Bootstrap 导航栏列表项/链接未显示 [英] Bootstrap Navbar list items/links not showing

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问题描述

我正在学习使用 Bootstrap 并使用组件，特别是导航栏.

我的链接/列表项未显示.我直接从 Bootstrap 复制了代码.我希望有人能解释一下我遗漏了什么.

<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><!-- 引导 css --><link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.2/css/bootstrap.min.css"integrity="sha384-y3tfxAZXuh4HwSYylfB+J125MxIs6mR5FOHamPBG064z8nqdfhCB"crossorigin="匿名"><身体><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="切换导航"><span class="navbar-toggler-icon"></span><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="#">功能</a><a class="nav-item nav-link" href="#">定价</a><a class="nav-item nav-link disabled" href="#">Disabled</a>

</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/8U7i6PWi6AlO1L79snBrmgiDpgIWJ82z8eA51vPA1"cross

解决方案

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

确保您在 Codepen 中正确引用它为 https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-alpha.6/css/bootstrap.min.css

或者，使用 Codeply，它将为您包含所有相关的库:Codeply 上的 Bootstrap 4

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

</nav>

<小时>

相关:在引导程序 4 中禁用响应式导航栏

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

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>

解决方案

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

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

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>

Related: Disable responsive navbar in bootstrap 4

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