为什么这个引导程序导航不起作用

我正在使用Bootstrap建议的确切代码：-

<nav class="navbar navbar-default navbar-static-top">
    <div class="container">
        <div class="navbar-header">
            <button type="button" data-target="#navbarCollapse5" data-toggle="collapse" class="navbar-toggle">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a href="#" class="navbar-brand">Brand</a>
        </div>
        <div id="navbarCollapse5" class="collapse navbar-collapse">
            <ul class="nav navbar-nav">
                <li class="active"><a href="#">Home</a></li>
                <li><a href="#">Profile</a></li>
                <li><a href="#">Messages</a></li>
            </ul>
            <ul class="nav navbar-nav navbar-right">
                <li><a href="#">Login</a></li>
            </ul>
        </div>
    </div>
</nav>

这是JSFiddle。

请注意，我确实在JSFiddle中使用了Bootstrap CSS和JS作为外部资源。

您需要将

v4 标记用于当前版本的引导程序，或者将 v3 用于当前标记

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>

现在试试它正在为我工作，你正在使用引导 v4.0.0-beta.2 尝试使用 3.3.7

    .bs-example{
    	margin: 20px;
    }

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Example of Bootstrap 3 Static Navbar</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.12.4/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head> 
<body>
<div class="bs-example">
    <nav class="navbar navbar-default">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
            <button type="button" data-target="#navbarCollapse" data-toggle="collapse" class="navbar-toggle">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a href="#" class="navbar-brand">Brand</a>
        </div>
        <!-- Collection of nav links and other content for toggling -->
        <div id="navbarCollapse" class="collapse navbar-collapse">
            <ul class="nav navbar-nav">
                <li class="active"><a href="#">Home</a></li>
                <li><a href="#">Profile</a></li>
                <li><a href="#">Messages</a></li>
            </ul>
            <ul class="nav navbar-nav navbar-right">
                <li><a href="#">Login</a></li>
            </ul>
        </div>
    </nav>
</div>
</body>
</html>

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