请用js原生封装一个轮播图案例

好的，以下是一个基于原生JS实现的轮播图案例：

HTML部分：

<div class="slider">
  <div class="slider-wrapper">
    <img src="image1.jpg">
    <img src="image2.jpg">
    <img src="image3.jpg">
  </div>
  <div class="slider-dots">
    <span class="dot active"></span>
    <span class="dot"></span>
    <span class="dot"></span>
  </div>
</div>

CSS部分：

.slider {
  position: relative;
  overflow: hidden;
}
.slider-wrapper {
  display: flex;
  transition: transform 0.5s ease-out;
}
.slider-wrapper img {
  width: 100%;
  height: auto;
}
.slider-dots {
  position: absolute;
  bottom: 10px;
  left: 50%;
  transform: translateX(-50%);
  display: flex;
}
.slider-dots .dot {
  width: 10px;
  height: 10px;
  border-radius: 50%;
  background-color: #ccc;
  margin-right: 10px;
  cursor: pointer;
}
.slider-dots .active {
  background-color: #333;
}

JS部分：

const slider = document.querySelector('.slider');
const wrapper = slider.querySelector('.slider-wrapper');
const images = wrapper.querySelectorAll('img');
const dots = slider.querySelectorAll('.dot');

let currentImage = 0;
let interval;

function startSlider() {
  interval = setInterval(() => {
    currentImage++;
    if (currentImage >= images.length) {
      currentImage = 0;
    }
    goToImage(currentImage);
  }, 3000);
}

function goToImage(index) {
  wrapper.style.transform = `translateX(-${index * 100}%)`;
  updateDots(index);
}

function updateDots(index) {
  dots.forEach(dot => {
    dot.classList.remove('active');
  });
  dots[index].classList.add('active');
}

dots.forEach((dot, index) => {
  dot.addEventListener('click', () => {
    currentImage = index;
    goToImage(currentImage);
    clearInterval(interval);
    startSlider();
  });
});

startSlider();

这个轮播图实现了自动播放和手动切换图片的功能，并且可以根据当前显示的图片来更新底部的小圆点。