Bootstrap Navbar列表项/链接未显示

本文介绍了Bootstrap Navbar列表项/链接未显示的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！

问题描述

我正在学习使用Bootstrap并使用组件，特别是导航栏.

I am learning to use Bootstrap and playing with components, specifically the navbar.

我的链接/列表项未显示.我已经直接从Bootstrap复制了代码.我希望有人可以解释一下我所缺少的内容.

My links/list items aren't showing. I have copied code directly from Bootstrap.I'm hoping someone could please explain what I'm missing.

<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <meta http-equiv="x-ua-compatible" content="ie=edge">
    <title>NavBar</title>

    <!-- bootstrap css -->
    <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.2/css/bootstrap.min.css" integrity="sha384-y3tfxAZXuh4HwSYylfB+J125MxIs6mR5FOHamPBG064zB+AFeWH94NdvaCBm8qnd" crossorigin="anonymous">
</head>
<body>
    <nav class="navbar navbar-toggleable-md navbar-light bg-faded">
        <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>
        <a class="navbar-brand" href="#">Navbar</a>
        <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
            <div class="navbar-nav">
                <a class="nav-item nav-link active" href="#">Home <span class="sr-only">(current)</span></a>
                <a class="nav-item nav-link" href="#">Features</a>
                <a class="nav-item nav-link" href="#">Pricing</a>
                <a class="nav-item nav-link disabled" href="#">Disabled</a>
            </div>
        </div>
    </nav>
    <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.4/jquery.min.js"></script>
    <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.2/js/bootstrap.min.js" integrity="sha384-vZ2WRJMwsjRMW/8U7i6PWi6AlO1L79snBrmgiDpgIWJ82z8eA5lenwvxbMV1PAh7" crossorigin="anonymous">
    </script>
</body>

推荐答案

在 Bootstrap 4 中，需要navbar-expand-*类来显示水平导航栏，否则它将折叠成移动状态.

In Bootstrap 4, the navbar-expand-* class is needed to show the horizontal navbar, otherwise it will collapse into it's mobile state.

确保您已在Codepen中正确引用为 https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css

Make sure you've referenced it properly in the Codepen as https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css

Or ，使用Codeply，它将包括所有与您相关的库: Codeply上的Bootstrap 4

Or, use Codeply, and it will include the all the relevant libraries for you:Bootstrap 4 on Codeply

以下是带有 Bootstrap 4.0.0 的导航栏: http://www.codeply.com/go/SmEyy7rg5S

Here's the Navbar with Bootstrap 4.0.0:http://www.codeply.com/go/SmEyy7rg5S

<nav class="navbar navbar-expand-md navbar-light bg-faded">
    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>
    <a class="navbar-brand" href="#">Navbar</a>
    <div class="collapse navbar-collapse" id="navbarNavAltMarkup">
        <div class="navbar-nav">
            <a class="nav-item nav-link active" href="#">Home <span class="sr-only">(current)</span></a>
            <a class="nav-item nav-link" href="#">Features</a>
            <a class="nav-item nav-link" href="#">Pricing</a>
            <a class="nav-item nav-link disabled" href="#">Disabled</a>
        </div>
    </div>
</nav>

相关:在引导程序4中禁用响应式导航栏

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