JavaScript를 사용하여 사진 앨범을 만드는 방법

<div class="gallery">
  <div class="thumbnails">
    <!-- 用于展示照片缩略图的容器 -->
  </div>
  <div class="photo">
    <img id="photoImg" src="" alt="照片">
    <div class="nav">
      <button id="prevBtn" class="btn">上一张</button>
      <button id="nextBtn" class="btn">下一张</button>
    </div>
  </div>
</div>

.gallery {
  max-width: 800px;
  margin: auto;
}

.thumbnails img {
  max-width: 100%;
  height: auto;
  cursor: pointer;
}

.photo {
  text-align: center;
  margin-top: 20px;
}

#photoImg {
   max-width: 100%;
   height: auto;
}

.nav {
  margin-top: 20px;
}

.btn {
  display: inline-block;
  margin-right: 20px;
  padding: 5px 10px;
  background-color: #007bff;
  color: #fff;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

// 照片列表
const photoList = [
  {
    src: "./images/1.jpg",
    alt: "第一张照片"
  },
  {
    src: "./images/2.jpg",
    alt: "第二张照片"
  },
  {
    src: "./images/3.jpg",
    alt: "第三张照片"
  }
];

// 缩略图列表
const thumbList = [
  "./images/thumb/1.jpg",
  "./images/thumb/2.jpg",
  "./images/thumb/3.jpg"
];

// 当前照片下标
let currentPhotoIndex = 0;

// 初始化缩略图
const thumbnails = document.querySelector(".thumbnails");
thumbList.forEach((thumbUrl, i) => {
  const img = document.createElement("img");
  img.src = thumbUrl;
  img.alt = `缩略图${i + 1}`;
  img.addEventListener("click", () => {
    showPhoto(i);
  });
  thumbnails.appendChild(img);
});

// 初始化照片
showPhoto(currentPhotoIndex);

// 切换上一张照片
document.querySelector("#prevBtn").addEventListener("click", () => {
  currentPhotoIndex = currentPhotoIndex > 0 ? currentPhotoIndex - 1 : photoList.length - 1;
  showPhoto(currentPhotoIndex);
});

// 切换下一张照片
document.querySelector("#nextBtn").addEventListener("click", () => {
  currentPhotoIndex = currentPhotoIndex < photoList.length - 1 ? currentPhotoIndex + 1 : 0;
  showPhoto(currentPhotoIndex);
});

// 展示指定下标的照片
function showPhoto(index) {
  const photoImg = document.querySelector("#photoImg");
  photoImg.src = photoList[index].src;
  photoImg.alt = photoList[index].alt;
}