JS 实现DIV 滚动至顶部后固定
<!DOCTYPE HTML><html><head> ?<meta charset="UTF-8"> ?<title>DIV滚动至顶部后固定</title></head><body style="height:2000px;"><div style="height: 200px"></div><div id="nav_keleyi_com" style="position:relative;top:0;background:#00f;width:100px; height:100px"> ?Test Div</div><script type="text/javascript"> ?function menuFixed(id) { ???var obj = document.getElementById(id); ???var _getHeight = obj.offsetTop; ???window.onscroll = function () { ?????changePos(id, _getHeight); ???} ?} ?function changePos(id, height) { ???var obj = document.getElementById(id); ???var scrollTop = document.documentElement.scrollTop || document.body.scrollTop; ???if (scrollTop < height) { ?????obj.style.position = ‘relative‘; ???} else { ?????obj.style.position = ‘fixed‘; ???} ?} ?window.onload = function () { ???menuFixed(‘nav_keleyi_com‘); ?}</script></body>JS 实现DIV 滚动至顶部后固定
原文地址：https://www.cnblogs.com/acm-bingzi/p/div-fixed.html