twitter-bootstrap Bootstrap 4：无论屏幕大小，始终显示移动菜单按钮
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Bootstrap 4: Always display the mobile menu button no matter screen size
提问by Bill Johnson
How can I get always display the mobile menu button no matter screen size? I do not want the links to appear until a person clicks the mobile button. Thank you!
无论屏幕大小如何，如何始终显示移动菜单按钮？我不希望在有人单击移动按钮之前显示链接。谢谢！
I realize there is a post here on Bootstrap 3, however it does not work with Bootstrap 4. Will you please advise?
我知道这里有一篇关于 Bootstrap 3 的帖子，但是它不适用于 Bootstrap 4。请您指教一下？
回答by Zim
Update Bootstrap 4.1.x
更新引导程序 4.1.x
Exclude the navbar-expand*class.
排除navbar-expand*班级。
As of beta, the navbar-toggleable-*class was replaced with navbar-expand-*, but now everythings moves up a tier. Since the default state of the navbar is always collapsed/mobile (xs) you'd simply exclude the navbar-expand-*class so that the menu is always collapsed on all tiers.
在测试版中，navbar-toggleable-*该类被替换为navbar-expand-*，但现在一切都向上移动了一层。由于导航栏的默认状态始终是折叠/移动 (xs)，因此您只需排除navbar-expand-*该类，以便菜单始终在所有层上折叠。
Beta demo: https://www.codeply.com/go/HiMQd9taEd
Bootstrap 4.1.3: https://www.codeply.com/go/ugmj6XKY79
测试版演示：https: //www.codeply.com/go/HiMQd9taEd
Bootstrap 4.1.3：https: //www.codeply.com/go/ugmj6XKY79
Original Answer (Bootstrap 4 alpha)
原始答案（Bootstrap 4 alpha）
In Bootstrap 4 the navbar is very different than 3.x, and it is always collapsedunless overriden by one of the navbar-toggleable-* classes. You just need to make sure your navbar doesn't include navbar-toggleable-*.
在 Bootstrap 4 中，导航栏与 3.x 非常不同，它总是折叠起来，除非被导航栏-toggleable-* 类之一覆盖。您只需要确保您的导航栏不包含navbar-toggleable-*.
<nav class="navbar navbar-fixed-top">
<button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#collapsingNavbar">
<span class="navbar-toggler-icon"></span>
</button>
<a class="navbar-brand" href="#">Navbar</a>
<div class="navbar-collapse collapse" id="collapsingNavbar">
<ul class="navbar-nav">
<li class="nav-item active">
<a class="nav-link" href="#">Home</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Features</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Wow</a>
</li>
</ul>
</div>
</nav>
Alpha demo: http://www.codeply.com/go/LN6szcJO53
Alpha 演示：http: //www.codeply.com/go/LN6szcJO53
