HTML+CSS+JavaScript：轮播图自动播放-Toy模板网

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一、需求

轮播图如下图所示，需求是每隔一秒轮播图自动切换一次

HTML+CSS+JavaScript：轮播图自动播放,html,css,javascript

二、代码素材

以下是缺失JS部分的代码，感兴趣的小伙伴可以先自己试着写一写

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>轮播图点击切换</title>
    <style>
        * {
            box-sizing: border-box;
        }

        .slider {
            width: 560px;
            height: 400px;
            overflow: hidden;
        }

        .slider-wrapper {
            width: 100%;
            height: 320px;
        }

        .slider-wrapper img {
            width: 100%;
            height: 100%;
            display: block;
        }

        .slider-footer {
            height: 80px;
            background-color: rgb(100, 67, 68);
            padding: 12px 12px 0 12px;
            position: relative;
        }

        .slider-footer .toggle {
            position: absolute;
            right: 0;
            top: 12px;
            display: flex;
        }

        .slider-footer .toggle button {
            margin-right: 12px;
            width: 28px;
            height: 28px;
            appearance: none;
            border: none;
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
            border-radius: 4px;
            cursor: pointer;
        }

        .slider-footer .toggle button:hover {
            background: rgba(255, 255, 255, 0.2);
        }

        .slider-footer p {
            margin: 0;
            color: #fff;
            font-size: 18px;
            margin-bottom: 10px;
        }

        .slider-indicator {
            margin: 0;
            padding: 0;
            list-style: none;
            display: flex;
            align-items: center;
        }

        .slider-indicator li {
            width: 8px;
            height: 8px;
            margin: 4px;
            border-radius: 50%;
            background: #fff;
            opacity: 0.4;
            cursor: pointer;
        }

        .slider-indicator li.active {
            width: 12px;
            height: 12px;
            opacity: 1;
        }
    </style>
</head>

<body>
    <div class="slider">
        <div class="slider-wrapper">
            <img src="./images/slider01.jpg" alt="" />
        </div>
        <div class="slider-footer">
            <p>对人类来说会不会太超前了？</p>
            <ul class="slider-indicator">
                <li class="active"></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
            </ul>
            <div class="toggle">
                <button class="prev">&lt;</button>
                <button class="next">&gt;</button>
            </div>
        </div>
    </div>
    <script>
        // 1. 初始数据
        const sliderData = [
            { url: './images/slider01.jpg', title: '对人类来说会不会太超前了？', color: 'rgb(100, 67, 68)' },
            { url: './images/slider02.jpg', title: '开启剑与雪的黑暗传说！', color: 'rgb(43, 35, 26)' },
            { url: './images/slider03.jpg', title: '真正的jo厨出现了！', color: 'rgb(36, 31, 33)' },
            { url: './images/slider04.jpg', title: '李玉刚：让世界通过B站看到东方大国文化', color: 'rgb(139, 98, 66)' },
            { url: './images/slider05.jpg', title: '快来分享你的寒假日常吧~', color: 'rgb(67, 90, 92)' },
            { url: './images/slider06.jpg', title: '哔哩哔哩小年YEAH', color: 'rgb(166, 131, 143)' },
            { url: './images/slider07.jpg', title: '一站式解决你的电脑配置问题！！！', color: 'rgb(53, 29, 25)' },
            { url: './images/slider08.jpg', title: '谁不想和小猫咪贴贴呢！', color: 'rgb(99, 72, 114)' },
        ]
    </script>
</body>

</html>

三、算法思路

1、将代码素材在浏览器中打开，并按F12进入开发者模式，分析各个HTML标签在轮播图中的位置及作用

2、获取相关元素

3、利用间歇函数实现一秒切换一次的功能，间歇函数中的计数器 i 配合素材代码中的数组对象实现图片和文字等样式的顺序播放文章来源地址https://www.toymoban.com/news/detail-621334.html

