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轮播图实例
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  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>Document</title>
  9.     <style>
  10.         * {
  11.             margin: 0;
  12.             padding: 0;
  13.             box-sizing: border-box;
  14.         }
  16.         .slideshow {
  17.             width: 240px;
  18.             height: 360px;
  19.         }
  21.         .slideshow .imgs {
  22.             width: inherit;
  23.             height: inherit;
  24.         }
  26.         .slideshow img {
  27.             width: 100%;
  28.             height: 100%;
  29.             border-radius: 10px;
  30.             /* 默认情况下需要全部隐藏 */
  31.             display: none;
  32.         }
  34.         /* 当class有active的属性时,为激活状态 显示图片 */
  35.         .slideshow img.active {
  36.             display: block;
  37.         }
  39.         /* 当鼠标悬停时,有点击模样 */
  40.         .slideshow img:hover {
  41.             cursor: pointer;
  42.         }
  44.         .slideshow .btns {
  45.             display: flex;
  46.             place-content: center;
  47.             transform: translateY(-40px);
  48.         }
  50.         .slideshow span {
  51.             height: 16px;
  52.             width: 16px;
  53.             /* 未激活属于透明状态 */
  54.             background-color: rgba(233, 233, 233, 0.5);
  55.             margin: 5px;
  56.             border-radius: 50%;
  57.         }
  59.         .slideshow span.active {
  60.             /* 激活状态给个颜色 */
  61.             background-color: orangered;
  62.         }
  64.         .slideshow span:hover {
  65.             cursor: pointer;
  66.         }
  67.     </style>
  68. </head>
  70. <body>
  71.     <div class="slideshow">
  72.         <!-- 1. 图片容器 -->
  73.         <div class="imgs">
  74.             <!-- <img src="./1111/slideshow/static/images/item1.jpeg" alt="" class="active" />
  75.             <img src="./1111/slideshow/static/images/item2.jpeg" alt="" />
  76.             <img src="./1111/slideshow/static/images/item3.jpeg" alt="" /> -->
  77.         </div>
  78.         <!-- 2. 按钮容器 -->
  79.         <div class="btns">
  80.             <!-- <span class="active"></span>
  81.             <span></span>
  82.             <span></span> -->
  83.         </div>
  84.     </div>
  85.     <script type="module">
  86.         import { createImgs, createBtns, switchImg, timePlay } from '/pic.js';
  87.         // 拿到容器 方便以下直接使用
  88.         const imgs = document.querySelector('.imgs');
  89.         const btns = document.querySelector('.btns');
  90.           //网站一加载 就开始运行这些js
  91.         window.onload = function () {
  92.             // 创建图片组
  93.             createImgs(imgs)
  94.             // 创建按钮组
  95.             createBtns(imgs, btns)
  96.             //btns.children是个类数组,用...转换成数组 使用foreach 让每个按钮都绑定上点击事件
  97.             const arrbtn = [...btns.children];
  98.             arrbtn.forEach(function (btn) {
  99.                 btn.onclick = function () {
  100.                     switchImg(this, imgs)
  101.                 }
  102.             })
  103.             const btnArr = [...btns.children];
  104.             // 按钮索引的数组
  105.             const btnKeys = Object.keys(btns.children);
  106.             setInterval(
  107.                 function (btnArr, btnKeys) {
  108.                     timePlay(btnArr, btnKeys);
  109.                 },
  110.                 1000,
  111.                 btnArr,
  112.                 btnKeys
  113.             );
  114.         }
  116.     </script>
  117. </body>
  119. </html>
  1. const Arrimg = [
  2.   {
  3.     key: 1,
  4.     url: "http://baidu.com",
  5.     src: "./1111/slideshow/static/images/item1.jpeg",
  6.   },
  7.   {
  8.     key: 2,
  9.     url: "http://baidu.com",
  10.     src: "./1111/slideshow/static/images/item2.jpeg",
  11.   },
  12.   {
  13.     key: 3,
  14.     url: "http://baidu.com",
  15.     src: "./1111/slideshow/static/images/item3.jpeg",
  16.   },
  17. ];
  18. // 创建图片
  19. function createImgs(imgs) {
  20.   // 创建局部代码片段
  21.   const frag = new DocumentFragment();
  23.   for (let i = 0; i < Arrimg.length; i++) {
  24.     // 创建img
  25.     const img = document.createElement("img");
  26.     img.src = Arrimg[i].src;
  27.     img.dataset.key = Arrimg[i].key;
  28.     // 让第一个img处于激活状态
  29.     if (i === 0) {
  30.       img.classList.add("active");
  31.     }
  32.     //给每个图片绑定上一个点击事件
  33.     img.onclick = function () {
  34.       location.href = Arrimg[i].url;
  35.     };
  36.     // 把每个img加入到临时代码片段中
  37.     frag.append(img);
  38.   }
  39.   // 加入到图片容器
  40.   imgs.append(frag);
  41. }
  42. // 创建按钮 有多少图片 就要创建多少按钮
  43. function createBtns(imgs, btns) {
  44.   // 数组长度 就是按钮的个数
  45.   let length = Arrimg.length;
  46.   for (let i = 0; i < length; i++) {
  47.     // 创建按钮元素
  48.     const btn = document.createElement("span");
  49.     // 让按钮的key 和 图片的key 一一对应
  50.     btn.dataset.key =
  51.       imgs.children[i].dataset.key;
  52.       // 同样 让第一个按钮处于激活状态
  53.     if (i === 0) {
  54.       btn.classList.add("active");
  55.     }
  56.     // 把每个btn 加入到按钮容器中
  57.     btns.append(btn);
  58.   }
  59. }
  61. //  创建按钮点击事件 切换激活状态
  62. function switchImg(btn, imgs) {
  63.   // 先让所有按钮的激活状态全部取消
  64.   [...btn.parentNode.children].forEach(btn =>
  65.     btn.classList.remove("active")
  66.   );
  67.   [...imgs.children].forEach(img =>
  68.     img.classList.remove("active")
  69.   );
  71.   // 2. 将当前的按钮处于激活状态
  72.   btn.classList.add("active");
  74.   // 3. 根据按钮索引,找到对应的图片
  75.   const currImg = [...imgs.children].find(
  76.     function (img) {
  77.       return img.dataset.key == btn.dataset.key;
  78.     }
  79.   );
  80.   currImg.classList.add("active");
  81. }
  82. // 定时播放
  83. function timePlay(btnArr, btnKeys) {
  84.   // 1. 头部取一个
  85.   let key = btnKeys.shift();
  87.   // 2. 根据索引找到对应的按钮,再给它自动派发一个点击事件
  88.   btnArr[key].dispatchEvent(new Event("click"));
  90.   // 3. 把刚才到出的按钮再从尾部进入,实现首尾相连
  91.   btnKeys.push(key);
  92. }
  93. export { createImgs, createBtns, switchImg ,timePlay};
Correcting teacher：PHPzPHPz

Correction status：qualified

Teacher's comments：总体效果不错, 继续加油
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