js怎样实现图片轮播

JavaScript 实现图片轮播主要涉及HTML、CSS和JavaScript三个部分。以下是一个简单的图片轮播实现示例：

HTML结构

<div class="carousel">
  <div class="carousel-inner">
    <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 class="carousel-control prev">&#10094;</button>
  <button class="carousel-control next">&#10095;</button>
</div>

CSS样式

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

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

.carousel-inner img {
  width: 100%;
  flex-shrink: 0;
}

.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;
}

JavaScript逻辑

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

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

  prevButton.addEventListener('click', () => {
    currentIndex = (currentIndex > 0) ? currentIndex - 1 : images.length - 1;
    updateCarousel();
  });

  nextButton.addEventListener('click', () => {
    currentIndex = (currentIndex < images.length - 1) ? currentIndex + 1 : 0;
    updateCarousel();
  });
});