导航栏切换器不显示折叠的链接[重复]答案

【问题标题】：navbar toggler not showing collapsed links [duplicate]导航栏切换器不显示折叠的链接[重复]
【发布时间】：2020-07-20 10:10:40
【问题描述】：

在我的container-fluid cont 下，我正在使用引导程序编写我的自定义导航栏。

问题是当我点击切换器（汉堡）时什么都没有显示。相反，我希望当我以移动设备大小查看它时，它会折叠，当我点击切换器时它应该显示ul 链接列表。我可以改变什么？

<!-- NAV BAR -->
<nav class="navbar fixed-top navbar-expand-sm navbar-custom navbar-light">
    <a class="navbar-brand js-scroll-trigger" href="index.html"><img src="images/logo.png" height="50px" width="auto"></a>

    <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarCustom" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>

    <div class="collapse navbar-collapse" id="navbarCustom">
        <ul class="navbar-nav mr-auto mt-2 mt-lg-0">
            <li class="nav-item active samecolor">
                <a class="nav-link" href="#home">HOME</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#orari">ORARI</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#luogo">DOVE SIAMO</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="about.hmtl">CHI SIAMO</a>
            </li>
        </ul>
    </div>  
</nav>

这些是我在 css 方面所做的一些更改：

/*CHANGING SOME BOOTS TRAP NAV*/
.navbar-custom { 
    background-color: #F5D236; 
} 

.navbar-custom .navbar-nav .nav-link {
    color: #223D94;
}

/* change the color of active or hovered links */
.navbar-custom .nav-item.active .nav-link,
.navbar-custom .nav-item:hover .nav-link {
    color: #223D94;
}

.navbar-custom .dropdown-item {
    color: #223D94;
}

【问题讨论】：

标签： jquery html css bootstrap-4 navbar

【解决方案1】：

我忘了添加 JS 文件

<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>

https://getbootstrap.com/docs/4.3/getting-started/introduction/

【讨论】：