创新互联Bootstrap4教程：Bootstrap4导航栏

Bootstrap4 导航栏

导航栏一般放在页面的顶部。

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我们可以使用 .navbar 类来创建一个标准的导航栏，后面紧跟: .navbar-expand-xl|lg|md|sm 类来创建响应式的导航栏 (大屏幕水平铺开，小屏幕垂直堆叠)。

导航栏上的选项可以使用

元素上添加 .nav-item 类，元素上使用 .nav-link 类:
实例

<
nav

class
=
"
navbar navbar-expand-sm bg-light
"
>

<
ul

class
=
"
navbar-nav
"
>

<
li

class
=
"
nav-item
"
>

<
a

class
=
"
nav-link
"

href
=
"
#
"
>
Link 1
a
>

li
>

<
li

class
=
"
nav-item
"
>

<
a

class
=
"
nav-link
"

href
=
"
#
"
>
Link 2
a
>

li
>

<
li

class
=
"
nav-item
"
>

<
a

class
=
"
nav-link
"

href
=
"
#
"
>
Link 3
a
>

li
>

ul
>

nav
>

尝试一下 »
垂直导航栏

通过删除 .navbar-expand-xl|lg|md|sm 类来创建垂直导航栏:
实例

<
nav

class
=
"
navbar bg-light
"
>

<
ul

class
=
"
navbar-nav
"
>

<
li

class
=
"
nav-item
"
>

<
a

class
=
"
nav-link
"

href
=
"
#
"
>
Link 1
a
>

li
>

<
li

class
=
"
nav-item
"
>

<
a

class
=
"
nav-link
"

href
=
"
#
"
>
Link 2
a
>

li
>

<
li

class
=
"
nav-item
"
>

<
a

class
=
"
nav-link
"

href
=
"
#
"
>
Link 3
a
>

li
>

ul
>

nav
>

尝试一下 »
居中对齐的导航栏

通过添加 .justify-content-center 类来创建居中对齐的导航栏:
实例

<
nav

class
=
"
navbar navbar-expand-sm bg-light justify-content-center
"
>
...
nav
>

尝试一下 »
不同颜色导航栏

可以使用以下类来创建不同颜色导航栏：.bg-primary, .bg-success, .bg-info, .bg-warning, .bg-danger, .bg-secondary, .bg-dark 和 .bg-light)。
提示: 对于暗色背景需要设置文本颜色为浅色的，对于浅色背景需要设置文本颜色为深色的。
实例

<
nav

class
=
"
navbar navbar-expand-sm bg-light navbar-light
"
>

<
ul

class
=
"
navbar-nav
"
>

<
li

class
=
"
nav-item active
"
>

<
a

class
=
"
nav-link
"

href
=
"
#
"
>
Active
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 disabled
"

href
=
"
#
"
>
Disabled
a
>

li
>

ul
>

nav
>

<
nav

class
=
"
navbar navbar-expand-sm bg-dark navbar-dark
"
>
...
nav
>

<
nav

class
=
"
navbar navbar-expand-sm bg-primary navbar-dark
"
>
...
nav
>

尝试一下 »
激活和禁用状态: 可以在元素上添加 .active 类来高亮显示选中的选项。 .disabled 类用于设置该链接是不可点击的。
品牌/Logo

.navbar-brand 类用于高亮显示品牌/Logo:
实例

<
nav

class
=
"
navbar navbar-expand-sm bg-dark navbar-dark
"
>

<
a

class
=
"
navbar-brand
"

href
=
"
#
"
>
Logo
a
>
...
nav
>

尝试一下 »
可以使用 .navbar-brand 类来设置图片自适应导航栏。
实例

<
nav

class
=
"
navbar navbar-expand-sm bg-dark navbar-dark
"
>

<
a

class
=
"
navbar-brand
"

href
=
"
#
"
>

<
img

decoding
=
"
async
"

src
=
"
bird.jpg
"

alt
=
"
Logo
"

style
=
"
width:40px;
"
>

a
>
...
nav
>

尝试一下 »
折叠导航栏

通常，小屏幕上我们都会折叠导航栏，通过点击来显示导航选项。
要创建折叠导航栏，可以在按钮上添加 class="navbar-toggler", data-toggle="collapse" 与 data-target="#thetarget" 类。然后在设置了 class="collapse navbar-collapse" 类的 div 上包裹导航内容（链接）, div 元素上的 id 匹配按钮 data-target 的上指定的 id:
实例

