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>
正在回答 回答被采纳积分+1
在控制台查看元素的长度，最大div的宽度，和其它俩个模块的div的宽度就可以知道了吧！
@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;
}
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