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题三：随机点名
要求： 分为上下两个部分，上方为显示区域，下方为控制区域。显示区域显示五十位群成员的学号和姓名，控制区域由开始和结束两个按钮 组成。点击开始按钮，显示区域里的内容开始滚动，点击结束按钮，内容滚动停止，随机显示一位成员的学号和姓名。
html 部分
<body><div class="display"><ul class="list"></ul></div><div class="anliu"><button class="start">开始</button><button class="stop">结束</button></div>css部分
<style>body {margin: 0;padding: 0;display: flex;flex-direction: column;height: 100vh;}.display {flex: 1;overflow: hidden;background-color: #f0f0f0;padding: 20px;box-sizing: border-box;position: relative;}@keyframes scroll {0% {top: 0;}100% {top: -100%;}}.list {list-style: none;margin: 0;padding: 0;position: absolute;top: 0;width: 100%;}.list li {padding: 10px;font-size: 18px;border-bottom: 1px solid #ccc;}.anliu {display: flex;justify-content: center;gap: 20px;padding: 20px;background-color: #ddd;}button {padding: 10px 20px;font-size: 16px;cursor: pointer;/*变成小手*/border: none;background-color: green;color: white;border-radius: 5px;}button:hover {background-color: red;}</style>js部分
<script>document.addEventListener('DOMContentLoaded', function () {const list = document.querySelector('.list');const start = document.querySelector('.start');const stop = document.querySelector('.stop');const yb = [{ id: '23120901', name: '姜怡雯' },{ id: '23210204', name: '付煜舒' },{ id: '23210210', name: '岳含旭' },{ id: '23210310', name: '赵可' },{ id: '23210406', name: '施紫涵' },{ id: '23210408', name: '郑欣妍' },{ id: '23210605', name: '李晶靓' },{ id: '23210606', name: '马诗雨' },{ id: '23210610', name: '杨嘉润' },{ id: '23220125', name: '薛睿' },{ id: '23220204', name: '陆萧彦' },{ id: '23220418', name: '李华勇' },{ id: '23220422', name: '王翰铭' },{ id: '23220426', name: '徐新洪' },{ id: '23220506', name: '张盼' },{ id: '23220607', name: '张婉玉' },{ id: '23220623', name: '王学潮' },{ id: '23220705', name: '石一汝' },{ id: '23220714', name: '高俊宇' },{ id: '23230101', name: '陈思静' },{ id: '23230102', name: '高紫怡' },{ id: '23230103', name: '李嘉慧' },{ id: '23230104', name: '李思怡' },{ id: '23230205', name: '唐艺文' },{ id: '23240101', name: '季雅雯' },{ id: '23240207', name: '吕倩雨' },{ id: '23240301', name: '周婉愉' },{ id: '23240412', name: '郑伯熙' },{ id: '23240426', name: '孙致远' },{ id: '23250316', name: '顾成志' },{ id: '23250411', name: '朱逸倩' },{ id: '23320515', name: '崔齐鑫' },{ id: '24110319', name: '范熠阳' },{ id: '24121002', name: '钱姝澄' },{ id: '24121309', name: '向文杰' },{ id: '24210110', name: '任焯琳' },{ id: '24210119', name: '卜家文' },{ id: '24210214', name: '许成晨' },{ id: '24210319', name: '钱岩' },{ id: '24210414', name: '刘志豪' },{ id: '24210512', name: '郑鸿强' },{ id: '24210609', name: '倪张睿' },{ id: '24210702', name: '冯雅琳' },{ id: '24210704', name: '李晓熙' },{ id: '24210716', name: '魏冕' },{ id: '242108111', name: '盛健翔' },{ id: '24210822', name: '周锦浩' }];function showMembers() {let htmlContent = '';for (let i = 0; i < yb.length; i++) {const currentYb = yb[i];htmlContent += `<li>学号：${currentYb.id},姓名：${currentYb.name}</li>`;}list.innerHTML = htmlContent;}function startScroll() {list.style.animation = 'scroll 1s linear infinite'; }function stopScroll() {list.style.animation = 'none';const randomIndex = Math.floor(Math.random() * yb.length);const randomYb = yb[randomIndex];list.innerHTML = `<li>学号：${randomYb.id}，姓名：${randomYb.name}</li>`;}start.addEventListener('click', startScroll);stop.addEventListener('click', stopScroll);showMembers();});</script>视频：
js第三题