记笔记,免忘记!
借鉴网上的
HMTL:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>标题</title>
</head>
<body>
<header>
</header>
<section style="height: 1500px;background-color: #f0f0f0">
</section>
<footer>
</footer>
</body>
</html>
JS:
window.onscroll = function () {
var a = document.documentElement.scrollTop || document.body.scrollTop;//滚动条y轴上的距离
var b = document.documentElement.clientHeight || document.body.clientHeight;//可视区域的高度
var c = document.documentElement.scrollHeight || document.body.scrollHeight;//可视化的高度与溢出的距离(总高度)
if(a > 0){
document.querySelector('#header').style.top = 0 + 'px';
}else{
document.querySelector('#header').style.top = 36 + 'px';
};
};