4-10固定定位

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四、固定定位
固定定位就是相对浏览器窗口定位。无论页面如何滚动，这个盒子显示的位置不变（返回顶部按钮、导航栏）
固定定位会脱离标准文档流。
 
 
p{
width: 100px;
height: 100px;
background-color: orange;
position: fixed;
top: 100px;
left: 100px;
}
 
4.1 固定定位的用途：返回顶部按钮
.backtop{
position: fixed;
bottom: 100px;
right: 30px;
width: 60px;
height: 60px;
background-color: gray;
text-align: center;
line-height:30px;
color:white;
text-decoration: none;
}
<a class="backtop">返回<br />顶部</a>
<img src="images/2.jpg" alt="" />
<img src="images/2.jpg" alt="" />
<img src="images/2.jpg" alt="" />
<img src="images/2.jpg" alt="" />
 
 
 
 
 
 
 
4.2 固定定位的用途：顶部导航条的固定
 
 
 * {
            margin: 0;
            padding: 0;
        }
        
        .nav {
            position: fixed;
            top: 0;
            left: 0;
            width: 100%;
            height: 60px;
            background-color: #333;
            z-index: 99999999;
        }
        
        .inner_c {
            width: 1000px;
            height: 60px;
            margin: 0 auto;
        }
        
        .inner_c ul {
            list-style: none;
        }
        
        .inner_c ul li {
            float: left;
            width: 100px;
            height: 60px;
            text-align: center;
            line-height: 60px;
        }
        
        .inner_c ul li a {
            display: block;
            width: 100px;
            height: 60px;
            color: white;
            text-decoration: none;
        }
        
        .inner_c ul li a:hover {
            background-color: gold;
        }
 <div class="nav">
        <div class="inner_c">
            <ul>
                <li><a href="#">网页栏目</a></li>
                <li><a href="#">网页栏目</a></li>
                <li><a href="#">网页栏目</a></li>
                <li><a href="#">网页栏目</a></li>
                <li><a href="#">网页栏目</a></li>
                <li><a href="#">网页栏目</a></li>
                <li><a href="#">网页栏目</a></li>
                <li><a href="#">网页栏目</a></li>
                <li><a href="#">网页栏目</a></li>
                <li><a href="#">网页栏目</a></li>
            </ul>
        </div>
    </div>
 
    <img src="images/2.jpg" alt="" />
    <img src="images/2.jpg" alt="" />
    <img src="images/2.jpg" alt="" />
    <img src="images/2.jpg" alt="" />
    <img src="images/2.jpg" alt="" />
    <img src="images/2.jpg" alt="" />
    <img src="images/2.jpg" alt="" />
    <img src="images/2.jpg" alt="" />
    <img src="images/2.jpg" alt="" />
    <img src="images/2.jpg" alt="" />
    <img src="images/2.jpg" alt="" />

<!DOCTYPE html><html lang="en"><head>    <meta charset="UTF-8">    <title>Document</title>    <style>        p {            width: 100px;            height: 100px;            background-color: orange;            position: fixed;            top: 100px;            left: 100px;        }    </style></head><body>    <p>阿萨德</p>    <img src="images/0103-large.jpg" alt=""></body></html>

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