为什么在宽带768到856之间会变成两行?

<!DOCTYPE html>
<html>
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>慕课网</title>
<meta name="keywords" content="" />
<meta name="description" content="" />
<link href="css/bootstrap.min.css" rel="stylesheet">
<link href="css/css2.css" rel="stylesheet" type="text/css">
<link href="css/layout2.css" rel="stylesheet" type="text/css">
<!-- HTML5 shim and Respond.js for IE8 support of HTML5 elements and media queries -->
<!-- WARNING: Respond.js doesn't work if you view the page via file:// -->
<!--[if lt IE 9]>
<script src="//cdn.bootcss.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="//cdn.bootcss.com/respond.js/1.4.2/respond.min.js"></script>
<![endif]-->
</head>
<body>
<header>
<nav class="navbar navbar-default">
<div class="container-fluid header-box">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header header-tit">
<button type="button" class="navbar-toggle collapsed btn" 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>
<a class="navbar-brand logo" href="#"><img src="images/index_05.png"></a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse header-main" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="on"><a href="#">首页 <span class="sr-only">(current)</span></a></li>
<li><a href="#">产品</a></li>
<li><a href="#">我们</a></li>
</ul>
<div class="nav navbar-nav navbar-right header-tell hidden-xs hidden-sm hidden-md">
4008-888888
</div>
</div><!-- /.navbar-collapse -->
</div><!-- /.container-fluid -->
</nav>
</header>
<script src="js/jquery.min.js" type="text/javascript"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.min.js"></script>
<script src="js/script.js"></script>
</body>
</html>
@charset "utf-8";
/* CSS Document */
header{
position: fixed;
width: 100%;
top: 0;
z-index: 99;
}
header+* {margin-top: 100px;}
.header-box{
height: 1rem;
}
.header-main ul li a{
height: 1rem;
line-height: 1rem;
padding: 0 0.3rem;
font-size: 0.16rem;
}
.header-main ul .on{
background:url(../images/index_02.png);
}
.header-main ul{
margin-left:0.8rem;
}
.header-main ul li{
margin:0 0.2rem;
}
.logo{
float:left;
height: 1rem;
}
.header-tit img{
margin-left: 1rem;
height: 0.7rem;
}
.header-tell{
background:url(../images/index_08.png) no-repeat center 48%;
width:1.86rem;
height:1rem;
line-height:1rem;
font-size:0.16rem;
color:#ef200d;
margin-right: 1rem;
padding-left: 0.5rem;
}
header .btn{
margin-top:0.3rem;
}
@media (max-width:767px){
.navbar-nav li{
height:50px;
width:100%;
line-height:50px;
text-align:center;
font-size:16px;
float:left;
color:#666666;
margin:0px;
}0
收起
正在回答 回答被采纳积分+1
2回答
好帮手慕糖
2018-08-24 17:48:51
你好,可在你的另一个问题中查看哦,http://class.imooc.com/course/qadetail/65487
祝学习愉快~
响应式开发与常用框架 2018
- 参与学习 人
- 提交作业 2198 份
- 解答问题 5012 个
如果你有web端基础,既想进阶,又想进军移动端开发,那就来吧,我们专题为你带来的课程有HTML5、CSS3、移动基础、响应式、bootstrap、less等,让你在前端道路上畅通无阻!
了解课程


恭喜解决一个难题,获得1积分~
来为老师/同学的回答评分吧
0 星