Bootstrap5 滚动监听(Scrollspy)
滚动监听（Scrollspy）插件，即自动更新导航插件，会根据滚动条的位置自动更新对应的导航目标。其基本的实现是随着您的滚动。
如何创建滚动监听
以下实例演示了如何创建滚动监听：
实例
<
body
data-bs-spy
=
"
scroll
"
data-bs-target
=
"
.navbar
"
data-bs-offset
=
"
50
"
>
<
nav
class
=
"
navbar navbar-expand-sm bg-dark navbar-dark fixed-top
"
>
...
<
ul
class
=
"
navbar-nav
"
>
<
li
>
<
a
href
=
"
#section1
"
>
Section 1
</
a
>
</
li
>
...
</
nav
>
<
div
id
=
"
section1
"
>
<
h1
>
Section 1
</
h1
>
<
p
>
Try to scroll this page and look at the navigation bar while scrolling!
</
p
>
</
div
>
...
</
body
>
尝试一下 »
实例解析
向您想要监听的元素（通常是 body）添加
data-bs-spy="scroll"
。
然后添加
data-bs-target
属性，它的值为导航栏的 id 或 class (
.navbar
)。这样就可以联系上可滚动区域。
注意可滚动项元素上的 id
（
<div id="section1">
） 必须匹配导航栏上的链接选项 （
<a href="#section1">
)。
可选项
data-bs-offset
属性用于计算滚动位置时，距离顶部的偏移像素。 默认为 10 px。
设置相对定位:
使用
data-spy="scroll" 的元素需要将其 CSS
position
属性设置为
"relative"
才能起作用。
以下实例设置了垂直滚动监听：
实例
<
div
class
=
"
row
"
>
<
div
class
=
"
col-4
"
>
<
nav
id
=
"
navbar-example3
"
class
=
"
navbar navbar-light bg-light flex-column align-items-stretch p-3
"
>
<
a
class
=
"
navbar-brand
"
href
=
"
#
"
>
Navbar
</
a
>
<
nav
class
=
"
nav nav-pills flex-column
"
>
<
a
class
=
"
nav-link
"
href
=
"
#item-1
"
>
Item 1
</
a
>
<
nav
class
=
"
nav nav-pills flex-column
"
>
<
a
class
=
"
nav-link ms-3 my-1
"
href
=
"
#item-1-1
"
>
Item 1-1
</
a
>
<
a
class
=
"
nav-link ms-3 my-1
"
href
=
"
#item-1-2
"
>
Item 1-2
</
a
>
</
nav
>
<
a
class
=
"
nav-link
"
href
=
"
#item-2
"
>
Item 2
</
a
>
<
a
class
=
"
nav-link active
"
href
=
"
#item-3
"
>
Item 3
</
a
>
<
nav
class
=
"
nav nav-pills flex-column
"
>
<
a
class
=
"
nav-link ms-3 my-1
"
href
=
"
#item-3-1
"
>
Item 3-1
</
a
>
<
a
class
=
"
nav-link ms-3 my-1 active
"
href
=
"
#item-3-2
"
>
Item 3-2
</
a
>
</
nav
>
</
nav
>
</
nav
>
</
div
>
<
div
class
=
"
col-8
"
>
<
div
data-bs-spy
=
"
scroll
"
data-bs-target
=
"
#navbar-example3
"
data-bs-offset
=
"
"
class
=
"
scrollspy-example-2
"
tabindex
=
"
"
>
<
h4
id
=
"
item-1
"
>
Item 1
</
h4
>
<
p
>
...
</
p
>
<
h5
id
=
"
item-1-1
"
>
Item 1-1
</
h5
>
<
p
>
...
</
p
>
<
h5
id
=
"
item-1-2
"
>
Item 1-2
</
h5
>
<
p
>
...
</
p
>
<
h4
id
=
"
item-2
"
>
Item 2
</
h4
>
<
p
>
...
</
p
>
<
h4
id
=
"
item-3
"
>
Item 3
</
h4
>
<
p
>
...
</
p
>
<
h5
id
=
"
item-3-1
"
>
Item 3-1
</
h5
>
<
p
>
...
</
p
>
<
h5
id
=
"
item-3-2
"
>
Item 3-2
</
h5
>
<
p
>
...
</
p
>
</
div
>
</
div
>
</
div
>
尝试一下 »
列表组形式：
实例
<
div
id
=
"
list-example
"
class
=
"
list-group
"
>
<
a
class
=
"
list-group-item list-group-item-action
"
href
=
"
#list-item-1
"
>
Item 1
</
a
>
<
a
class
=
"
list-group-item list-group-item-action
"
href
=
"
#list-item-2
"
>
Item 2
</
a
>
<
a
class
=
"
list-group-item list-group-item-action
"
href
=
"
#list-item-3
"
>
Item 3
</
a
>
<
a
class
=
"
list-group-item list-group-item-action
"
href
=
"
#list-item-4
"
>
Item 4
</
a
>
</
div
>
<
div
data-bs-spy
=
"
scroll
"
data-bs-target
=
"
#list-example
"
data-bs-offset
=
"
"
class
=
"
scrollspy-example
"
tabindex
=
"
"
>
<
h4
id
=
"
list-item-1
"
>
Item 1
</
h4
>
<
p
>
...
</
p
>
<
h4
id
=
"
list-item-2
"
>
Item 2
</
h4
>
<
p
>
...
</
p
>
<
h4
id
=
"
list-item-3
"
>
Item 3
</
h4
>
<
p
>
...
</
p
>
<
h4
id
=
"
list-item-4
"
>
Item 4
</
h4
>
<
p
>
...
</
p
>
</
div
>
尝试一下 »
