console 命令行工具 X clear

console

let start = 0, during = 60;

const easeIn = function (t, b, c, d) {
    return c * (t /= d) * t + b;
}

const run = () => {
    let top = easeIn(start, 500, -500, during)

    start ++;
    document.querySelector('#outer').scrollTop = top;
    if (start <= during) {
        requestAnimationFrame(run);
    }
}

run();

// https://github.com/zhangxinxu/Tween;

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style>
        #outer {
            margin: 100px 50px;
            background: red;
            height: 200px;
            width: 500px;
            padding: 10px 50px;
            overflow: scroll;
        } 
        #inner {
            height: 1000px;
            width: 500px;
            background-color: #d0ffe3;
        }
    </style>
</head>
<body>
    <div id="outer">
        <div id="inner"></div>
    </div>
</body>
</html>

.class1 {
    height: 500px;
    width: 500px;
    margin: 10px;
    background: red;
}

body {
    overflow: auto;
}