<!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;
}
div {
width: 100px;
height: 200px;
background-color: rgb(137, 137, 221);
position: absolute;
top: 200px;
left: 0;
}
body {
height: 2000px;
}
</style>
</head>
<body>
<div></div>
</body>
</html>
<script>
let odiv = document.querySelector("div");
let time = null;
</script>
<script src="缓冲运动.js"></script>
缓冲运动.js
function move(obj, target) {
clearInterval(time);
time =setInterval(function () {
let speed = (target - obj.offsetTop) / 10;
speed = speed > 0 ? Math.ceil(speed) : Math.floor(speed);
obj.style.top = obj.offsetTop + speed + "px";
if (obj.offsetLeft == target) {
clearInterval(time);
}
}, 50)
}
window.onscroll = function () {
let _top = document.body.onscrollTop || document.documentElement.scrollTop;
move(odiv, _top+50);
}