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JS经典轮播图和选项卡
#三生
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1. 选项卡

示例代码：
  1. <!DOCTYPE html>
  2. <html lang="zh-CN">
  4. <head>
  5.     <meta charset="UTF-8" />
  6.     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  7.     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  8.     <title>选项卡</title>
  9.     <style>
  10.         .box {
  11.             width: 100vw;
  12.         }
  14.         .box ul {
  15.             margin: 0;
  16.             padding: 0;
  17.         }
  19.         .box .menu li {
  20.             display: inline-block;
  21.         }
  23.         .box .menu li:hover {
  24.             cursor: pointer;
  25.         }
  27.         .box .menu li.active {
  28.             background-color: lightgreen;
  29.         }
  31.         .box .content {
  32.             background-color: lightgreen;
  33.             text-align: center;
  34.             height: 120px;
  35.             width: 100vw;
  36.             display: none;
  37.         }
  39.         .box .content.active {
  40.             display: inline-block;
  41.         }
  42.     </style>
  43. </head>
  45. <body>
  46.     <div class="box">
  47.         <!-- 1. 标签 -->
  48.         <ul class="menu" onclick="show()">
  49.             <li data-index="1" class="active">内容1</li>
  50.             <li data-index="2">内容2</li>
  51.             <li data-index="3">内容3</li>
  52.             <li data-index="4">内容4</li>
  53.         </ul>
  55.         <!-- 2. 内容 -->
  56.         <div class="container">
  57.             <section class="content active" data-index="1">内容1</section>
  58.             <section class="content" data-index="2">内容2</section>
  59.             <section class="content" data-index="3">内容3</section>
  60.             <section class="content" data-index="4">内容4</section>
  61.         </div>
  62.     </div>
  63.     <script>
  64.         function show() {
  65.             // 事件绑定
  66.             const ul = event.currentTarget;
  68.             // 事件触发者
  69.             const li = event.target;
  71.             // 1. 将原高亮的标签去掉高亮样式,并把当前点击的标签设置为高亮
  72.             [...ul.children].forEach(li => li.classList.remove("active"));
  73.             li.classList.add("active");
  75.             // 2. 根据标签的自定义索引属性来确定应该显示哪个列表
  76.             // const uls = document.querySelectorAll(".content");
  77.             document.querySelectorAll(".content").forEach(li => li.classList.remove("active"));
  79.             // data-index === 左面的标签的data-index
  80.             // const content = [...uls].find(ul => ul.dataset.index === li.dataset.index);
  81.             [...document.querySelectorAll(".content")]
  82.             .find(ul => ul.dataset.index === li.dataset.index)
  83.                 .classList.add("active");
  84.             // content.classList.add("active");
  85.         }
  86.     </script>
  87. </body>
  89. </html>
示例图：

2. 经典轮播图案例

示例代码：
  1. <!DOCTYPE html>
  2. <html lang="zh-CN">
  4. <head>
  5.     <meta charset="UTF-8" />
  6.     <meta http-equiv="X-UA-Compatible" content="IE=edge" />
  7.     <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  8.     <title>轮播图</title>
  9.     <style>
  10.         .slider {
  11.             max-width: 750px;
  12.             min-width: 320px;
  13.             margin: auto;
  14.             padding: 0 10px;
  15.         }
  17.         .slider .imgs {
  18.             /* 图片容器必须要有高度,否则下面图片不能正常显示 */
  19.             height: 150px;
  20.         }
  22.         .slider .imgs img {
  23.             /* 图片完全充满父级空间显示 */
  24.             height: 100%;
  25.             width: 100%;
  26.             /* 图片带有圆角 */
  27.             border-radius: 10px;
  28.             /* 默认图片全部隐藏,只有有active的图片才显示 */
  29.             display: none;
  30.         }
  31.         /* 默认显示第一张 */
  33.         .slider .imgs img.active {
  34.             display: block;
  35.         }
  36.         /* 轮播图按钮组 */
  38.         .slider .btns {
  39.             /* 按钮水平一排显示,用flex,且水平居中 */
  40.             display: flex;
  41.             place-content: center;
  42.         }
  44.         .slider .btns span {
  45.             /* 按钮宽高相同,确定显示成一个正圆 */
  46.             width: 8px;
  47.             height: 8px;
  48.             /* 加上红色背景和数字是为了布局时可以看到,一会更去掉 */
  49.             background-color: rgba(255, 255, 255, 0.4);
  50.             /* 50%可确保显示为正圆 */
  51.             border-radius: 50%;
  52.             /* 按钮上外边距负值,可将它上移,可移动到图片中下方 */
  53.             margin: -12px 3px 5px;
  54.         }
  56.         .slider .btns span.active {
  57.             background-color: #fff;
  58.         }
  59.     </style>
  60. </head>
  62. <body>
  63.     <div class="slider">
  64.         <!-- 图片容器 -->
  65.         <div class="imgs">
  66.             <!-- 轮播图默认从第一张开始显示 -->
  67.             <a href=""><img src="./images/banner1.jpg" alt="" data-index="1" class="active" /></a>
  68.             <a href=""><img src="./images/banner2.jpg" alt="" data-index="2" /></a>
  69.             <a href=""><img src="./images/banner3.png" alt="" data-index="3" /></a>
  70.         </div>
  71.         <!-- 切换按钮数量与图片数量必须一致 -->
  72.         <div class="btns">
  73.             <span data-index="1" class="active" onclick="setActive()"></span>
  74.             <span data-index="2" onclick="setActive()"></span>
  75.             <span data-index="3" onclick="setActive()"></span>
  76.         </div>
  77.     </div>
  79.     <script>
  80.         // 1. 获取全部图片与按钮
  81.         const imgs = document.querySelectorAll(".slider .imgs img");
  82.         const btns = document.querySelectorAll(".slider .btns span");
  84.         // 2. 设置激活状态
  85.         function setActive() {
  86.             // 1. 清空图片所按钮的激活状态
  87.             imgs.forEach(img => img.classList.remove("active"));
  88.             btns.forEach(btn => btn.classList.remove("active"));
  90.             // 2.根据按钮的索引来确定应该将哪一张图片显示出来
  91.             event.target.classList.add("active");
  92.             imgs.forEach(img => {
  93.                 if (img.dataset.index === event.target.dataset.index) {
  94.                     img.classList.add("active");
  95.                 }
  96.             });
  97.         }
  99.         // 3. 定时播放
  100.         // 用到"事件派发器",来自动的模拟手工点击
  101.         setInterval(
  102.             function(arr) {
  103.                 // 使这个数组首尾相接实现无限循环效果
  104.                 let i = arr.shift();
  105.                 btns[i].dispatchEvent(new Event("click"));
  106.                 arr.push(i);
  107.             },
  108.             2000,
  109.             Object.keys(btns)
  110.         );
  111.     </script>
  112. </body>
  114. </html>
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：不必一定按照老师的方法，可以其他的思路试试轮播图
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