四、完整代码

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>轮播图点击切换</title>
    <style>
        * {
            box-sizing: border-box;
        }

        .slider {
            width: 560px;
            height: 400px;
            overflow: hidden;
        }

        .slider-wrapper {
            width: 100%;
            height: 320px;
        }

        .slider-wrapper img {
            width: 100%;
            height: 100%;
            display: block;
        }

        .slider-footer {
            height: 80px;
            background-color: rgb(100, 67, 68);
            padding: 12px 12px 0 12px;
            position: relative;
        }

        .slider-footer .toggle {
            position: absolute;
            right: 0;
            top: 12px;
            display: flex;
        }

        .slider-footer .toggle button {
            margin-right: 12px;
            width: 28px;
            height: 28px;
            appearance: none;
            border: none;
            background: rgba(255, 255, 255, 0.1);
            color: #fff;
            border-radius: 4px;
            cursor: pointer;
        }

        .slider-footer .toggle button:hover {
            background: rgba(255, 255, 255, 0.2);
        }

        .slider-footer p {
            margin: 0;
            color: #fff;
            font-size: 18px;
            margin-bottom: 10px;
        }

        .slider-indicator {
            margin: 0;
            padding: 0;
            list-style: none;
            display: flex;
            align-items: center;
        }

        .slider-indicator li {
            width: 8px;
            height: 8px;
            margin: 4px;
            border-radius: 50%;
            background: #fff;
            opacity: 0.4;
            cursor: pointer;
        }

        .slider-indicator li.active {
            width: 12px;
            height: 12px;
            opacity: 1;
        }
    </style>
</head>

<body>
    <div class="slider">
        <div class="slider-wrapper">
            <img src="./images/slider01.jpg" alt="" />
        </div>
        <div class="slider-footer">
            <p>对人类来说会不会太超前了？</p>
            <ul class="slider-indicator">
                <li class="active"></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
                <li></li>
            </ul>
            <div class="toggle">
                <button class="prev">&lt;</button>
                <button class="next">&gt;</button>
            </div>
        </div>
    </div>
    <script>
        // 1. 初始数据
        const sliderData = [
            { url: './images/slider01.jpg', title: '对人类来说会不会太超前了？', color: 'rgb(100, 67, 68)' },
            { url: './images/slider02.jpg', title: '开启剑与雪的黑暗传说！', color: 'rgb(43, 35, 26)' },
            { url: './images/slider03.jpg', title: '真正的jo厨出现了！', color: 'rgb(36, 31, 33)' },
            { url: './images/slider04.jpg', title: '李玉刚：让世界通过B站看到东方大国文化', color: 'rgb(139, 98, 66)' },
            { url: './images/slider05.jpg', title: '快来分享你的寒假日常吧~', color: 'rgb(67, 90, 92)' },
            { url: './images/slider06.jpg', title: '哔哩哔哩小年YEAH', color: 'rgb(166, 131, 143)' },
            { url: './images/slider07.jpg', title: '一站式解决你的电脑配置问题！！！', color: 'rgb(53, 29, 25)' },
            { url: './images/slider08.jpg', title: '谁不想和小猫咪贴贴呢！', color: 'rgb(99, 72, 114)' },
        ]

        const img=document.querySelector('.slider-wrapper img')
        const p=document.querySelector('.slider-footer p')
        const ul=document.querySelector('.slider-footer .slider-indicator')
        const footer=document.querySelector('.slider-footer')

        let i=0
        setInterval(()=>{
            i = (i + 1) % 8
            img.src=`./images/slider0${i+1}.jpg`
            p.innerHTML=sliderData[i].title
            footer.style.backgroundColor=sliderData[i].color
            //注意classList.remove()括号中的类名不需要加点号！
            document.querySelector('.slider-indicator .active').classList.remove('active')
            document.querySelector(`.slider-indicator li:nth-child(${i+1})`).classList.add('active')
        },1000)
    </script>
</body>

</html>

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