抽奖！</p>
            <button id="spin-button">开始抽奖</button>
        </div>
        
        <div class="prizes-container">
            <div class="prize-card">
                <h3>特等奖</h3>
                <p>iPhone 15 Pro</p>
            </div>
            <div class="prize-card">
                <h3>一等奖</h3>
                <p>任天堂 Switch</p>
            </div>
            <div class="prize-card">
                <h3>二等奖</h3>
                <p>AirPods Pro</p>
            </div>
            <div class="prize-card">
                <h3>三等奖</h3>
                <p>200元现金</p>
            </div>
            <div class="prize-card">
                <h3>幸运奖</h3>
                <p>50元优惠券</p>
            </div>
        </div>
    </div>

    <script src="script.js"></script>
</body>
</html>

javascript 复制代码

// script.js
document.addEventListener('DOMContentLoaded', () => {
    // 奖项配置：奖项名称、背景色、权重（权重值越大抽中几率越小）
    const prizes = [
        { name: "谢谢参与", color: "#f8f9fa", weight: 4 },
        { name: "50元优惠券", color: "#ffdd33", weight: 3 },
        { name: "100元现金", color: "#4caf50", weight: 2 },
        { name: "AirPods Pro", color: "#03a9f4", weight: 2 },
        { name: "任天堂 Switch", color: "#9c27b0", weight: 1 },
        { name: "iPhone 15 Pro", color: "#ff5722", weight: 1 },
        { name: "300元现金", color: "#ff9800", weight: 2 },
        { name: "200元现金", color: "#8bc34a", weight: 2 }
    ];
    
    const wheel = document.getElementById('wheel');
    const spinButton = document.getElementById('spin-button');
    const resultEl = document.getElementById('result');
    let canSpin = true;
    let attempts = 3; // 初始抽奖次数
    
    // 初始化转盘
    function initWheel() {
        wheel.innerHTML = '';
        const sliceAngle = 360 / prizes.length;
        
        prizes.forEach((prize, i) => {
            const section = document.createElement('div');
            section.className = 'wheel-section';
            section.textContent = prize.name;
            section.style.backgroundColor = prize.color;
            section.style.transform = `rotate(${i * sliceAngle}deg)`;
            wheel.appendChild(section);
        });
    }
    
    // 随机选择奖项（带权重系统）
    function getRandomPrize() {
        // 计算总权重
        const totalWeight = prizes.reduce((sum, prize) => sum + prize.weight, 0);
        
        // 生成随机数
        const randomNum = Math.random() * totalWeight;
        
        // 确定奖项
        let weightSum = 0;
        for (const prize of prizes) {
            weightSum += prize.weight;
            if (randomNum <= weightSum) {
                return prize;
            }
        }
        
        return prizes[0]; // 默认值
    }
    
    // 创建彩色纸屑特效
    function createConfetti() {
        const colors = ['#f44336', '#e91e63', '#9c27b0', '#673ab7', '#3f51b5', '#2196f3', '#03a9f4', '#00bcd4', '#009688', '#4CAF50', '#8BC34A', '#CDDC39', '#FFEB3B', '#FFC107', '#FF9800', '#FF5722'];
        
        for (let i = 0; i < 150; i++) {
            const confetti = document.createElement('div');
            confetti.className = 'confetti';
            confetti.style.backgroundColor = colors[Math.floor(Math.random() * colors.length)];
            confetti.style.left = `${Math.random() * 100}%`;
            confetti.style.animationDuration = `${Math.random() * 3 + 2}s`;
            confetti.style.width = `${Math.random() * 10 + 5}px`;
            confetti.style.height = `${Math.random() * 10 + 5}px`;
            document.body.appendChild(confetti);
            
            // 结束后清理
            setTimeout(() => {
                confetti.remove();
            }, 5000);
        }
    }
    
    // 旋转转盘
    function spinWheel() {
        if (!canSpin) return;
        
        canSpin = false;
        spinButton.disabled = true;
        resultEl.textContent = "转盘旋转中...";
        
        // 获取随机奖项
        const prize = getRandomPrize();
        
        // 每次旋转至少5圈（1800度）再加奖项位置
        const sliceAngle = 360 / prizes.length;
        const prizeIndex = prizes.findIndex(p => p.name === prize.name);
        const rotation = 1800 + (prizeIndex * sliceAngle);
        
        // 设置转盘旋转
        wheel.style.transform = `rotate(${rotation}deg)`;
        
        // 显示结果
        setTimeout(() => {
            attempts--;
            spinButton.textContent = `开始抽奖 (${attempts}次机会)`;
            resultEl.innerHTML = `恭喜您获得: <strong style="color:#ffdd00; font-size:1.6rem;">${prize.name}</strong>`;
            createConfetti();
            
            // 恢复按钮状态（如果还有机会）
            if (attempts > 0) {
                spinButton.disabled = false;
                canSpin = true;
            } else {
                resultEl.innerHTML += "<br>今日抽奖机会已用完，明天再来吧！";
            }
        }, 4000);
    }
    
    // 事件监听
    spinButton.addEventListener('click', spinWheel);
    
    // 初始化
    initWheel();
    spinButton.textContent = `开始抽奖 (${attempts}次机会)`;
});