<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title>防騰訊固定導航欄</title>
<style type="text/css">
*{margin:0;padding:0;}
.main{
width: 1000px;
margin:0 auto;
/*margin-top: 20px;*/
}
</style>
<script type="text/javascript" src="jquery-1.11.1.min.js"></script>
</head>
<body>
<div class="top">
<img src="images/top.png"/>
</div>
<div class="nav">
<img src="images/nav.png"/>
</div>
<div class="main">
<img src="images/main.png"/>
</div>
</body>
</html>
<script type="text/javascript">
$(window).scroll(function(){
//var tHeight =parseInt($(".top").css("height")) ;
var tHeight =$(".top").height();
var scrollTop = $(document).scrollTop();
if(scrollTop>tHeight){
$(".nav").css({"position":"fixed","top":0})
}else{
$(".nav").css({"position":"static"})
}
})
</script>
寫的不好,還請多指教!