我使用 Bootstrap 创建了这个页面。当我将页面拖动到更窄的尺寸时，导航栏消失并被一个按钮取代。这个按钮的想法是，一旦点击它就会打开导航选项。这最后一点没有发生，我似乎无法找到解决办法。我一直在浏览网页多年但没有成功。请帮忙。
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<title>Grid System 3</title>
<!-- Bootstrap -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- 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="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
<style>
.box {
border: 1px solid grey;
background-color: #D3D3D3;
}
</style>
</head>
<body>
<div class="navbar navbar-inverse">
<div class="container">
<div class="navbar-header">
<a href="" class="navbar-brand">My Website</a>
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<div class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li><a href="">Page 1</a></li>
<li><a href="">Page 2</a></li>
<li><a href="">Page 3</a></li>
</ul>
</div>
</div>
</div>
<h1>Hello, world!</h1>
<div class="container">
<div class="row">
<div class="col-md-4 box">.col-md-4</div>
<div class="col-md-4 box">.col-md-4</div>
<div class="col-md-4 box">.col-md-4</div>
</div>
</div>
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.min.js"></script>
</body>
</html>
最佳答案
要查找的最明显的事情是您有一个名为 js 的文件夹，其中包含 bootstrap min js 并称为 bootstrap.min.js 并且因为您是从 CDN 调用 jQuery，所以您需要有一个事件的连接到网络，而不是仅在本地服务器上工作。
您还需要在导航栏折叠上放置一个 id 并将其作为按钮的目标，因为页面中有超过 1 个类为“navbar”的元素。
如下:
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- The above 3 meta tags *must* come first in the head; any other head content must come *after* these tags -->
<title>Grid System 3</title>
<!-- Bootstrap -->
<link href="css/bootstrap.min.css" rel="stylesheet">
<!-- 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="https://oss.maxcdn.com/html5shiv/3.7.2/html5shiv.min.js"></script>
<script src="https://oss.maxcdn.com/respond/1.4.2/respond.min.js"></script>
<![endif]-->
<style>
.box {
border: 1px solid grey;
background-color: #D3D3D3;
}
</style>
</head>
<body>
<div class="navbar navbar-inverse">
<div class="container">
<div class="navbar-header">
<a href="" class="navbar-brand">My Website</a>
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<div id="navbar" class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li><a href="">Page 1</a></li>
<li><a href="">Page 2</a></li>
<li><a href="">Page 3</a></li>
</ul>
</div>
</div>
</div>
<h1>Hello, world!</h1>
<div class="container">
<div class="row">
<div class="col-md-4 box">.col-md-4</div>
<div class="col-md-4 box">.col-md-4</div>
<div class="col-md-4 box">.col-md-4</div>
</div>
</div>
<!-- jQuery (necessary for Bootstrap's JavaScript plugins) -->
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.3/jquery.min.js"></script>
<!-- Include all compiled plugins (below), or include individual files as needed -->
<script src="js/bootstrap.min.js"></script>
</body>
</html>
我已经对其进行了测试，它按预期工作。
关于javascript - Bootstrap 按钮切换不打开 LI，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/35505119/