请问下为什么768下导航按钮无效
<!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>Bootstrap 实战项目</title> <link href="https://cdn.bootcss.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"> <link rel="stylesheet" type="text/css" href="css/layout.css"> </head> <body> <!-- 头部 --> <header id="header"> <div class="container "> <nav class="navbar navbar-default"> <div class="container-fluid"> <!-- Brand and toggle get grouped for better mobile display --> <div class="navbar-header left"> <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 class="logo left">IMOOC</div> </div> <!-- Collect the nav links, forms, and other content for toggling --> <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1 left"> <ul class="nav navbar-nav"> <li class="active"> <a href="#">首页 </a> </li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">生日 <span class="caret"></span></a> <ul class="dropdown-menu"> <li class="left"> <h4>关系</h4> <a href="#">朋友</a> <a href="#">爱人</a> <a href="#">姐妹</a> </li> <li class="left"> <h4>风味</h4> <a href="#">巧克力</a> <a href="#">水果</a> </li> </ul> </li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">婚礼 <span class="caret"></span></a> <ul class="dropdown-menu"> <li class="left"> <h4>关系</h4> <a href="#">朋友</a> <a href="#">爱人</a> <a href="#">姐妹</a> </li> <li class="left"> <h4>风味</h4> <a href="#">巧克力</a> <a href="#">水果</a> </li> <li class="left"> <h4>主旋律</h4> <a href="#">心形</a> <a href="#">卡通</a> </li> </ul> </li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">专用 <span class="caret"></span></a> <ul class="dropdown-menu"> <li class="left"> <h4>关系</h4> <a href="#">朋友</a> <a href="#">爱人</a> <a href="#">姐妹</a> </li> <li class="left"> <h4>风味</h4> <a href="#">巧克力</a> <a href="#">水果</a> </li> </ul> </li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">商铺 <span class="caret"></span></a> <ul class="dropdown-menu"> <li class="left"> <h4>关系</h4> <a href="#">朋友</a> <a href="#">爱人</a> <a href="#">姐妹</a> </li> <li class="left"> <h4>风味</h4> <a href="#">巧克力</a> <a href="#">水果</a> </li> </ul> </li> </ul> </div><!-- /.navbar-collapse --> <div class="right"> <button type="button" class="btn btn-default" data-container="body" data-toggle="popover" data-placement="bottom" data-content="Vivamus sagittis lacus vel augue laoreet rutrum faucibus."> <span class="glyphicon glyphicon-search icon" ></span> </button> <span class="glyphicon glyphicon-user icon"></span> <span class="glyphicon glyphicon-shopping-cart icon"></span> </div> </div><!-- /.container-fluid --> </nav> </div> </header> <!-- banner区 --> <!-- <section> <div class="banner"> <div class="container"> <div class="row"> <div class="col-md-7 col-sm-7 col-xs-7"> <span class="text-1">IMOOC </span> <span class="text-2">蛋糕</span> <div class="text-3"> 特别的日子,特别的你 </div> <button type="button" class="but">SHOP NOW</button> </div> <div class="col-md-5 col-sm-5 col-xs-5"> <img src="images/2.png" alt=""> </div> </div> </div> </div> </section> --> <!-- gallery区 --> <!-- <section> <div class="gallery"> <div class="container"> <div class="row"> </div> </div> </section> --> <script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script> <script src="https://cdn.bootcss.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> </body> </html>
#header{ background-color: #5D4B33; height: 60px; } .navbar-default{ border: 0; line-height: 60px; } .container-fluid{ background-color: #5D4B33; } .logo{ font-size: 36px; color: #fff; } .navbar-nav{ margin-left: 20px; } .navbar-default .navbar-nav >li { margin-left: 5px; width:80px; text-align: center; color: #fff; /* border-left: 1px solid ; */ } .navbar-default .navbar-nav > li > a{ height: 60px; color: #fff; margin: 0; line-height:60px; padding: 0; } .navbar-default .navbar-nav > .active > a, .navbar-default .navbar-nav > .active > a:hover, .navbar-default .navbar-nav > .active > a:focus{ background-color: orange; color: #fff; height: 58px; } .dropdown-menu{ width: 600px; height: 250px; } .dropdown-menu .left{ float: left; padding: 20px 30px; color: #5D4B33; margin-right: 60px; } .dropdown-menu .left h4{ color: orange; } .dropdown-menu .left a{ padding: 0; margin: 20px 0; color: #5D4B33; } .navbar-default .navbar-nav>.open>a, .navbar-default .navbar-nav>.open>a:focus, .navbar-default .navbar-nav>.open>a:hover{ background-color: orange; color: #fff; height: 58px; } .navbar-default .navbar-nav > li > a:hover{ background-color: orange; color: #fff; transition: all .3s; } .dropdown-menu>li>a:hover{ background-color: #fff; color: #F07818; transition: all .3s; } .navbar-default .navbar-collapse{ float: left; } .left{ float: left; } .right{ float: right; } .icon{ color: #fff; } .navbar-default .navbar-toggle{ background-color: orange; border: 0; left: 30px; top: 5px; color: #fff; } .navbar-default .navbar-toggle .icon-bar{ background-color: #fff; } /* 屏幕小于 768px */ @media (max-width: 768px){ .logo{ font-size: 24px; } .right{ position: relative; top: 0; right: 0; } }
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