JS图片轮播实现方法与代码教程

<div class="carousel">
  <div class="slides">
    <img src="image1.jpg" alt="图片1">
    <img src="image2.jpg" alt="图片2">
    <img src="image3.jpg" alt="图片3">
  </div>
  <button class="prev" onclick="prevSlide()"><</button>
  <button class="next" onclick="nextSlide()">></button>
  <div class="dots">
    <span class="dot" onclick="currentSlide(1)"></span>
    <span class="dot" onclick="currentSlide(2)"></span>
    <span class="dot" onclick="currentSlide(3)"></span>
  </div>
</div>

.carousel {
  position: relative;
  width: 600px;
  height: 400px;
  overflow: hidden;
  margin: 20px auto;
}
<p>.slides {
display: flex;
width: 300%;
height: 400px;
transition: transform 0.5s ease;
}</p><p>.slides img {
width: 100%;
height: 100%;
object-fit: cover;
flex-shrink: 0;
}</p><p>.prev, .next {
position: absolute;
top: 50%;
transform: translateY(-50%);
background: rgba(0,0,0,0.5);
color: white;
border: none;
padding: 10px 15px;
cursor: pointer;
font-size: 18px;
border-radius: 5px;
}</p><p>.prev { left: 10px; }
.next { right: 10px; }</p><p>.dots {
position: absolute;
bottom: 20px;
width: 100%;
text-align: center;
}</p><p>.dot {
display: inline-block;
width: 12px;
height: 12px;
background: #bbb;
border-radius: 50%;
margin: 0 5px;
cursor: pointer;
}</p><p>.dot.active {
background: #fff;
}</p>

let slideIndex = 0;
const slides = document.querySelector('.slides');
const dots = document.querySelectorAll('.dot');
<p>function showSlide(n) {
const total = 3; // 图片数量
if (n >= total) slideIndex = 0;
else if (n < 0) slideIndex = total - 1;
else slideIndex = n;</p><p>slides.style.transform = <code>translateX(-${slideIndex * 600}px)</code>; // 每张图宽600px</p><p>// 更新指示点
dots.forEach((dot, index) => {
dot.classList.toggle('active', index === slideIndex);
});
}</p><p>function nextSlide() {
showSlide(slideIndex + 1);
}</p><p>function prevSlide() {
showSlide(slideIndex - 1);
}</p><p>function currentSlide(n) {
showSlide(n - 1);
}</p><p>// 自动播放（可选）
setInterval(() => {
nextSlide();
}, 3000); // 每3秒切换一次</p>