这是Bootstrap 3的一个老问题 - ＆gt;更改导航栏的折叠点，但此处建议的方法：
https://coderwall.com/p/wpjw4w/change-the-bootstrap-navbar-breakpoint
在这里：
不适用于 768px 下方的折叠，它似乎只适用于扩展折叠点，而不是缩回它。我有一个特殊情况，我的导航栏有3个按钮，所以它不需要这么早就崩溃。我希望它以420px的速度崩溃。
这有解决方案吗？如果没有，有人可以指向我需要更改和下载的引导程序自定义页面中的正确属性吗？这可能是通用断点吗？因为没有什么我能看到的Navbar断点：
http://getbootstrap.com/customize/
根据要求，导航栏的HTML只是：
<nav class="navbar navbar-default navbar-fixed-top">
<div class="container-fluid">
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<div class="navbar-collapse collapse" id = "navbar">
<ul class="nav navbar-nav navbar-left">
<li class = "navbar_buttons"><a id = "new_route_button"><strong>New Route</strong></a></li>
<li class="divider-vertical"></li>
<li class = "navbar_buttons"><a id = "clear_route_button">Clear Route</a></li>
</ul>
<ul class="nav navbar-nav navbar-right"> <!--Right justified navbar list-->
<li class = "navbar_buttons"><a id = "about_button">About</a></li>
</ul>
</div>
</div> <!-- Container -->
</nav> <!-- End of Navbar Container -->
然后我有一些CSS来添加垂直分区：
/*Preventing vertical dividers from appearing collapsed*/
@media (max-width: 420px) {
.navbar-collapse .nav > .divider-vertical {
display: none;
}
}
/*Defining the vertical dividers*/
.navbar .divider-vertical {
height: 50px;
margin: 0 9px;
border-right: 1px solid #ffffff;
border-left: 1px solid #DADADA;
}
.navbar-inverse .divider-vertical {
border-right-color: #222222;
border-left-color: #111111;
}
答案 0 :(得分：8)
是的，将断点更改为小于768px 的任何内容都与changing the breakpoint over 768px不同。您需要覆盖通常使其崩溃的所有Bootstrap默认值。
@media only screen and (min-width: 420px) {
.collapse {
display: block;
}
.navbar-header {
float: left;
}
.navbar-toggle {
display: none;
}
.navbar-nav.navbar-left {
float: left;
margin: 0;
}
.navbar-nav.navbar-right {
float: right;
margin: 0;
}
.navbar-nav>li {
float: left;
}
.navbar-nav>li>a {
padding-top: 15px;
padding-bottom: 15px;
}
}
@media only screen and (max-width: 420px) {
.collapse {
display: none;
}
.navbar-header {
display: block;
}
}
答案 1 :(得分：0)
以下代码段基于原始答案，但在导航栏中有下拉菜单时也有效。
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
<style>
@media only screen and (min-width: 560px) {
.collapse {
display: block;
}
.navbar-header {
float: left;
}
.navbar-toggle {
display: none;
}
.navbar>.container .navbar-brand,
.navbar>.container-fluid .navbar-brand {
margin-left: -15px;
}
.container>.navbar-header,
.container-fluid>.navbar-header,
.container>.navbar-collapse,
.container-fluid>.navbar-collapse {
margin-right: 0;
margin-left: 0;
}
.navbar-nav {
float: left;
margin: 0;
}
.navbar-nav.navbar-right {
float: right;
margin: 0;
}
.navbar-nav>li {
float: left;
}
.navbar-nav>li>a {
padding-top: 15px;
padding-bottom: 15px;
}
.navbar-nav .open .dropdown-menu {
position: absolute;
float: left;
width: auto;
margin-top: 2px;
background-color: #fff;
border: 1px solid #ccc;
border: 1px solid rgba(0, 0, 0, 0.15);
-webkit-box-shadow: 0 6px 12px rgba(0, 0, 0, 0.175);
box-shadow: 0 6px 12px rgba(0, 0, 0, 0.175);
}
.navbar-inverse .navbar-nav .open .dropdown-menu .divider {
background-color: #e5e5e5;
}
.navbar-inverse .navbar-nav .open .dropdown-menu>li>a {
color: #333;
}
.navbar-nav .open .dropdown-menu>li>a {
line-height: 1.42857143;
}
.navbar-nav .open .dropdown-menu>li>a,
.navbar-nav .open .dropdown-menu .dropdown-header {
padding: 3px 20px;
}
.navbar-right .dropdown-menu {
right: 0;
left: auto;
}
}
@media only screen and (max-width: 559px) {
.collapse {
display: none;
}
.navbar-header {
display: block;
}
}
</style>
<nav class="navbar navbar-default">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
<button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
<span class="sr-only">Toggle navigation</span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
<a class="navbar-brand" href="#">Brand</a>
</div>
<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
<ul class="nav navbar-nav">
<li class="active"><a href="#">Link <span class="sr-only">(current)</span></a></li>
<li><a href="#">Link</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">One more separated link</a></li>
</ul>
</li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Link</a></li>
<li class="dropdown">
<a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">Dropdown <span class="caret"></span></a>
<ul class="dropdown-menu">
<li><a href="#">Action</a></li>
<li><a href="#">Another action</a></li>
<li><a href="#">Something else here</a></li>
<li role="separator" class="divider"></li>
<li><a href="#">Separated link</a></li>
</ul>
</li>
</ul>
</div>
<!-- /.navbar-collapse -->
</div>
<!-- /.container-fluid -->
</nav>