Javascript - 图像滑块无法正常工作

Question

图像滑块在底部单击时不显示图像。

可能是什么问题？

它在uc浏览器中显示不同，在firefox中显示不同

var slideIndex = 1;
showSlides(slideIndex);

// Next/previous controls
function plusSlides(n) {
  showSlides(slideIndex += n);
}

// Thumbnail image controls
function currentSlide(n) {
  showSlides(slideIndex = n);
}

function showSlides(n) {
  var i;
  var slides = document.getElementsByClassName("mySlides");
  var dots = document.getElementsByClassName("demo");
  var 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;
}

<div class="container">
  <!-- Container for the image gallery -->
  <!-- Full-width images with number text -->
  <div class="mySlides">
    <img src="https://via.placeholder.com/350x150" style="width:100%"><br/>
  </div>
  <!-- Next and previous buttons -->
  <a class="prev" onclick="plusSlides(-1)">&#10094;</a>
  <a class="next" onclick="plusSlides(1)">&#10095;</a>
  <!-- Image text -->
  <div class="caption-container">
    <p id="caption"></p>
  </div>
  <!-- Thumbnail images -->
  <div class="row">
    <div class="column">
      <img class="demo cursor" src="https://via.placeholder.com/50x50" style="width:100%" onclick="currentSlide({{$i}})" alt="good">
    </div>
  </div>
</div>