导航栏显示我的品牌,但不显示菜单项。Bootstrap 4 依赖项的顺序正确(Bootstrap 4 CSS -> Jquery -> Popper -> Bootstrap JS)。中引用的元视点<head>
。
HTML:
<nav class="navbar navbar-light bg-faded">
<a class="navbar-brand" onclick="goBack()">
<img src="icon.jpg" width="30" height="30" class="d-inline-block align-top" alt="">
Back to Course
</a>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
</div>
</nav>
CSS:
@font-face {
font-family: Helvetica;
src: url(HelveticaNeue BlackCond.ttf);
}
@media (min-width: 992px) {
.navbar-nav li a { line-height: 80px; }
}
@media (max-width: 991px) {
.navbar-brand { float: none; }
}
.navbar-brand {
font-family: 'Helvetica';
font-weight: 500;
}
.container {
padding-top: 2em;
}
那是因为navbar-expand-*
您的代码中缺少该类。
我navbar-expand-md
在下面的代码片段中添加了。此类在中等 ( md
) 或更大的屏幕上展开导航栏(从默认折叠状态开始)。
如果将其更改为navbar-expand-lg
,则扩展将从大 ( lg
) 屏幕等开始。
如果您希望您的导航栏项目永久扩展,即在所有屏幕尺寸上,请使用navbar-expand
该类。
您还需要一个切换器,以便在导航栏折叠时打开和关闭导航栏项目。您的代码中目前也缺少该切换器。
单击下面的“运行代码片段”并展开到整页进行测试:
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
<nav class="navbar navbar-expand-md navbar-light bg-faded">
<a class="navbar-brand" onclick="goBack()">
<img src="https://placehold.it/30" width="30" height="30" class="d-inline-block align-top" alt="">
Back to Course
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
</div>
</nav>
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