js九宫格中奖概率写法

// 奖品列表
const prizes = [
  { name: '一等奖', probability: 0.1 },
  { name: '二等奖', probability: 0.2 },
  { name: '三等奖', probability: 0.3 },
  { name: '谢谢参与', probability: 0.4 }
];

// 计算总概率
const totalProbability = prizes.reduce((sum, prize) => sum + prize.probability, 0);

// 抽奖函数
function drawPrize() {
  let randomValue = Math.random() * totalProbability;
  for (let prize of prizes) {
    if (randomValue < prize.probability) {
      return prize.name;
    }
    randomValue -= prize.probability;
  }
  return '谢谢参与'; // 默认返回
}

// 模拟抽奖按钮点击事件
document.getElementById('drawButton').addEventListener('click', () => {
  const result = drawPrize();
  alert(`恭喜您获得：${result}`);
});