前端如何实现滚动到某个位置，div固定，下方覆盖该div？

Question

类似华为这个网站的效果：

https://consumer.huawei.com/cn/phones/mate-x-s/

Answer 1

sticky 定位，z-index 较低就完事了。

Sticky Practice - CodePen

.front {
  width: 100%;
  height: 80vh;
}

.sticky {
  position: sticky;
  z-index: -1;
  top: 0;
  width: 100%;
  height: 80vh;
  background: orange;
  /* 画个 border 表现出它 sticky */
  border: 32px solid #666;
  box-sizing: border-box;
}

.back {
  width: 100%;
  height: 200vh;
  background: #000;
}

<div class="front"></div>
<div class="sticky"></div>
<div class="back"></div>

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参阅：sticky - position - CSS | MDN