导航栏中的引导下拉菜单未打开
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【中文标题】导航栏中的引导下拉菜单未打开【英文标题】：Bootstraps dropdown-menu in navbar does not open 【发布时间】：2018-01-04 19:14:24 【问题描述】：我的 navbar 中的下拉菜单要么不打开（如果我省略 open），要么一直保持打开状态（当我像在下面的版本中那样添加 open 时）。即使我省略了打开，它怎么能打开，或者我怎样才能让它再次关闭？ （那里有 jQuery 和 bootstrapcdn 的链接）：
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<body data-spy="scroll" data-target=".navbar">
<!--navbar starts here-->
<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
<div class="container-fluid">
<div class="navbar-header">
<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>
<a class="navbar-brand" href="#">
<img src="...">
</a>
<div class="projectName">
<a href="#">ДЖУЛИН</a>
</div>
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav navbar-right">
<li class="active"> <a href="#home"> HOME </a> </li>
<li class="dropdown open" role="presentation">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"> WORK <span class="caret"></span>
</a>
<ul class="dropdown-menu">
<li><a href="#work1" class="scroll-nav">Work 1</a></li>
<li><a href="#work2" class="scroll-nav">Work 2</a></li>
</ul>
</li>
<li class="active"> <a href="#about"> ABOUT </a> </li>
<li class="active"> <a href="#faq"> FAQ </a> </li>
<li class="active"> <a href="#contact"> CONTACT </a></li>
</ul>
</div> <!--collapse-->
</div> <!--header-->
</div> <!-- end nav container -->
</nav> <!-- end navbar-->【问题讨论】：
【参考方案1】：这里有一个解决方案https://jsfiddle.net/08xp0q92/
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<body data-spy="scroll" data-target=".navbar">
<!--navbar starts here-->
<nav class="navbar navbar-inverse navbar-fixed-top" role="navigation">
<div class="container-fluid">
<div class="navbar-header">
<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>
<a class="navbar-brand" href="#">
<img src="...">
</a>
<div class="projectName">
<a href="#">ДЖУЛИН</a>
</div>
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav navbar-right">
<li class="active"> <a href="#home"> HOME </a> </li>
<li class="dropdown open" role="presentation">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"> WORK <span class="caret"></span>
</a>
<ul class="dropdown-menu">
<li><a href="#work1" class="scroll-nav">Work 1</a></li>
<li><a href="#work2" class="scroll-nav">Work 2</a></li>
</ul>
</li>
<li class="active"> <a href="#about"> ABOUT </a> </li>
<li class="active"> <a href="#faq"> FAQ </a> </li>
<li class="active"> <a href="#contact"> CONTACT </a></li>
</ul>
</div> <!--collapse-->
</div> <!--header-->
</nav> <!-- end nav container -->
</body> <!-- end navbar-->您必须包含 bootstrap.js。
【讨论】：
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