javascript - 为什么切换图像时我的幻灯片显示在菜单上方？

Question

我的网页上有幻灯片。它使用以下脚本从图像切换:

setInterval(function() {
  $('#slideshow > div:first')
    .fadeOut(0)
    .next()
    .fadeIn(1000)
    .end()
    .appendTo('#slideshow');
}, 7000);

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div id="slideshow" name="slideshow" class="slideshow">
  <div>
    <img src='{ROOT}img/Camerashop24/slide1.jpg' alt="slide-1" class="slide">
  </div>
  <div>
    <img src='{ROOT}img/Camerashop24/slide2.jpg' alt="slide-2" class="slide">
  </div>
  <div>
    <img src='{ROOT}img/Camerashop24/slide3.jpg' alt="slide-3" class="slide">
  </div>
  <div>
    <img src='{ROOT}img/Camerashop24/slide4.jpg' alt="slide-4" class="slide">
  </div>
</div>

但是，当幻灯片发生变化时，幻灯片显示在下拉菜单上方，直到完全加载为止。然后它再次回到菜单后面。菜单的 z-index 为 100，幻灯片的 z-index 为 10。如果需要，我可以提供菜单的 css，但这是一个很长的列表。

为什么切换时幻灯片显示在菜单上方？

Answer 1

使用此代码幻灯片工作正常......

var myIndex = 0;
carousel();

function carousel() {
    var i;
    var x = document.getElementsByClassName("mySlides");
    for (i = 0; i < x.length; i++) {
       x[i].style.display = "none";  
    }
    myIndex++;
    if (myIndex > x.length) {myIndex = 1}    
    x[myIndex-1].style.display = "block";  
    setTimeout(carousel, 2000); // Change image every 2 seconds
}

<div id="slideshow" name="slideshow" class="slideshow">
     <img class="mySlides" src='{ROOT}img/Camerashop24/slide1.jpg' alt="slide-1" class="slide">
     <img class="mySlides" src='{ROOT}img/Camerashop24/slide2.jpg' alt="slide-2" class="slide">
      <img class="mySlides" src='{ROOT}img/Camerashop24/slide3.jpg' alt="slide-3" class="slide">
        <img class="mySlides" src='{ROOT}img/Camerashop24/slide4.jpg' alt="slide-4" class="slide">
</div>