标签：on() menu UNC 导航条 滚动 min pre charset window
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style>
*{
margin: 0;
padding: 0;
}
img{
display: block;
margin: 0 auto;
}
.menu.f{
position: fixed;
top: 0;
left: 50%;
margin-left: -800px;
}
</style>
<script src="../1.10.2.jquery.min.js"></script>
</head>
<body>
<img src="img/01.jpg" />
<img src="img/02.jpg" class="menu" />
<img src="img/03.jpg" />
</body>
<script>
$(window).scroll(function(){
// 获得滚动上去的距离
var st=$(document).scrollTop();
document.title=st;
if(st>194){
$(".menu").addClass(‘f‘);
}else{
$(‘.menu‘).removeClass(‘f‘);
}
})
</script>
</html>
标签：on() menu UNC 导航条 滚动 min pre charset window
原文地址：https://www.cnblogs.com/gxywb/p/9429875.html
