`

顶部浮动

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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>顶部浮动的导航效果</title>
<style type="text/css">
    body,h1,ul{margin:0;}
    ul li{list-style-type:none;}
    #header{width:100%;border-top:solid 1px #ccc;border-bottom:solid 1px #ccc;text-align:center;}
    h1{padding:10px 0;color:#D74452;}
    .nav{width:1000px;background:#fff;margin:20px auto 0;border:solid 1px #ccc;zoom:1;border-radius:5px;box-shadow:0 1px 6px rgba(0,0,0,0.1);color:#D74452;}
    .nav_scroll{position:fixed;width:100%;margin:0;left:0;top:0;}
    .nav:after{content:"";display:block;height:0;clear:both;visibility:hidden;}
    .nav ul li{float:left;margin:0 20px;height:30px;line-height:30px;}
    .nav ul li a{cursor:pointer; }
    .nav ul li a:hover{text-decoration:underline;}
    h2{height:400px;line-height:400px;}
</style>
<script src="http://ajax.googleapis.com/ajax/libs/jquery/1.7.2/jquery.min.js" type="text/javascript"></script>
<script type="text/javascript">
    $(document).ready(function(){
                var topMain=$("#header").height()+20//是头部的高度加头部与nav导航之间的距离。
                var nav=$(".nav");
                $(window).scroll(function(){
                    if ($(window).scrollTop()>topMain){//如果滚动条顶部的距离大于topMain则就nav导航就添加类.nav_scroll,否则就移除。
                        nav.addClass("nav_scroll");
                    }
                    else
                    {
                        nav.removeClass("nav_scroll");
                    }
                });
    
        })
</script>
</head>
    
<body>
<div id="header"><h1>花瓣</h1></div><!--header-->
<div class="nav">
    <ul>
        <li><a>关注</a></li>
        <li><a>最新</a></li>
        <li><a>最热</a></li>
        <li><a>视频</a></li>
        <li><a>家居</a></li>
        <li><a>旅行</a></li>
    </ul>
</div><!--nav-->
<div style="background:#f9f9f9;color:#000;" id="cont">
    <h2>1</h2>
    <h2>2</h2>
    <h2>3</h2>
    <h2>4</h2>
    <h2>5</h2>
    <h2>6</h2>
    <h2>7</h2>
    <h2>8</h2>
    <h2>1</h2>
    <h2>2</h2>
    <h2>3</h2>
    <h2>4</h2>
    <h2>5</h2>
    <h2>6</h2>
    <h2>7</h2>
    <h2>8</h2>
    <h2>1</h2>
    <h2>2</h2>
    <h2>3</h2>
    <h2>4</h2>
    <h2>5</h2>
    <h2>6</h2>
    <h2>7</h2>
    <h2>8</h2>
    <h2>1</h2>
    <h2>2</h2>
    <h2>3</h2>
    <h2>4</h2>
    <h2>5</h2>
    <h2>6</h2>
    <h2>7</h2>
    <h2>8</h2>
    <h2>1</h2>
    <h2>2</h2>
    <h2>3</h2>
    <h2>4</h2>
    <h2>5</h2>
    <h2>6</h2>
    <h2>7</h2>
    <h2>8</h2>
</div>
</body>
</html>
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