帮我用js写一个轮播图 要求会动态滚动

当然，我可以为您提供代码示例。以下是一个简单的基于JavaScript的轮播图实现：

HTML:

<div class="slideshow-container">
  <div class="mySlides">
    <img src="img1.jpg">
  </div>

  <div class="mySlides">
    <img src="img2.jpg">
  </div>

  <div class="mySlides">
    <img src="img3.jpg">
  </div>

  <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
  <a class="next" onclick="plusSlides(1)">&#10095;</a>
</div>

CSS:

.slideshow-container {
  max-width: 1000px;
  position: relative;
  margin: auto;
}

.mySlides {
  display: none;
  text-align: center;
}

img {
  max-width: 100%;
  height: auto;
  vertical-align: middle;
}

.prev,
.next {
  cursor: pointer;
  position: absolute;
  top: 50%;
  width: auto;
  margin-top: -22px;
  padding: 16px;
  color: white;
  font-weight: bold;
  font-size: 18px;
  transition: 0.6s ease;
  border-radius: 0 3px 3px 0;
  user-select: none;
}

.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

.prev:hover,
.next:hover {
  background-color: rgba(0, 0, 0, 0.8);
}

JavaScript:

var slideIndex = 1;
showSlides(slideIndex);

function plusSlides(n) {
  showSlides((slideIndex += n));
}

function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("mySlides");
  if (n > slides.length) {
    slideIndex = 1;
  }
  if (n < 1) {
    slideIndex = slides.length;
  }
  for (i = 0; i < slides.length; i++) {
    slides[i].style.display = "none";
  }
  slides[slideIndex - 1].style.display = "block";
}

这是一个基本的轮播图实现，您可以根据需要对其进行修改和定制。