导航栏是一个很好的功能,是 Bootstrap 网站的一个突出特点。导航栏在您的应用或网站中作为导航页头的响应式基础组件。导航栏在移动设备的视图中是折叠的,随着可用视口宽度的增加,导航栏也会水平展开。在 Bootstrap 导航栏的核心中,导航栏包括了站点名称和基本的导航定义样式。
创建一个默认的导航栏的步骤如下:
下面的实例演示了这点:
<
nav
class
=
"
navbar navbar-default
"
role
=
"
navigation
"
>
<
div
class
=
"
container-fluid
"
>
<
div
class
=
"
navbar-header
"
>
<
a
class
=
"
navbar-brand
"
href
=
"
#
"
>
菜鸟教程
a
>
div
>
<
div
>
<
ul
class
=
"
nav navbar-nav
"
>
<
li
class
=
"
active
"
>
<
a
href
=
"
#
"
>
iOS
a
>
li
>
<
li
>
<
a
href
=
"
#
"
>
SVN
a
>
li
>
<
li
class
=
"
dropdown
"
>
<
a
href
=
"
#
"
class
=
"
dropdown-toggle
"
data-toggle
=
"
dropdown
"
>
Java
<
b
class
=
"
caret
"
>
b
>
a
>
<
ul
class
=
"
dropdown-menu
"
>
<
li
>
<
a
href
=
"
#
"
>
jmeter
a
>
li
>
<
li
>
<
a
href
=
"
#
"
>
EJB
a
>
li
>
<
li
>
<
a
href
=
"
#
"
>
Jasper Report
a
>
li
>
<
li
class
=
"
divider
"
>
li
>
<
li
>
<
a
href
=
"
#
"
>
分离的链接
a
>
li
>
<
li
class
=
"
divider
"
>
li
>
<
li
>
<
a
href
=
"
#
"
>
另一个分离的链接
a
>
li
>
ul
>
li
>
ul
>
div
>
div
>
nav
>
尝试一下 »
结果如下所示:
为了给导航栏添加响应式特性,您要折叠的内容必须包裹在带有 class .collapse、.navbar-collapse 的
下面的实例演示了这点:
<
nav
class
=
"
navbar navbar-default
"
role
=
"
navigation
"
>
<
div
class
=
"
container-fluid
"
>
<
div
class
=
"
navbar-header
"
>
<
button
type
=
"
button
"
class
=
"
navbar-toggle
"
data-toggle
=
"
collapse
"
data-target
=
"
#example-navbar-collapse
"
>
<
span
class
=
"
sr-only
"
>
切换导航
span
>
<
span
class
=
"
icon-bar
"
>
span
>
<
span
class
=
"
icon-bar
"
>
span
>
<
span
class
=
"
icon-bar
"
>
span
>
button
>
<
a
class
=
"
navbar-brand
"
href
=
"
#
"
>
菜鸟教程
a
>
div
>
<
div
class
=
"
collapse navbar-collapse
"
id
=
"
example-navbar-collapse
"
>
<
ul
class
=
"
nav navbar-nav
"
>
<
li
class
=
"
active
"
>
<
a
href
=
"
#
"
>
iOS
a
>
li
>
<
li
>
<
a
href
=
"
#
"
>
SVN
a
>
li
>
<
li
class
=
"
dropdown
"
>
<
a
href
=
"
#
"
class
=
"
dropdown-toggle
"
data-toggle
=
"
dropdown
"
>
Java
<
b
class
=
"
caret
"
>
b
>
a
>
<
ul
class
=
"
dropdown-menu
"
>
<
li
>
<
a
href
=
"
#
"
>
jmeter
a
>
li
>
<
li
>
<
a
href
=
"
#
"
>
EJB
a
>
li
>
<
li
>
<
a
href
=
"
#
"
>
Jasper Report
a
>
li
>
<
li
class
=
"
divider
"
>
li
>
<
li
>
<
a
href
=
"
#
"
>
分离的链接
a
>
li
>
<
li
class
=
"
divider
"
>
li
>
<
li
>
<
a
href
=
"
#
"
>
另一个分离的链接
a
>
li
>
ul
>
li
>
ul
>
div
>
div
>
nav
>
尝试一下 »
结果如下所示:
导航栏中的表单不是使用 Bootstrap 表单 章节中所讲到的默认的 class,它是使用 .navbar-form class。这确保了表单适当的垂直对齐和在较窄的视口中折叠的行为。使用对齐方式选项(这将在组件对齐方式部分进行详细讲解)来决定导航栏中的内容放置在哪里。
下面的实例演示了这点:
<
nav
class
=
"
navbar navbar-default
"
role
=
"
navigation
"
>
<
div
class
=
"
container-fluid
"
>
<
div
class
=
"
navbar-header
"
>
<
a
class
=
"
navbar-brand
"
href
=
"
#
"
>
菜鸟教程
a
>
div
>
<
form
class
=
"
navbar-form navbar-left
"
role
=
"
search
"
>
<
div
class
=
"
form-group
"
>
<
input
type
=
"
text
"
class
=
"
form-control
"
placeholder
=
"
Search
"
>
div
>
<
button
type
=
"
submit
"
class
=
"
btn btn-default
"
>
提交
button
>
form
>
div
>
nav
>
尝试一下 »
结果如下所示:
您可以使用 class .navbar-btn 向不在