效果图
代码
<!DOCTYPE html>
<html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><title>练习：随机抽奖案例</title><style>* {box-sizing: border-box;}div {margin: 100px auto;padding: 100px 270px;width: 800px;height: 400px;background: url(images/bg01.jpg) no-repeat left/contain;}</style>
</head><body><div><h1>一等奖：<Strong></Strong></h1><h2>二等奖：<strong></strong></h2><h3>三等奖：<strong></strong></h3></div><script>const arr = ['张三', '李四', '王五', '赵六', '冯七']for (let i = 0; i < 3; i++) {let num = Math.floor(Math.random() * arr.length)let stron = document.querySelectorAll("div strong")[i]stron.innerHTML = arr[num]arr.splice(num, 1)}</script>
</body></html>
![[机器学习]--线性回归算法](https://i-blog.csdnimg.cn/direct/38189eeaa18b44b282fedae6a3463eea.png)
