为什么.head-logo的效果无法实现，但是使用#head-logo时效果可以实现？
来源：2-1 页面头部的制作（一）
qq_鸭绿桥第一帅哥_0
2019-04-04 13:54:22
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,
initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0, user-scalable=no" />
<link rel="stylesheet" type="text/css" href="bootstrap-3.3.7-dist/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="css/layout.css">
<link rel="stylesheet" type="text/css" href="css/css.css">
<script type="text/javascript" src="js/jquery-3.3.1.js"></script>
<script type="text/javascript" src="bootstrap-3.3.7-dist/js/bootstrap.js"></script>
<title>c</title>
</head>
<body>
<section id="page-head">
<div class="container">
<nav class="navbar navbar-default">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="head-logo"><img src="images/index_05.png"></div>
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav navbar-right">
<li class="active"><a href="#">首页</a></li>
<li><a href="#">产品</a></li>
<li><a href="#">关于</a></li>
</ul>
<div class="nav-tell">4007-888888</div>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
</div>
</section>
</body>
</html>
@charset "utf-8";
#page-head{
width: 100%;
height: 100px;
background: #f9f9f9;
position: fixed;
top: 0;
z-index: 99;
}
#page-head+*{
margin-top: 100px;
}
.navbar-default{
border: 0;
margin-bottom: 0;
}
.head-logo{
float: left;
margin-top: 15px;
}写回答
1回答
-
同学，你好。你这里面没有id为head-logo的元素，只有class为head-logo的元素，如果你设置
#head-logo{
float: left;
margin-top: 15px;
}
其实跟什么都没写是一样的，不是写它起作用，你可以试一下。
如果帮助到了你，欢迎采纳！
祝学习愉快！
0
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