JS 图片的左右切换

图片的左右切换

<div class="slider">
  <img src="image1.jpg" alt="Image 1">
  <img src="image2.jpg" alt="Image 2">
  <img src="image3.jpg" alt="Image 3">
</div>
<button id="prevBtn">Previous</button>
<button id="nextBtn">Next</button>

.slider {
  position: relative;
  width: 500px;
  height: 300px;
  overflow: hidden;
}
 
.slider img {
  width: 100%;
  height: auto;
  display: none;
}
 
.slider img.active {
  display: block;
}

 <script type="text/javascript">
// 获取相关元素
var slider = document.querySelector('.slider');
var prevBtn = document.getElementById('prevBtn');
var nextBtn = document.getElementById('nextBtn');
var images = slider.getElementsByTagName('img');
var currentIndex = 0;
 
// 显示当前图片
function showImage(index) {
  // 移除所有图片的active类
  for (var i = 0; i < images.length; i++) {
    images[i].classList.remove('active');
  }
  // 添加当前图片的active类
  images[index].classList.add('active');
}
 
// 点击上一张按钮
prevBtn.addEventListener('click', function() {
  currentIndex--;
  if (currentIndex < 0) {
    currentIndex = images.length - 1;
  }
  showImage(currentIndex);
});
 
// 点击下一张按钮
nextBtn.addEventListener('click', function() {
  currentIndex++;
  if (currentIndex >= images.length) {
    currentIndex = 0;
  }
  showImage(currentIndex);
});
 
// 显示初始图片
showImage(currentIndex);
 
</script>