HTML5轮播图教程与组件开发详解

<div class="carousel">
  <div class="carousel-inner">
    <div class="carousel-item active">
      <img src="image1.jpg" alt="Slide 1">
    </div>
    <div class="carousel-item">
      <img src="image2.jpg" alt="Slide 2">
    </div>
    <div class="carousel-item">
      <img src="image3.jpg" alt="Slide 3">
    </div>
  </div>
<p><button class="carousel-prev">❮</button>
<button class="carousel-next">❯</button></p><p><div class="carousel-indicators">
<span class="indicator active" data-index="0"></span>
<span class="indicator" data-index="1"></span>
<span class="indicator" data-index="2"></span>
</div>
</div></p>

.carousel {
  position: relative;
  width: 800px;
  height: 400px;
  margin: 50px auto;
  overflow: hidden;
}
<p>.carousel-inner {
position: relative;
width: 100%;
height: 100%;
}</p><p>.carousel-item {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
opacity: 0;
transition: opacity 0.5s ease;
}</p><p>.carousel-item.active {
opacity: 1;
}</p><p>.carousel-item img {
width: 100%;
height: 100%;
object-fit: cover;
}</p><p>.carousel-prev,
.carousel-next {
position: absolute;
top: 50%;
transform: translateY(-50%);
background: rgba(0,0,0,0.5);
color: white;
border: none;
padding: 10px 15px;
font-size: 20px;
cursor: pointer;
z-index: 10;
}</p><p>.carousel-prev {
left: 10px;
}</p><p>.carousel-next {
right: 10px;
}</p><p>.carousel-indicators {
position: absolute;
bottom: 20px;
left: 50%;
transform: translateX(-50%);
display: flex;
gap: 10px;
}</p><p>.indicator {
width: 12px;
height: 12px;
background: #ccc;
border-radius: 50%;
cursor: pointer;
}</p><p>.indicator.active {
background: white;
}</p>

document.addEventListener('DOMContentLoaded', function () {
  const items = document.querySelectorAll('.carousel-item');
  const indicators = document.querySelectorAll('.indicator');
  const prevBtn = document.querySelector('.carousel-prev');
  const nextBtn = document.querySelector('.carousel-next');
  let currentIndex = 0;
  const totalItems = items.length;
<p>// 切换到指定索引
function goToIndex(index) {
if (index < 0) index = totalItems - 1;
if (index >= totalItems) index = 0;</p><pre class="brush:php;toolbar:false;">items[currentIndex].classList.remove('active');
indicators[currentIndex].classList.remove('active');

currentIndex = index;

items[currentIndex].classList.add('active');
indicators[currentIndex].classList.add('active');

}

// 下一张 function nextSlide() { goToIndex(currentIndex + 1); }

// 上一张 function prevSlide() { goToIndex(currentIndex - 1); }

// 指示点点击 indicators.forEach((dot, index) => { dot.addEventListener('click', () => { goToIndex(index); }); });

// 按钮事件 nextBtn.addEventListener('click', nextSlide); prevBtn.addEventListener('click', prevSlide);

// 自动播放（每3秒切换） let interval = setInterval(nextSlide, 3000);

// 鼠标进入暂停，离开继续 const carousel = document.querySelector('.carousel'); carousel.addEventListener('mouseenter', () => { clearInterval(interval); }); carousel.addEventListener('mouseleave', () => { interval = setInterval(nextSlide, 3000); }); });