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JavaScript如何实现简单的图片切换功能(实例代码)

发布时间：2023-05-23 23:41:24 来源：互联网

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春天到了，各种绚丽的花朵都开放了，金黄的油菜花，成了蝴蝶的天地，美丽的蝴蝶在金黄色的舞台上跳着柔和而优美的舞姿。它们一会儿在空中飞舞，一会儿静静地停留在油菜花上。给春天增添了不少乐趣。油菜花的美丽，同时也吸引了不少 "劳动人民 "——蜜蜂，它们总是不分昼夜地不辞辛劳地给油菜花授粉。偶尔一阵微风吹来，金黄的油菜花立刻涌起了高低起伏的 "金浪花 "。远远望去，真是美不胜收！

代码如下所示：

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <title>图片切换</title>
  <style>
    *{
      margin: 0;
      padding: 0;
    }
    .box{
      width: 200px;
      height: 300px;
      margin: 50px auto;
      padding: 20px;
      background-color: skyblue;
      text-align: center;
    }
    img{
      width: 200px;
      height: 200px;
      margin: 20px 0;
    }
  </style>
  <script>
    // 存储照片地址的数组
    let imgArr = ["https://images.cnblogs.com/cnblogs_com/TomHe789/1693260/o_200409051704animal1.png", "https://images.cnblogs.com/cnblogs_com/TomHe789/1693260/o_200409051711animal2.png", "https://images.cnblogs.com/cnblogs_com/TomHe789/1693260/o_200409051717animal3.png", "https://images.cnblogs.com/cnblogs_com/TomHe789/1693260/o_200409051722animal4.png", "https://images.cnblogs.com/cnblogs_com/TomHe789/1693260/o_200409051726animal5.png"];

    // 照片的索引
    let index = 0;
    window.onload = function() {
      let oP = document.getElementsByTagName("p")[0];
      oP.innerHTML = "一共有" + imgArr.length + "张照片,这是第" + (index+1) +"张";

      let oImg = document.getElementsByTagName("img")[0];
      let oPrev = document.getElementsByClassName("prev")[0];
      let oNext = document.getElementsByClassName("next")[0];

      // 点击上一张响应事件
      oPrev.onclick = function () {
        index--;
        //实现照片循环
        if (index < 0) {
          index = imgArr.length-1;
        }
        oP.innerHTML = "一共有" + imgArr.length + "张照片,这是第" + (index+1) +"张";
        oImg.src = imgArr[index];

      };

      // 点击下一张响应事件
      oNext.onclick = function () {
        index++;
        //实现照片循环
        if (index >= imgArr.length) {
          index = 0;
        }
        oP.innerHTML = "一共有" + imgArr.length + "张照片,这是第" + (index+1) +"张";
        oImg.src = imgArr[index];
      };
    };
  </script>
</head>
<body>
  <div class="box">
    <p></p>
    <img src="../../images/animal1.png" alt="">
    <button class="prev">上一张</button>
    <button class="next">下一张</button>
  </div>
</body>
</html>

最终的效果