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js实现无缝轮播

2026-03-01 02:38:32JavaScript

实现无缝轮播的思路

无缝轮播的核心在于当轮播到达最后一张时，能够平滑过渡到第一张，视觉上形成无限循环的效果。通常通过动态调整DOM元素或利用CSS过渡实现。

HTML结构

创建一个基础的轮播容器，包含图片列表和导航按钮：

<div class="slider">
  <div class="slider-container">
    <img src="image1.jpg" class="slide">
    <img src="image2.jpg" class="slide">
    <img src="image3.jpg" class="slide">
  </div>
  <button class="prev-btn">Previous</button>
  <button class="next-btn">Next</button>
</div>

CSS样式

设置轮播容器和图片的样式，确保溢出隐藏：

.slider {
  position: relative;
  width: 600px;
  height: 400px;
  overflow: hidden;
}

.slider-container {
  display: flex;
  transition: transform 0.5s ease;
}

.slide {
  width: 100%;
  height: 100%;
  flex-shrink: 0;
}

JavaScript实现

动态克隆首尾元素并处理过渡逻辑：

const container = document.querySelector('.slider-container');
const slides = document.querySelectorAll('.slide');
const prevBtn = document.querySelector('.prev-btn');
const nextBtn = document.querySelector('.next-btn');

// 克隆首尾元素实现无缝效果
const firstClone = slides[0].cloneNode(true);
const lastClone = slides[slides.length - 1].cloneNode(true);
container.appendChild(firstClone);
container.insertBefore(lastClone, slides[0]);

let currentIndex = 1;
const slideWidth = slides[0].clientWidth;
container.style.transform = `translateX(-${currentIndex * slideWidth}px)`;

function moveToSlide(index) {
  container.style.transition = 'transform 0.5s ease';
  container.style.transform = `translateX(-${index * slideWidth}px)`;
  currentIndex = index;
}

function handleTransitionEnd() {
  if (currentIndex === 0) {
    container.style.transition = 'none';
    currentIndex = slides.length;
    container.style.transform = `translateX(-${currentIndex * slideWidth}px)`;
  }
  if (currentIndex === slides.length + 1) {
    container.style.transition = 'none';
    currentIndex = 1;
    container.style.transform = `translateX(-${currentIndex * slideWidth}px)`;
  }
}

nextBtn.addEventListener('click', () => {
  moveToSlide(currentIndex + 1);
});

prevBtn.addEventListener('click', () => {
  moveToSlide(currentIndex - 1);
});

container.addEventListener('transitionend', handleTransitionEnd);

// 自动轮播
let interval = setInterval(() => {
  moveToSlide(currentIndex + 1);
}, 3000);

// 鼠标悬停暂停
container.parentElement.addEventListener('mouseenter', () => {
  clearInterval(interval);
});

container.parentElement.addEventListener('mouseleave', () => {
  interval = setInterval(() => {
    moveToSlide(currentIndex + 1);
  }, 3000);
});