it can be realized by using positions:sticky, but the compatibility is too poor. The current idea is to use js to judge the height of the scroll bar in the area + fixed, but the specific implementation steps have not been clearly thought out, and it is rather confusing. I hope to find a demo or a more detailed train of thought
.write a demo, in jq. Please refer to
.<!DOCTYPE html>
<html>
<head>
<title>demo</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, maximum-scale=1.0, user-scalable=0;">
<style type="text/css">
* {
margin: 0;
padding: 0;
border: 0;
box-sizing: border-box;
}
header {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 50px;
line-height: 50px;
background: orange;
text-align: center;
}
header.active {
position: fixed;
top: 0;
left: 0;
}
div {
width: 100%;
height: 300px;
padding-top: 50px;
position: relative;
}
</style>
</head>
<body>
<div class="header">
<header>1</header>
</div>
<div class="header">
<header>2</header>
</div>
<div class="header">
<header>3</header>
</div>
<div></div>
<div class="header">
<header>4</header>
</div>
<div class="header">
<header>5</header>
</div>
<div class="header">
<header>6</header>
</div>
</body>
<script type="text/javascript" src="jquery-1.9.1.js"></script>
<script type="text/javascript">
$(function() {
$('header').each(function(index, event) {
$(this).css({ 'z-index': index + 1 });
});
$(document).scroll(function() {
$('.header').each(function(index, event) {
var _this = $(this).find('header');
if ($(window).scrollTop() - $(this).offset().top >= 0) {
$(_this).addClass('active');
} else {
$(_this).removeClass('active');
}
});
});
})
</script>
</html>