JS图片轮播实现方法与代码教程

  

    
    
    
  
  <
  >
  

    
    
    
  

.carousel {
  position: relative;
  width: 600px;
  height: 400px;
  overflow: hidden;
  margin: 20px auto;
}
.slides {
display: flex;
width: 300%;
height: 400px;
transition: transform 0.5s ease;
}
.slides img {
width: 100%;
height: 100%;
object-fit: cover;
flex-shrink: 0;
}
.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;
}
.prev { left: 10px; }
.next { right: 10px; }
.dots {
position: absolute;
bottom: 20px;
width: 100%;
text-align: center;
}
.dot {
display: inline-block;
width: 12px;
height: 12px;
background: #bbb;
border-radius: 50%;
margin: 0 5px;
cursor: pointer;
}
.dot.active {
background: #fff;
}

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