页面布局

<section aria-label="图片列表">
  <div class="carousel" data-carousel>
    <button class="carousel-button prev" data-carousel-button="prev">
      上一张
    </button>
    <button class="carousel-button next" data-carousel-button="next">
      下一张
    </button>
    <ul data-slides>
      <li class="slide" data-active>
        <img src="./images/demo1.jpg" alt="示例图片1" />
      </li>
      <li class="slide">
        <img src="./images/demo2.jpg" alt="示例图片2" />
      </li>
      <li class="slide">
        <img src="./images/demo3.jpg" alt="示例图片3" />
      </li>
      <li class="slide">
        <img src="./images/demo4.jpg" alt="示例图片4" />
      </li>
      <li class="slide">
        <img src="./images/demo5.jpg" alt="示例图片5" />
      </li>
    </ul>
  </div>
</section>

交互代码

const buttons = document.querySelectorAll("[data-carousel-button]");

buttons.forEach((button) => {
  button.addEventListener("click", () => {
    const offset = button.dataset.carouselButton === "next" ? 1 : -1;
    const slides = button
      .closest("[data-carousel]")
      .querySelector("[data-slides]");

    const activeSlide = slides.querySelector("[data-active]");
    let newIndex = [...slides.children].indexOf(activeSlide) + offset;

    if (newIndex < 0) newIndex = slides.children.length - 1;
    if (newIndex >= slides.children.length) newIndex = 0;

    slides.children[newIndex].dataset.active = true;
    delete activeSlide.dataset.active;
  });
});

样式

*,
*::before,
*::after {
  box-sizing: border-box;
}

body,
ul,
li {
  margin: 0;
  padding: 0;
}

.carousel {
  width: 100vw;
  height: 100vh;
  position: relative;
}

ul {
  list-style: none;
}

.slide {
  position: absolute;
  inset: 0;
  opacity: 0;
  transition: 200ms opacity ease-in-out;
  transition-delay: 200ms;
}

.slide > img {
  display: block;
  width: 100%;
  height: 100%;
  object-fit: cover;
  object-position: center;
}

.slide[data-active] {
  opacity: 1;
  z-index: 1;
  transition-delay: 0ms;
}

.carousel-button {
  position: absolute;
  background: none;
  border: none;
  font-size: 12px;
  top: 50%;
  transform: translateY(-50%);
  cursor: pointer;
  border-radius: 0.25rem;
  padding: 0.5rem;
  background-color: rgba(0, 0, 0, 0.1);
  z-index: 2;
}

.carousel-button:hover,
.carousel-button:focus {
  color: #fff;
  background-color: rgba(0, 0, 0, 0.2);
}

.carousel-button:focus {
  outline: 1px solid black;
}

.prev {
  left: 1rem;
}

.next {
  right: 1rem;
}

完整代码

完整代码示例下载