如何创建：幻灯片图片库

学习如何使用 CSS 和 JavaScript 创建响应式幻灯片图库。

创建幻灯片画廊

第一步 - 添加 HTML：

<!-- 图片库的容器 -->
<div class="container">

  <!-- 带有数字文本的全宽图像 -->
  <div class="mySlides">
    <div class="numbertext">1 / 6</div>
      <img src="img_woods_wide.jpg" style="width:100%">
  </div>

  <div class="mySlides">
    <div class="numbertext">2 / 6</div>
      <img src="img_5terre_wide.jpg" style="width:100%">
  </div>

  <div class="mySlides">
    <div class="numbertext">3 / 6</div>
      <img src="img_mountains_wide.jpg" style="width:100%">
  </div>

  <div class="mySlides">
    <div class="numbertext">4 / 6</div>
      <img src="img_lights_wide.jpg" style="width:100%">
  </div>

  <div class="mySlides">
    <div class="numbertext">5 / 6</div>
      <img src="img_nature_wide.jpg" style="width:100%">
  </div>

  <div class="mySlides">
    <div class="numbertext">6 / 6</div>
      <img src="img_snow_wide.jpg" style="width:100%">
  </div>

  <!-- 下一个和上一个按钮 -->
  <a class="prev" onclick="plusSlides(-1)">❮</a>
  <a class="next" onclick="plusSlides(1)">❯</a>

  <!-- 图像文本 -->
  <div class="caption-container">
    <p id="caption"></p>
  </div>

  <!-- 缩略图 -->
  <div class="row">
    <div class="column">
      <img class="demo cursor" src="img_woods.jpg" style="width:100%" onclick="currentSlide(1)" alt="The Woods">
    </div>
    <div class="column">
      <img class="demo cursor" src="img_5terre.jpg" style="width:100%" onclick="currentSlide(2)" alt="Cinque Terre">
    </div>
    <div class="column">
      <img class="demo cursor" src="img_mountains.jpg" style="width:100%" onclick="currentSlide(3)" alt="Mountains and fjords">
    </div>
    <div class="column">
      <img class="demo cursor" src="img_lights.jpg" style="width:100%" onclick="currentSlide(4)" alt="Northern Lights">
    </div>
    <div class="column">
      <img class="demo cursor" src="img_nature.jpg" style="width:100%" onclick="currentSlide(5)" alt="Nature and sunrise">
    </div>
    <div class="column">
      <img class="demo cursor" src="img_snow.jpg" style="width:100%" onclick="currentSlide(6)" alt="Snowy Mountains">
    </div>
  </div>
</div>

第二步 - 添加 CSS：

设置图像画廊、下一个和上一个按钮、标题文本以及圆点的样式：

* {
  box-sizing: border-box;
}

/* 定位图像容器（需要定位左右箭头） */
.container {
  position: relative;
}

/* Hide the images by default */
.mySlides {
  display: none;
}

/* 将鼠标悬停在缩略图上时添加指针 */
.cursor {
  cursor: pointer;
}

/* 下一个和上一个按钮 */
.prev,
.next {
  cursor: pointer;
  position: absolute;
  top: 40%;
  width: auto;
  padding: 16px;
  margin-top: -50px;
  color: white;
  font-weight: bold;
  font-size: 20px;
  border-radius: 0 3px 3px 0;
  user-select: none;
  -webkit-user-select: none;
}

/* 将“下一步按钮”置于右侧 */
.next {
  right: 0;
  border-radius: 3px 0 0 3px;
}

/* 鼠标悬停时，添加带有一点透明度的黑色背景色 */
.prev:hover,
.next:hover {
  background-color: rgba(0, 0, 0, 0.8);
}

/* 数字文本 (1/3 等) */
.numbertext {
  color: #f2f2f2;
  font-size: 12px;
  padding: 8px 12px;
  position: absolute;
  top: 0;
}

/* 图像文本的容易 */
.caption-container {
  text-align: center;
  background-color: #222;
  padding: 2px 16px;
  color: white;
}

.row:after {
  content: "";
  display: table;
  clear: both;
}

/* 六列并排 */
.column {
  float: left;
  width: 16.66%;
}

/* 为缩略图添加透明效果 */
.demo {
  opacity: 0.6;
}

.active,
.demo:hover {
  opacity: 1;
}

第三步 - 添加 JavaScript：

let slideIndex = 1;
showSlides(slideIndex);

// 下一个/上一个控件
function plusSlides(n) {
  showSlides(slideIndex += n);
}

// 缩略图控件
function currentSlide(n) {
  showSlides(slideIndex = n);
}

function showSlides(n) {
  let i;
  let slides = document.getElementsByClassName("mySlides");
  let dots = document.getElementsByClassName("demo");
  let captionText = document.getElementById("caption");
  if (n > slides.length) {slideIndex = 1}
  if (n < 1) {slideIndex = slides.length}
  for (i = 0; i < slides.length; i++) {
    slides[i].style.display = "none";
  }
  for (i = 0; i < dots.length; i++) {
    dots[i].className = dots[i].className.replace(" active", "");
  }
  slides[slideIndex-1].style.display = "block";
  dots[slideIndex-1].className += " active";
  captionText.innerHTML = dots[slideIndex-1].alt;
}

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