html - Bootstrap-4 垂直导航栏卡住折叠

Question

我才刚刚开始掌握 Bootstrap 。

我正在尝试在用户使用 bootstrap 4 滚动过整页“介绍”后在页面左侧创建一个垂直导航栏。下面的代码在页面左侧生成导航栏，但是有一个问题

• 导航栏保持折叠状态，即使在再次调整窗口大小后也是如此

为什么代码会导致导航栏开始关闭？

谢谢，杰夫

<header id="home" class="jumbotron h-100vw w-100vw">
...
</header>
<div class="container-fluid">
<div class="row">
    <div class="col-md-2">
        <nav class="navbar navbar-expand-md navbar-light">

            <a class="navbar-brand" href="#home">
                <img src="img/logo.png" class="img-fluid" alt="Home">
            </a>

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

            <div class="collapse navbar-collapse-md flex-column" id="nav-content">
                <ul class="navbar-nav">
                    <li class="nav-item">
                        <a class="nav-link" href="#about"></a>About Me</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#work">My Work</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#connect">Stay Connected</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#contact">Get In Touch</a>
                    </li>
                </ul>
            </div>
        </nav>
    </div>

    <main class="col-md-10">
        REST OF MY CONTENT ON THE RIGHT
    </main>
</div>

Answer 1

没有 navbar-collapse-md 类。将其更改为 navbar-collapse。

   <div class="collapse navbar-collapse flex-column" id="nav-content">
             <ul class="navbar-nav">
                    <li class="nav-item">
                        <a class="nav-link" href="#about"></a>About Me
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#work">My Work</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#connect">Stay Connected</a>
                    </li>
                    <li class="nav-item">
                        <a class="nav-link" href="#contact">Get In Touch</a>
                    </li>
             </ul>
   </div>