Html 当页面位于“汉堡”时，汉堡下拉菜单不工作；流动电话；桌面上的大小
当我将页面缩小到手机大小时，我的汉堡按钮不起作用。其他的一切似乎都是正确的，我已经检查了很多次代码，它似乎是正确的。在这一点上，我不确定是我下面的脚本代码禁用了下拉菜单还是什么Html 当页面位于“汉堡”时，汉堡下拉菜单不工作；流动电话；桌面上的大小,html,css,twitter-bootstrap,Html,Css,Twitter Bootstrap,当我将页面缩小到手机大小时，我的汉堡按钮不起作用。其他的一切似乎都是正确的，我已经检查了很多次代码，它似乎是正确的。在这一点上，我不确定是我下面的脚本代码禁用了下拉菜单还是什么 <!DOCTYPE html> <html> <head> <title>Image Gallery</title> <link rel="stylesheet" type="text/css" href="https://maxcdn.b
<!DOCTYPE html>
<html>
<head>
<title>Image Gallery</title>
<link rel="stylesheet" type="text/css" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="gallery.css">
</head>
<body>
<nav class="navbar navbar-inverse navbar-fixed-top">
<div class="container">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" date-target="#bs-nav-demo" 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 href="#" class="navbar-brand"><span class="glyphicon glyphicon-picture" aria-hidden="true"></span> IMAGES</a>
</div>
<div class="collapse navbar-collapse" id="bs-nav-demo-1">
<ul class="nav navbar-nav">
<li><a href="#">About</a></li>
<li><a href="#">Contact</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Sign Up</a></li>
<li><a href="#">Login</a></li>
</ul>
</div>
</div>
</nav>
<div class="container">
<div class="jumbotron">
<h1><span class="fas fa-camera-retro"></span> The Image Gallery</h1>
<p>Wonderful pictures at your disposal!</p>
</div>
<div class="row">
<div class="col-lg-4 col-sm-6" >
<div class="thumbnail">
<img src="http://i.imgur.com/qK42fUu.jpg">
</div>
</div>
<div class="col-lg-4 col-sm-6">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1435771112039-1e5b2bcad966?dpr=2&fit=crop&fm=jpg&h=825&q=50&w=1450">
</div>
</div>
<div class="col-lg-4 col-sm-6">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1442406964439-e46ab8eff7c4?dpr=2&fit=crop&fm=jpg&h=825&q=50&w=1450">
</div>
</div>
<div class="col-lg-4 col-sm-6">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1439524970634-649c37a69e5c?ixlib=rb-0.3.5&q=80&fm=jpg&crop=entropy&w=1450&h=825&fit=crop&s=bfda9916c885869b43b70738693428d9">
</div>
</div>
<div class="col-lg-4 col-sm-6">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1444090542259-0af8fa96557e?dpr=2&fit=crop&fm=jpg&h=825&q=50&w=1450">
</div>
</div>
<div class="col-lg-4 col-sm-6">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1434543177303-ef2cc7707e0d?dpr=2&fit=crop&fm=jpg&h=825&q=50&w=1450">
</div>
</div>
<div class="col-lg-4 col-sm-6">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1436262513933-a0b06755c784?dpr=2&fit=crop&fm=jpg&h=825&q=50&w=1450">
</div>
</div>
<div class="col-lg-4 col-sm-6">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1439396087961-98bc12c21176?dpr=2&fit=crop&fm=jpg&h=825&q=50&w=1450">
</div>
</div>
<div class="col-lg-4 col-sm-6">
<div class="thumbnail">
<img src="https://images.unsplash.com/photo-1439694458393-78ecf14da7f9?dpr=2&fit=crop&fm=jpg&h=825&q=50&w=1450">
</div>
</div>
</div>
</div>
<script defer src="https://use.fontawesome.com/releases/v5.0.6/js/all.js"></script>
<script src="https://code.jquery.com/jquery-3.3.1.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
</body>
</html>
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