[英]Bootstrap v4 Navbar bug?
这是问题所在。 我从引导程序侧（ https://v4-alpha.getbootstrap.com/components/navbar/ ）获取了默认的导航栏示例。 它们会显示完整大小的导航栏，当屏幕变小时，导航栏可能会折叠。 但是，当我将代码插入到项目中时，它显示如下：
如您所见，它总是折叠的。 我尝试了很多其他示例，但没有任何效果。 这是代码：
<!DOCTYPE html> <html> <head> <title>Test area</title> <link rel="stylesheet" href="media/css/bootstrap.min.css"> </head> <body> <div class="header"> <div class="top-header"> <div class="container"> <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> </div> </div> </div> <script src="media/js/jquery.min.js"></script> <script src="media/js/popper.min.js"></script> <script src="media/js/bootstrap.min.js"></script> </body> </html>
您发布的代码仅适用于Bootstrap alpha 6，不适用于beta。 这是因为从Bootstrap 4 beta开始， navbar-toggleable*类已更改为navbar-expand* 。
Bootstrap 4.0.0 ： https : //www.codeply.com/go/0c0FC1Lrn2
<nav class="navbar navbar-expand-lg navbar-light bg-faded">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" 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>
<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>
您需要添加必要的meta标签描述在这里 ：
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
并按照此处所述使用正确的CSS类
<nav class="navbar navbar-expand-lg navbar-light bg-light">
导航栏将在lg断点处折叠
<!DOCTYPE html> <html> <head> <!-- Required meta tags --> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no"> <title>Test area</title> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous"> </head> <body> <div class="header"> <div class="top-header"> <div class="container"> <nav class="navbar navbar-expand-lg 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> </div> </div> </div> <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script> </body> </html>
对于现在看的任何人，该代码现在都可以与当前最新的引导程序一起使用。
npm install bootstrap@4.0.0-beta.3
记住要重新加载以验证更改！
导航栏折叠切换不会关闭（从引导程序v4 beta切换到v4 alpha 6之后）
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