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JS实现简易转盘抽奖

2026-01-31 02:04:16JavaScript

JS实现简易转盘抽奖

实现思路

使用HTML+CSS构建转盘界面，通过JavaScript控制旋转动画和抽奖逻辑。核心是随机生成旋转角度，结合CSS过渡效果实现平滑停止。

HTML结构

<div class="wheel-container">
  <div class="wheel"></div>
  <button class="spin-btn">开始抽奖</button>
  <div class="pointer"></div>
</div>

CSS样式

.wheel-container {
  position: relative;
  width: 300px;
  height: 300px;
  margin: 0 auto;
}

.wheel {
  width: 100%;
  height: 100%;
  border-radius: 50%;
  background: conic-gradient(
    red 0deg 60deg,
    blue 60deg 120deg,
    green 120deg 180deg,
    yellow 180deg 240deg,
    purple 240deg 300deg,
    orange 300deg 360deg
  );
  transition: transform 4s cubic-bezier(0.17, 0.67, 0.21, 0.99);
}

.pointer {
  position: absolute;
  top: -20px;
  left: 50%;
  transform: translateX(-50%);
  width: 0;
  height: 0;
  border-left: 15px solid transparent;
  border-right: 15px solid transparent;
  border-top: 30px solid black;
}

.spin-btn {
  display: block;
  margin: 20px auto;
  padding: 10px 20px;
  background: #4CAF50;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

JavaScript逻辑

const wheel = document.querySelector('.wheel');
const spinBtn = document.querySelector('.spin-btn');
let isSpinning = false;

spinBtn.addEventListener('click', () => {
  if (isSpinning) return;

  isSpinning = true;
  const segments = 6; // 转盘分段数
  const minSpin = 3; // 最小旋转圈数
  const maxSpin = 8; // 最大旋转圈数

  // 随机生成旋转角度（完整圈数+随机停止位置）
  const spinDegrees = Math.floor(Math.random() * (maxSpin - minSpin + 1) + minSpin) * 360;
  const finalAngle = spinDegrees + (360 - (spinDegrees % 360) / segments * segments);

  wheel.style.transform = `rotate(${-finalAngle}deg)`;

  setTimeout(() => {
    isSpinning = false;
    const winningSegment = Math.floor((finalAngle % 360) / (360 / segments));
    alert(`恭喜获得: ${['一等奖', '二等奖', '三等奖', '四等奖', '五等奖', '六等奖'][winningSegment]}`);
  }, 4000);
});