2021 年更新
引导程序 5（测试版）
Bootstrap 5 也有一个 flexbox 导航栏，并引入了新的 RTL 支持。因此，“左”和“右”的概念已被“开始”和“结束”所取代。因此，Bootstrap 5 beta 的保证金工具发生了变化：
-
ml-auto => ms-auto
-
mr-auto => me-auto
还要注意data-toggle 和data-target 也发生了变化：
-
data-toggle => data-bs-toggle
-
data-target => data-bs-target
Navbar Demo for Bootstrap 5
引导程序 4
既然 Bootstrap 4 有 flexbox，导航栏对齐就容易多了。这里是updated examples for left, right and center in the Bootstrap 4 Navbar 和many other alignment scenarios demonstrated here。
flexbox、auto-margins 和 ordering 实用程序类可用于根据需要对齐导航栏内容。有很多事情需要考虑，包括导航栏项目（品牌、链接、切换器）在大屏幕和移动/折叠视图上的顺序和对齐方式。 不要将网格类（行、列）用于导航栏。
这里有各种各样的例子……
左、中（品牌）和右链接：
<nav class="navbar navbar-expand-md navbar-dark bg-dark">
<div class="navbar-collapse collapse w-100 order-1 order-md-0 dual-collapse2">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Left</a>
</li>
<li class="nav-item">
<a class="nav-link" href="//codeply.com">Codeply</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
</ul>
</div>
<div class="mx-auto order-0">
<a class="navbar-brand mx-auto" href="#">Navbar 2</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target=".dual-collapse2">
<span class="navbar-toggler-icon"></span>
</button>
</div>
<div class="navbar-collapse collapse w-100 order-3 dual-collapse2">
<ul class="navbar-nav ml-auto">
<li class="nav-item">
<a class="nav-link" href="#">Right</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
</ul>
</div>
</nav>
http://codeply.com/go/qhaBrcWp3v
center links and overlay logo image 的另一个 BS4 导航栏选项：
<nav class="navbar navbar-expand-lg navbar-dark bg-dark">
<div class="navbar-collapse collapse w-100 dual-collapse2 order-1 order-md-0">
<ul class="navbar-nav ml-auto text-center">
<li class="nav-item active">
<a class="nav-link" href="#">Link</a>
</li>
</ul>
</div>
<div class="mx-auto my-2 order-0 order-md-1 position-relative">
<a class="mx-auto" href="#">
<img src="//placehold.it/120/ccff00" class="rounded-circle">
</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target=".dual-collapse2">
<span class="navbar-toggler-icon"></span>
</button>
</div>
<div class="navbar-collapse collapse w-100 dual-collapse2 order-2 order-md-2">
<ul class="navbar-nav mr-auto text-center">
<li class="nav-item">
<a class="nav-link" href="#">Link</a>
</li>
</ul>
</div>
</nav>
或者，这些其他 Bootstrap 4 对齐方案：
brand left, dead center links, (empty right)
brand and links center, icons left and right
更多 Bootstrap 4 示例：
toggler left on mobile, brand right
center brand and links on mobile
right align links on desktop, center links on mobile
left links & toggler, center brand, search right
另请参阅：Bootstrap 4 align navbar items to the right
Bootstrap 4 navbar right align with button that doesn't collapse on mobile
Center an element in Bootstrap 4 Navbar
引导 3
选项 1 - 品牌中心，带有左/右导航链接：
<nav class="navbar navbar-default" role="navigation">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<a class="navbar-brand" href="#">Brand</a>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav navbar-left">
<li><a href="#">Left</a></li>
<li><a href="#about">Left</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#about">Right</a></li>
<li><a href="#contact">Right</a></li>
</ul>
</div>
</nav>
.navbar-brand
{
position: absolute;
width: 100%;
left: 0;
text-align: center;
margin:0 auto;
}
.navbar-toggle {
z-index:3;
}
http://bootply.com/98314 (3.x)
选项 2 - 左、中和右导航链接：
<nav class="navbar navbar-default" role="navigation">
<div class="navbar-header">
<button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
<span class="icon-bar"></span>
<span class="icon-bar"></span>
<span class="icon-bar"></span>
</button>
</div>
<div class="navbar-collapse collapse">
<ul class="nav navbar-nav">
<li><a href="#">Left</a></li>
</ul>
<ul class="nav navbar-nav navbar-center">
<li><a href="#">Center</a></li>
<li><a href="#">Center</a></li>
<li><a href="#">Center</a></li>
</ul>
<ul class="nav navbar-nav navbar-right">
<li><a href="#">Right</a></li>
</ul>
</div>
</nav>
@media (min-width: 768px) {
.navbar-nav.navbar-center {
position: absolute;
left: 50%;
transform: translatex(-50%);
}
}
http://bootply.com/SGYC6BWeBK
选项 3 - 将品牌和链接居中
.navbar .navbar-header,
.navbar-collapse {
float:none;
display:inline-block;
vertical-align: top;
}
@media (max-width: 768px) {
.navbar-collapse {
display: block;
}
}
http://codeply.com/go/1lrdvNH9GI
更多示例：
Left brand, center links
Left toggler, center brand
对于 3.x，另请参阅 nav-justified：Bootstrap center navbar
Center Navbar in Bootstrap
Bootstrap 4 align navbar items to the right