<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<style>
.header {
position: fixed;
top: 0;
left: 0;
width: 100%;
background: #cc5350;
color:#fff;
z-index: 1000;
height: 200px;
overflow: hidden;
-webkit-transition: height 0.3s;
-moz-transition: height 0.3s;
transition: height 0.3s;
text-align:center;
line-height:160px;
}
.header.shrink {
height: 100px;
line-height:80px;
}
.header h1
{
font-size:30px;
font-weight:normal;
-webkit-transition: all 0.3s;
-moz-transition: all 0.3s;
transition: all 0.3s;
}
.header.shrink h1
{
font-size:24px;
-webkit-transition: all 0.3s;
-moz-transition: all 0.3s;
transition: all 0.3s;
}
.content
{
height:2000px;
/*just to get the page to scroll*/
}
</style>
</head>
<body>
<div class="header">
<h1>动画固定标题（向下滚动网页查看效果）</h1>
</div>
<div class="content"> </div>
<script type="text/javascript" src="//repo.bfw.wiki/bfwrepo/js/jquery-3.2.1.min.js"></script>
<script>
$(function(){
var shrinkHeader = 300;
$(window).scroll(function() {
var scroll = getCurrentScroll();
if ( scroll >= shrinkHeader ) {
$('.header').addClass('shrink');
}
else {
$('.header').removeClass('shrink');
}
});
function getCurrentScroll() {
return window.pageYOffset || document.documentElement.scrollTop;
}
});
</script>
</body>
</html>
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