直接复制粘贴到自己 html 页面中查看效果，图片、图片路径自己修改
第一种效果：
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
padding: 0;
margin: 0;
}
div {
width: 100%;
height: 500px;
border-bottom: 2px solid red;
}
div:nth-child(3) {
background-image: url(bg1.jpg);
background-size: cover;
background-position: center;
}
</style>
</head>
<body>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<div></div>
<script>
const divEl = document.querySelector(`div:nth-child(3)`)
window.addEventListener("scroll", () => {
//getBoundingClientRect方法返回元素的大小及其相对于视口的位置
const top = divEl.getBoundingClientRect().top;
const bottom = divEl.getBoundingClientRect().bottom;
if (bottom >= 0 && top <= window.innerHeight) {
divEl.style.backgroundPosition = `center calc(50% - ${bottom / 2}px)`;
}
})
</script>
</body>
</html>
第二种效果：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Document</title>
<style>
* {
padding: 0;
margin: 0;
}
.box {
width: 100%;
height: 500px;
border-bottom: 2px solid red;
background-color: #CCC;
}
.box1Bg {
position: fixed;
width: 100%;
pointer-events: none;
background-image: url(bg3.jpg);
background-position: 50% 50%;
background-repeat: no-repeat;
background-size: cover;
background-color: rgba(0, 0, 0, 0);
height: 100%;
top: 0px;
z-index: -1;
}
.box:nth-child(1) {
color: white;
text-align: center;
font-size: 30px;
background-color: transparent;
}
.box:nth-child(4) {
color: white;
text-align: center;
font-size: 30px;
background-color: transparent;
}
</style>
</head>
<body>
<div class="box">
<span>啊撒大苏打实打实大苏打实打实大苏打上</span>
<div class="box1Bg"></div>
</div>
<div class="box"></div>
<div class="box"></div>
<div class="box">
<span>第四个内容</span>
<div style="background-image: none; position: relative;">
<div style="position: absolute; inset: 0px; clip: rect(-40px, 1912px, 617px, 0px);">
<div style="position:fixed;top:0;left:0;width:1912px;bottom:0;z-index:-1;pointer-events:none">
<div
style="position: absolute; width: 100%; pointer-events: none;
background-image: url(bg1.jpg); background-position: 50% 50%;
background-repeat: no-repeat;
background-size: cover;
background-color: rgba(0, 0, 0, 0); height: 100%; top: 0px;">
</div>
</div>
</div>
</div>
</div>
<div class="box"></div>
<div class="box"></div>
<div class="box"></div>
</body>
</html>
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