js点击左右切换图片

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>图片切换示例</title>
<style>
  .slider {
    width: 300px;
    overflow: hidden;
  }
  .slider img {
    width: 100%;
    display: none;
  }
  .slider img.active {
    display: block;
  }
</style>
</head>
<body>

<div class="slider">
  <img src="image1.jpg" alt="Image 1" class="active">
  <img src="image2.jpg" alt="Image 2">
  <img src="image3.jpg" alt="Image 3">
</div>

<button onclick="prevImage()">上一张</button>
<button onclick="nextImage()">下一张</button>

<script>
  let images = document.querySelectorAll('.slider img');
  let currentIndex = 0;

  function showImage(index) {
    images.forEach((img, i) => {
      img.classList.remove('active');
    });
    images[index].classList.add('active');
  }

  function nextImage() {
    currentIndex = (currentIndex + 1) % images.length;
    showImage(currentIndex);
  }

  function prevImage() {
    currentIndex = (currentIndex - 1 + images.length) % images.length;
    showImage(currentIndex);
  }
</script>

</body>
</html>

// 预加载图片
function preloadImages(images) {
  images.forEach(img => {
    const newImg = new Image();
    newImg.src = img.src;
  });
}

preloadImages(images);