bilibili景深对焦效果
<!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>
* {
margin: 0;
padding: 0;
}
header {
height: 160px;
position: relative;
overflow: hidden;
}
header div {
width: 100%;
height: 100%;
position: absolute;
left: 0;
top: 0;
display: flex;
justify-content: center;
align-items: center;
--offset: 0px;
--blur: 2px;
}
header div img {
width: 110%;
height: 100%;
object-fit: cover;
transform: translate(var(--offset));
filter: blur(var(--blur));
}
</style>
</head>
<body>
<header>
<div><img src="https://assets.codepen.io/2002878/bilibili-autumn-1.png"></div>
<div><img src="https://assets.codepen.io/2002878/bilibili-autumn-2.png"></div>
<div><img src="https://assets.codepen.io/2002878/bilibili-autumn-3.png"></div>
<div><img src="https://assets.codepen.io/2002878/bilibili-autumn-4.png"></div>
<div><img src="https://assets.codepen.io/2002878/bilibili-autumn-5.png"></div>
<div><img src="https://assets.codepen.io/2002878/bilibili-autumn-6.png"></div>
</header>
</body>
<script>
const images = document.querySelectorAll('header>div>img');
console.log(images, images.entries())
document.querySelector('header').addEventListener('mousemove', function (e) {
let { clientX } = e;
let { outerWidth } = window;
let percentage = clientX / outerWidth;
let offset = 10 * percentage;
let blur = 20;
for (let [index, image] of images.entries()) {
offset *= 1.3;
let blurValue = Math.pow((index / images.length - percentage), 2) * blur;
console.log('index === ', index, offset, blurValue)
image.style.setProperty('--offset', `${offset}px`)
image.style.setProperty('--blur', `${blurValue}px`)
}
})
</script>
</html>
