点击按钮实现多张图片的循环切换js

代码:


<html lang="ch">
    <head>
        <meta charset="UTF-8">
        <title>点击按钮实现多张图片的循环切换title>
        <style type="text/css">
            * {
      
                margin: 0;
                padding: 0;
            }

            .img-wrapper {
      
                width: 520px;
                height: 520px;
                background-size: contain;
                overflow: hidden;
                margin: 50px auto;
                background-color: green;
            }
            .img-wrapper img{
      
                width: 533px;
                height: 300px;
            }

            .img-wrapper p {
      
                text-align: center;
                height: 20px;
                line-height: 20px;
                font-size: 16px;
                margin-bottom: 10px;
                margin-top: 8px;
            }

            .img-wrapper button {
      
                margin: 12px 93px;
                font-size: 18px;
            }
        style>
        <script type="text/javascript">
            window.onload = function () {
      
                let prev = document.getElementById("prev");
                let next = document.getElementById("next");
                let img = document.getElementsByTagName("img")[0];
                let info = document.getElementById("info");
                //创建一个数组存储照片的路径
                let imgArr = ["img/111.jpg", "img/222.jpg", "img/333.jpg", "img/444.jpg", "img/555.jpg", "img/666.jpg"];
                let index = 0;
                info.innerText = "一共有" + imgArr.length + "张照片,现在是第" + (index + 1) + "张";
                prev.onclick = function () {
      
                    index--;
                    prev.style.backgroundColor="#ff4c31";
                    if (index < 0) {
      
                        index = imgArr.length - 1;
                    }
                    img.src = imgArr[index];
                    info.innerText = "一共有" + imgArr.length + "张照片,现在是第" + (index + 1) + "张";
                };

                next.onclick = function () {
      
                    index++;
                    next.style.backgroundColor="#ff4c31";
                    if (index > imgArr.length - 1) {
      
                        index = 0;
                    }
                    img.src = imgArr[index];
                    info.innerText = "一共有" + imgArr.length + "张照片,现在是第" + (index + 1) + "张";
                };

            };
        script>
    head>
    <body>
        <div class="img-wrapper">
            <p id="info">p>
            <img src="img/111.jpg">
            <button id="prev">上一张button>
            <button id="next">下一张button>
        div>
    body>
html>

效果:

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