<nav class = "navbar navbar-default">
<div class="container-fluid">
<div class="navbar-header">
<a href = "#" class="navbar-brand">Recipe Book</a>
</div>
<div class="collapse navbar-collapse">
<ul class="nav navbar-nav">
<li><a href="#">Recipes</a></li>
<li><a href="#">Shopping List</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li class="dropdown">
<a href="#" class = "dropdown-toggle" role="button">Manage<span class = 'caret'></span></a>
<ul class = "dropdown-menu">
<li> <a href = "#">Save Data</a></li>
<li> <a href = "#">Fetch Data</a></li>
</ul>
</li>
</ul>
</div>
</div>
</nav>
输出仅显示“食谱书”,其余数据未显示...我使用的是 Angular 8,并且 bootstrap.min.css 已添加到 angular.json 文件中...