<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>div固定在浏览器顶部</title>
<script src="http://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>
<style>
.wrap {
margin:0 auto;
border:1px solid #ccc;
width:1000px;
height:500px;
margin-top:200px;
margin-bottom:1000px;
position:relative;
}
.left {
width:100px;
height:200px;
margin:5em;
border:1px solid #ccc;
z-index:999;
position:absolute;
}
</style>
</head>
<body>
<div class="wrap">
<div class="left">
往下试看效果
</div>
</div>
<script>
$(document).ready(function() {
var scroh = $(".wrap .left").offset().top;
$(window).scroll(function() {
if (scroh < $(window).scrollTop()) {
//获取div距离
var left = $(".wrap .left").offset().left;
$(".wrap").css({
'position': 'relative'
});
$(".wrap .left").css({
'position': "fixed",
'left': 'left' - $(".wrap .left").css('width'),
'top': '0',
'margin-top': '0'
});
} else {
$(".wrap .left").css({
'position': "relative",
'margin': '5em'
});
}
});
});
</script>
</body>
<html>
<head>
<meta charset="utf-8">
<title>div固定在浏览器顶部</title>
<script src="http://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>
<style>
.wrap {
margin:0 auto;
border:1px solid #ccc;
width:1000px;
height:500px;
margin-top:200px;
margin-bottom:1000px;
position:relative;
}
.left {
width:100px;
height:200px;
margin:5em;
border:1px solid #ccc;
z-index:999;
position:absolute;
}
</style>
</head>
<body>
<div class="wrap">
<div class="left">
往下试看效果
</div>
</div>
<script>
$(document).ready(function() {
var scroh = $(".wrap .left").offset().top;
$(window).scroll(function() {
if (scroh < $(window).scrollTop()) {
//获取div距离
var left = $(".wrap .left").offset().left;
$(".wrap").css({
'position': 'relative'
});
$(".wrap .left").css({
'position': "fixed",
'left': 'left' - $(".wrap .left").css('width'),
'top': '0',
'margin-top': '0'
});
} else {
$(".wrap .left").css({
'position': "relative",
'margin': '5em'
});
}
});
});
</script>
</body>
</html>
