js如何写轮播

<div class="carousel">
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img src="image1.jpg" alt="Image 1">
    </div>
    <div class="carousel-item">
      <img src="image2.jpg" alt="Image 2">
    </div>
    <div class="carousel-item">
      <img src="image3.jpg" alt="Image 3">
    </div>
  </div>
  <button class="carousel-control prev">&#10094;</button>
  <button class="carousel-control next">&#10095;</button>
</div>

.carousel {
  position: relative;
  width: 80%;
  margin: auto;
}

.carousel-inner {
  position: relative;
  overflow: hidden;
  width: 100%;
}

.carousel-item {
  display: none;
  width: 100%;
}

.carousel-item.active {
  display: block;
}

.carousel-control {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
  background: rgba(0, 0, 0, 0.5);
  color: white;
  border: none;
  padding: 10px;
  cursor: pointer;
}

.carousel-control.prev {
  left: 0;
}

.carousel-control.next {
  right: 0;
}

document.addEventListener('DOMContentLoaded', function() {
  const carouselInner = document.querySelector('.carousel-inner');
  const items = document.querySelectorAll('.carousel-item');
  const prevButton = document.querySelector('.carousel-control.prev');
  const nextButton = document.querySelector('.carousel-control.next');
  let currentIndex = 0;

  function showItem(index) {
    items.forEach((item, i) => {
      item.classList.toggle('active', i === index);
    });
  }

  function nextItem() {
    currentIndex = (currentIndex + 1) % items.length;
    showItem(currentIndex);
  }

  function prevItem() {
    currentIndex = (currentIndex - 1 + items.length) % items.length;
    showItem(currentIndex);
  }

  prevButton.addEventListener('click', prevItem);
  nextButton.addEventListener('click', nextItem);

  // 自动播放功能
  setInterval(nextItem, 3000); // 每3秒切换一次
});