当我在标题下面有一个"position: fixed;“标题和一个图像滑块"position: relative;”时该怎么办？

.title {
  position: fixed;
  z-index: 9999; /* 设置较高的值 */
}

.image-slider {
  position: relative;
  z-index: 1; /* 设置较低的值 */
}

<div class="container">
  <h1 class="title">标题</h1>
</div>

<div class="container">
  <div class="image-slider">图像滑块</div>
</div>

.container {
  position: relative; /* 设置容器为相对定位 */
}

.title {
  position: fixed;
}

.image-slider {
  position: relative;
}

window.addEventListener('scroll', function() {
  var title = document.querySelector('.title');
  var imageSlider = document.querySelector('.image-slider');
  
  var scrollTop = window.pageYOffset || document.documentElement.scrollTop;
  
  if (scrollTop > 0) {
    title.style.top = scrollTop + 'px';
    imageSlider.style.top = scrollTop + 'px';
  } else {
    title.style.top = '0';
    imageSlider.style.top = '0';
  }
});