导航栏不折叠

Question

我将这些放在标题中，而不是放在正文中，因为它说引导程序需要jQuery才能运行：

<script   src="https://code.jquery.com/jquery-3.1.0.min.js"   integrity="sha256-cCueBR6CsyA4/9szpPfrX3s49M9vUU5BgtiJj06wt/s="   crossorigin="anonymous"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js" integrity="sha384-Tc5IQib027qvyjSMfHjOMaLkfuWVxZxUPnCJA7l2mCWNIpG9mGCD8wGNIcPD7Txa" crossorigin="anonymous"></script> 
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.8.3/jquery.min.js"></script>

这是实际的导航栏部分。 我很确定有些东西丢失了，但是看不到我在做什么：

<nav class="navbar navbar-default navbar-fixed-top">
    <div class="container-fluid">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">     
            <button type="button" class="navbar-toggle collapsed navbar-right " data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" 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>
            </div>
          </button>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse navbar-right" id="bs-example-navbar-collapse-1">
            <div class="navbar-collapse collapse">
                 <ul class="nav navbar-nav">
                    <li id="button0"><a href="#landing-page">Home</a></li>
                    <li id="button1"><a href="#what-we-do">What We Do</a></li>
                    <li  id="button2"><a href="#contact">Contact Us</a></li>
                    </div>
                 </ul>
            </div>
        </div><!-- /.navbar-collapse -->
    </div><!-- /.container-fluid -->
</nav>

Answer 1

HTML一些不需要的div更改HTML

<nav class="navbar navbar-default navbar-fixed-top">
        <div class="container-fluid">
            <!-- Brand and toggle get grouped for better mobile display -->
            <div class="navbar-header">
                <button type="button" class="navbar-toggle collapsed navbar-right " data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" 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>
            </div>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse navbar-right" id="bs-example-navbar-collapse-1">
            <div class="navbar-collapse">
                <ul class="nav navbar-nav">
                    <li id="button0"><a href="#landing-page">Home</a></li>
                    <li id="button1"><a href="#what-we-do">What We Do</a></li>
                    <li id="button2"><a href="#contact">Contact Us</a></li>

                </ul>
            </div>
        </div>

    </nav>

https://jsfiddle.net/o6p71fko/1/

Answer 2

1. 不要两次包含jQuery（您的版本为3.1.0和1.8.3）
2. 包括引导CSS
3. 包括bootstrap-collapse插件： https : //getbootstrap.com/javascript/#collapse

Answer 3

您添加了两个带有navbar-collapse折叠类的div，在ul之前删除了内部的一个。

观看演示

  <link rel="stylesheet" href="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script> <script src="http://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> <nav class="navbar navbar-default navbar-fixed-top"> <div class="container-fluid"> <!-- Brand and toggle get grouped for better mobile display --> <div class="navbar-header"> <button type="button" class="navbar-toggle collapsed navbar-right " data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" 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> </div> <!-- Collect the nav links, forms, and other content for toggling --> <div class="collapse navbar-collapse navbar-right" id="bs-example-navbar-collapse-1"> <ul class="nav navbar-nav"> <li id="button0"><a href="#landing-page">Home</a></li> <li id="button1"><a href="#what-we-do">What We Do</a></li> <li id="button2"><a href="#contact">Contact Us</a></li> </ul> </div><!-- /.container-fluid --> </nav> 

Answer 4

删除第17行的div及其结束标记。 另外，删除第11和22行上多余的关闭div。

<nav class="navbar navbar-default navbar-fixed-top">

    <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">     
            <button type="button" class="navbar-toggle collapsed navbar-right " data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" 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>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse navbar-right" id="bs-example-navbar-collapse-1">

            <ul class="nav navbar-nav">
                <li id="button0"><a href="#landing-page">Home</a></li>
                <li id="button1"><a href="#what-we-do">What We Do</a></li>
                <li  id="button2"><a href="#contact">Contact Us</a></li>
            </ul>

        </div><!-- /.navbar-collapse -->

    </div><!-- /.container-fluid -->

</nav>