这是W3Schools示例代码：

Question

我正在使用CodePen开发一个项目，我正在使用bootstrap创建一个导航栏。但由于某种原因，它是垂直显示而不是水平显示。即使我复制并粘贴了W3Schools示例和Bootstrap website中的代码。我不知道还能做什么。请帮忙。

这是W3Schools示例代码：

    <nav class="navbar navbar-default">
      <div class="container-fluid">
        <div class="navbar-header">
          <a class="navbar-brand" href="#">WebSiteName</a>
        </div>
        <ul class="nav navbar-nav">
          <li class="active"><a href="#">Home</a></li>
          <li><a href="#">Page 1</a></li>
          <li><a href="#">Page 2</a></li>
          <li><a href="#">Page 3</a></li>
        </ul>
      </div>

这是Bootstrap网站的示例代码：

    <nav class="navbar navbar-default">
      <div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
  <button type="button" class="navbar-toggle collapsed" 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>
  <a class="navbar-brand" href="#">Brand</a>
</div>

<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
  <ul class="nav navbar-nav">
    <li class="active"><a href="#">Link <span class="sr-only">(current)</span></a></li>
    <li><a href="#">Link</a></li>
    <li class="dropdown">
      <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
      <ul class="dropdown-menu">
        <li><a href="#">Action</a></li>
        <li><a href="#">Another action</a></li>
        <li><a href="#">Something else here</a></li>
        <li role="separator" class="divider"></li>
        <li><a href="#">Separated link</a></li>
        <li role="separator" class="divider"></li>
        <li><a href="#">One more separated link</a></li>
      </ul>
    </li>
  </ul>
  <form class="navbar-form navbar-left">
    <div class="form-group">
      <input type="text" class="form-control" placeholder="Search">
    </div>
    <button type="submit" class="btn btn-default">Submit</button>
  </form>
  <ul class="nav navbar-nav navbar-right">
    <li><a href="#">Link</a></li>
    <li class="dropdown">
      <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
      <ul class="dropdown-menu">
        <li><a href="#">Action</a></li>
        <li><a href="#">Another action</a></li>
        <li><a href="#">Something else here</a></li>
        <li role="separator" class="divider"></li>
        <li><a href="#">Separated link</a></li>
      </ul>
    </li>
  </ul>
</div><!-- /.navbar-collapse -->

两者都不起作用。是的，我已经对我的<link>和<script>代码进行了三次检查。

修改：here is my CodePen

Answer 1

首先，在评论中你使用bootstrap 3标记并且你链接到bootstrap 3和4删除bootstrap 4 css。然后你需要使用collapse navbar-collapse类的div，所以只需将其添加到id为nav的div中，如下所示：

<nav class="navbar navbar-inverse">
  <div class="container-fluid">

    <div class="navbar-header">
      <a class="navbar-brand" href="#about">
        <span style="font-family: 'Source Code Pro', Monospace; color:green"><i class="fa fa-code"></i>Ryan</span></a>
    </div>
    <div class="collapse navbar-collapse"  id="nav">
    <ul class="nav navbar-nav">
      <li><a href="#about">About</a></li>
      <li><a href="#portfolio">Portfolio</a></li>
      <li><a href="#contact">Contact</a></li>
    </ul>
    </div>
  </div>
</nav>

您可能希望将折叠按钮添加到导航栏标题中，否则您的链接将不会显示在移动设备宽度上，因此它看起来像：

<nav class="navbar navbar-inverse">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#nav" 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>
      <a class="navbar-brand" href="#about">
        <span style="font-family: 'Source Code Pro', Monospace; color:green"><i class="fa fa-code"></i>Ryan</span>
      </a>
    </div>
    <div class="collapse navbar-collapse"  id="nav">
    <ul class="nav navbar-nav">
      <li><a href="#about">About</a></li>
      <li><a href="#portfolio">Portfolio</a></li>
      <li><a href="#contact">Contact</a></li>
    </ul>
    </div>
  </div>
</nav>

Answer 2

正如有人所说 - 从加载的CSS文件中删除bootstrap 4并且它将起作用

Bootstrap导航栏垂直显示而不是水平显示

这是W3Schools示例代码：

这是Bootstrap网站的示例代码：

2 个答案: