我在.header里设置完固定定位后，.nav发生了异位是为什么？

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<!DOCTYPE html>
<html>
 
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        ul {
             list-style: none;
        }
        .container {
            color: #ccc;
            text-align: center;
            font-size: 30px;
            width: 80%;
            margin: 0 auto;
            position: relative;
        }
        .header {
            background: black;
            /* overflow: hidden; */
            width: 100%;
            /* max-width: 1100px; */
            height: 100px; 
            position: fixed;
            /* top: 0;
            left: 0; */
        }
        .logo img {
            float: left;
        }
         .nav {
             overflow: hidden;
         }
        .nav ul {
            float: right;
        }
        .nav li {
            float: left;
            height: 100px;
            line-height: 100px;
            margin-right: 30px;
        }
        .booder img {
            width: 100%;
            display: block;
        }
       .footer {
        background: black;
        overflow: hidden;
        /*text-align: center;*/
       }
       .footer li{
        float: left;
        /*width: 100%;*/
        height: 100px;
        line-height: 100px;
        margin: 0 auto;
       }
    </style>
</head>
 
<body>
    <div class="container">
        <div class="header">
            <div class="logo">
                <img src="http://img1.sycdn.imooc.com/climg//58c0d2d900016ce303000100.png" alt="">
            </div>
            <div class="nav">
                <ul>
                    <li>课程</li>
                    <li>职业路径</li>
                    <li>实战</li>
                    <li>猿问</li>
                    <li>手记</li>
                </ul>
            </div>
        </div>
        <div class="booder">
            <img src="http://img1.sycdn.imooc.com/climg//58c0eda50001e12416000480.jpg" alt="">
            <img src="http://img1.sycdn.imooc.com/climg//58c0edb80001c9f216000480.jpg" alt="">
            <img src="http://img1.sycdn.imooc.com/climg//58c0edc9000100d516000480.jpg" alt="">
        </div>
        <div class="footer">
            <ul>
                <li>网站首页</li>
                <li>企业合作</li>
                <li>人才招聘</li>
                <li>联系我们</li>
                <li>常见问题</li>
                <li>友情链接</li>
            </ul>
        </div>
    </div>
</body>
 
</html>

Jack崔 2019-09-08

源自：CSS网页布局基础 2-5 经典的行布局（2）

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3回答

好帮手慕码 2019-09-09 09:45:56

同学你好！

请问是将header的宽度设置为80%的意思吗？如下所示：

这样是和父级一样的宽度，居中的效果就没有问题了。之前是因为header设置了定位，它的宽度100%就限制于父级宽度，所以会超出显示。

如果帮助到了你，欢迎采纳，祝学习愉快~

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提问者 Jack崔 2019-09-08 21:34:43

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<style>
* {
margin: 0;
padding: 0;
}
ul {
list-style: none;
}
.container {
color: #ccc;
text-align: center;
font-size: 30px;
width: 80%;
margin: 0 auto;
position: relative;
}
.header {
background: black;
/* width: 80%; */
/* 这个部分100%异位，而80%后就能恢复 */
width: 100%;
height: 100px;
position: fixed;
}
.logo img {
float: left;
}
.nav {
overflow: hidden;
}
.nav ul {
float: right;
}
.nav li {
float: left;
height: 100px;
line-height: 100px;
margin: 0 15px;
}
.booder img {
width: 100%;
display: block;
}
 
</style>
</head>
<body>
<div class="container">
<div class="header">
<div class="logo">
<img src="http://img1.sycdn.imooc.com/climg//58c0d2d900016ce303000100.png" alt="">
</div>
<div class="nav">
<ul>
<li>课程</li>
<li>职业路径</li>
<li>实战</li>
<li>猿问</li>
<li>手记</li>
</ul>
</div>
</div>
<div class="booder">
<img src="http://img1.sycdn.imooc.com/climg//58c0eda50001e12416000480.jpg" alt="">
<img src="http://img1.sycdn.imooc.com/climg//58c0edb80001c9f216000480.jpg" alt="">
<img src="http://img1.sycdn.imooc.com/climg//58c0edc9000100d516000480.jpg" alt="">
</div>
</div>
</body>
</html>