设置HTML中的属性时，滑动滑块将类添加到活动幻灯片

<div class="slideshow">
  <!-- 幻灯片内容 -->
</div>

.slideshow {
  width: 500px;
  height: 300px;
  background-color: #f1f1f1;
}

<input type="range" min="1" max="3" step="1" id="slider">

document.getElementById("slider").addEventListener("change", function() {
  var value = this.value; // 获取滑块的值
  var slideshow = document.getElementsByClassName("slideshow")[0];
  
  if (value == 1) {
    slideshow.classList.add("active"); // 添加活动幻灯片类
  } else {
    slideshow.classList.remove("active"); // 移除活动幻灯片类
  }
});

.slideshow.active {
  border: 2px solid #000;
  box-shadow: 0 0 5px rgba(0, 0, 0, 0.3);
  transition: all 0.3s ease;
}