Question

我的导航栏未在我的项目中扩展。为了排除故障，我确实做了一个新的简化项目，并且在那儿运行良好。因此，我不确定这是什么问题。这是无效的代码：

shopping = [ 'Garlic', 'Califlower', 'Peppper', 'Slat', 'Oil', 'Beer', 'Toilet Paper', 'Pizza' ]
if 'Mashrum' not in shopping:
    print('we missed Mashrum!')

因此，我将粘贴的nav元素复制到另一个文件中。使用几乎相同的代码：

<head>
    <meta charset="utf-8">
    <meta http-equiv = "X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width", initial-scale=1>

    <title> My Project 
    </title>

    <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.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>
    <script src="https://code.jquery.com/jquery-3.1.1.min.js" ></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/tether/1.4.0/js/tether.min.js" ></script>
</head>
<body>

<nav  class="navbar navbar-expand-md bg-light navbar-flex navbar-dark">
    <div class="container-fluid">
    <!-- 1) Brand -->
        <div class="navbar-brand"> 
            <a hreft="{% url 'dashboard' %}">
                <img src="logo.jpg" id="logo_sample" class="logo img-responsive navbar-padding navbar_top_padding pull-left" alt="Logo image">  
            </a>
        </div>


    <!-- 2) Toggle Button -->
        <button id="myButton" type="button" class="navbar-toggler align-self-center " data-target="#navbarNav" data-toggle="collapse" 
            aria-controls="navbarNav" 
            aria-expanded="false" 
            aria-label="Toggle navigation">

            <span class="navbar-toggler-icon"></span>
        </button>   

    <!-- 3) Collapsible List -->
        <section class="collapse navbar-collapse" id="navbarNav">       
            <div class="navbar-nav mr-auto">                
                <a class="nav-item nav-link" href="{% url 'accounts:login' %}"> Log in</a>

                <a class="nav-item nav-link" href="{% url 'accounts:signup' %}"> Sign up</a>

                <a class="nav-item nav-link" href="http://www.example.com/about">About Us</a>

                <a class="nav-item nav-link" href = "http://www.example.com/contact">Contact us</a>

            </div>
        </section>
    </div>
</nav>
...
</body>

但是，它在此文件中有效。导入是相同的，代码段是相同的，那么为什么会有行为上的差异？感谢您的帮助

bootsrap4导航栏在折叠时不会扩展

0 个答案: