position: sticky 修改吸顶样式
<div id="parent">
<br /> <br /> <br /> <br />
<div class="myElement">Hello!</div>
</div>
#parent {
height: 2000px;
}
.myElement {
position: sticky;
top: -1px;
}
/* styles for when the header is in sticky mode */
.myElement.is-pinned {
color: red;
}
const el = document.querySelector(".myElement")
const observer = new IntersectionObserver(
([e]) => e.target.classList.toggle("is-pinned", e.intersectionRatio < 1),
{ threshold: [1] }
);
observer.observe(el);