[英]Bootstrap v4 Navbar bug?
這是問題所在。 我從引導程序側（ https://v4-alpha.getbootstrap.com/components/navbar/ ）獲取了默認的導航欄示例。 它們會顯示完整大小的導航欄，當屏幕變小時，導航欄可能會折疊。 但是，當我將代碼插入到項目中時，它顯示如下：
如您所見，它總是折疊的。 我嘗試了很多其他示例，但沒有任何效果。 這是代碼：
<!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>
您發布的代碼僅適用於Bootstrap alpha 6，不適用於beta。 這是因為從Bootstrap 4 beta開始， navbar-toggleable*類已更改為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標簽描述在這里 ：
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
並按照此處所述使用正確的CSS類
<nav class="navbar navbar-expand-lg navbar-light bg-light">
導航欄將在lg斷點處折疊
<!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>
對於現在看的任何人，該代碼現在都可以與當前最新的引導程序一起使用。
npm install bootstrap@4.0.0-beta.3
記住要重新加載以驗證更改！
導航欄折疊切換不會關閉（從引導程序v4 beta切換到v4 alpha 6之后）
[英]Navbar Collapse Toggle Won't Turn Off (after switching from bootstrap v4 beta to v4 alpha 6)
聲明:本站的技術帖子網頁，遵循CC BY-SA 4.0協議，如果您需要轉載，請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.