<
nav

class
=
"
navbar navbar-expand-md bg-dark navbar-dark
"
>

<
a

class
=
"
navbar-brand
"

href
=
"
#
"
>
Navbar
a
>

<
button

class
=
"
navbar-toggler
"

type
=
"
button
"

data-toggle
=
"
collapse
"

data-target
=
"
#collapsibleNavbar
"
>

<
span

class
=
"
navbar-toggler-icon
"
>
span
>

button
>

<
div

class
=
"
collapse navbar-collapse
"

id
=
"
collapsibleNavbar
"
>

<
ul

class
=
"
navbar-nav
"
>

<
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
>

nav
>

尝试一下 »
导航栏使用下拉菜单

导航栏上可以设置下拉菜单：
实例

<
nav

class
=
"
navbar navbar-expand-sm bg-dark navbar-dark
"
>

<
a

class
=
"
navbar-brand
"

href
=
"
#
"
>
Logo
a
>

<
ul

class
=
"
navbar-nav
"
>

<
li

class
=
"
nav-item
"
>

<
a

class
=
"
nav-link
"

href
=
"
#
"
>
Link 1
a
>

li
>

<
li

class
=
"
nav-item
"
>

<
a

class
=
"
nav-link
"

href
=
"
#
"
>
Link 2
a
>

li
>

<
li

class
=
"
nav-item dropdown
"
>

<
a

class
=
"
nav-link dropdown-toggle
"

href
=
"
#
"

id
=
"
navbardrop
"

data-toggle
=
"
dropdown
"
>
Dropdown link
a
>

<
div

class
=
"
dropdown-menu
"
>

<
a

class
=
"
dropdown-item
"

href
=
"
#
"
>
Link 1
a
>

<
a

class
=
"
dropdown-item
"

href
=
"
#
"
>
Link 2
a
>

<
a

class
=
"
dropdown-item
"

href
=
"
#
"
>
Link 3
a
>

div
>

li
>

ul
>

nav
>

尝试一下 »
导航栏的表单与按钮

导航栏的表单
元素使用 class="form-inline" 类来排版输入框与按钮：
实例

<
nav

class
=
"
navbar navbar-expand-sm bg-dark navbar-dark
"
>

<
form

class
=
"
form-inline
"
>

<
input

class
=
"
form-control
"

type
=
"
text
"

placeholder
=
"
Search
"
>

<
button

class
=
"
btn btn-success
"

type
=
"
submit
"
>
Search
button
>

form
>

nav
>

尝试一下 »
你也可以使用其他的输入框类，如 .input-group-addon 类用于在输入框前添加小标签。
实例

<
nav

class
=
"
navbar navbar-expand-sm bg-dark navbar-dark
"
>

<
form

class
=
"
form-inline
"

action
=
"
/action_page.php
"
>

<
div

class
=
"
input-group
"
>

<
div

class
=
"
input-group-prepend
"
>

<
span

class
=
"
input-group-text
"
>
@
span
>

div
>

<
input

type
=
"
text
"

class
=
"
form-control
"

placeholder
=
"
Username
"
>

div
>

form
>

nav
>

尝试一下 »
导航栏文本

使用 .navbar-text 类来设置导航栏上非链接文本，可以保证水平对齐，颜色与内边距一样。
实例

<
nav

class
=
"
navbar navbar-expand-sm bg-dark navbar-dark
"
>

<
ul

class
=
"
navbar-nav
"
>

<
li

class
=
"
nav-item
"
>

<
a

class
=
"
nav-link
"

href
=
"
#
"
>
Link 1
a
>

li
>

<
li

class
=
"
nav-item
"
>

<
a

class
=
"
nav-link
"

href
=
"
#
"
>
Link 2
a
>

li
>

ul
>

<
span

class
=
"
navbar-text
"
>
Navbar text
span
>

nav
>

尝试一下 »
固定导航栏

导航栏可以固定在头部或者底部。
我们使用 .fixed-top 类来实现导航栏的固定：
实例

<
nav

class
=
"
navbar navbar-expand-sm bg-dark navbar-dark fixed-top
"
>
...
nav
>

尝试一下 »
.fixed-bottom 类用于设置导航栏固定在底部：
实例

<
nav

class
=
"
navbar navbar-expand-sm bg-dark navbar-dark fixed-bottom
"
>
...
nav
>

尝试一下 »

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