js左右切换轮播代码

<div class="carousel">
  <div class="carousel-inner">
    <div class="carousel-item active">图片 1</div>
    <div class="carousel-item">图片 2</div>
    <div class="carousel-item">图片 3</div>
  </div>
  <button class="prev-btn">上一张</button>
  <button class="next-btn">下一张</button>
</div>

.carousel {
  position: relative;
  width: 500px;
  height: 300px;
  overflow: hidden;
}

.carousel-inner {
  display: flex;
  transition: transform 0.5s ease-in-out;
}

.carousel-item {
  width: 100%;
  height: 100%;
  display: flex;
  justify-content: center;
  align-items: center;
  background-color: #ccc;
  border-right: 1px solid #fff;
}

.prev-btn,
.next-btn {
  position: absolute;
  top: 50%;
  transform: translateY(-50%);
}

.prev-btn {
  left: 10px;
}

.next-btn {
  right: 10px;
}

const carouselInner = document.querySelector('.carousel-inner');
const items = document.querySelectorAll('.carousel-item');
const prevBtn = document.querySelector('.prev-btn');
const nextBtn = document.querySelector('.next-btn');

let currentIndex = 0;

function updateCarousel() {
  const offset = -currentIndex * 100;
  carouselInner.style.transform = `translateX(${offset}%)`;
}

prevBtn.addEventListener('click', () => {
  currentIndex = (currentIndex - 1 + items.length) % items.length;
  updateCarousel();
});

nextBtn.addEventListener('click', () => {
  currentIndex = (currentIndex + 1) % items.length;
  updateCarousel();
});