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黏性定位

使元素保持在視窗頂部，例如黏性導覽。

用法

若要建立一個在向下捲動網站時保持在視窗頂部的元素，請將 uk-sticky 屬性新增至該元素。

<div uk-sticky></div>
黏在頂部
<div class="uk-background-muted uk-height-large">
    <div class="uk-card uk-card-default uk-card-body uk-text-center uk-position-z-index" uk-sticky="end: !.uk-height-large; offset: 80">Stick to the top</div>
</div>

注意 此頁面上的範例元素只會黏性定位，直到您向下捲動到下一個標題，然後消失。這樣做是為了避免您的螢幕被所有黏性定位容器的變體弄得雜亂無章。

定位

預設情況下，元素會黏在視窗頂部。您可以設定 position: bottom 選項，將其黏在視窗底部。

<div uk-sticky="position: bottom"></div>
黏在底部
<div class="uk-background-muted uk-height-large">
    <div class="uk-card uk-card-default uk-card-body uk-text-center uk-position-z-index" uk-sticky="position: bottom; end: !.uk-height-large">Stick to the bottom</div>
</div>

開始

若要套用元素應開始黏性定位的偏移量，請新增 start 選項。該值可以是 vh、% 和 px。它支援基本數學運算元 + 和 -。0 的預設值表示元素的頂部邊框和視窗的頂部邊框相交。CSS 選擇器會將開始位置設定為所選元素的底部邊框和元素的頂部邊框。

<!-- Sticks after 200px scrolling -->
<div uk-sticky="start: 200"></div>

<!-- Sticks after scrolling the elements height -->
<div uk-sticky="start: 100%"></div>

<!-- Sticks after 20vh scrolling -->
<div uk-sticky="start: 20vh"></div>

<!-- Sticks after the top of the selected element -->
<div id="my-id">
    <div uk-sticky="start: #my-id"></div>
</div>
200px
100%
20vh
選擇器
<div class="uk-background-muted uk-height-large">

    <div class="uk-child-width-1-4@s" uk-grid>
        <div>
            <div class="uk-card uk-card-default uk-card-body uk-text-center uk-position-z-index" uk-sticky="start: 200; end: !.uk-height-large; offset: 80">200px</div>
        </div>
        <div>
            <div class="uk-card uk-card-default uk-card-body uk-text-center uk-position-z-index" uk-sticky="start: 100%; end: !.uk-height-large; offset: 80">100%</div>
        </div>
        <div>
            <div class="uk-card uk-card-default uk-card-body uk-text-center uk-position-z-index" uk-sticky="start: 20vh; end: !.uk-height-large; offset: 80">20vh</div>
        </div>
        <div>
            <div class="uk-card uk-card-default uk-card-body uk-text-center uk-position-z-index" uk-sticky="start: !.uk-height-large; end: !.uk-height-large + div; offset: 80">Selector</div>
        </div>
    </div>

</div>
<div style="height: 200px"></div>

結束

若要套用元素應停止黏性定位的偏移量，請新增 stop 選項。該值可以是 vh、% 和 px。它支援基本數學運算元 + 和 -。值 0 表示元素的頂部邊框和視窗的頂部邊框相交，如果開始位置也設定為 0，則會導致元素完全不具有黏性定位。CSS 選擇器會將結束位置設定為所選元素的底部邊框和元素的底部邊框。false 會使元素黏性定位到頁面結束。true 會選擇父元素。

<!-- Sticks until 200px scrolling -->
<div uk-sticky="end: 200"></div>

<!-- Sticks until scrolling the elements height -->
<div uk-sticky="end: 100%"></div>

<!-- Sticks until 20vh scrolling -->
<div uk-sticky="end: 20vh"></div>

<!-- Sticks until the bottom of the selected element -->
<div uk-sticky="end: #my-id"></div>
<div id="my-id"></div>

<!-- Sticks until the bottom of its parent container -->
<div>
    <div uk-sticky="end: true"></div>
</div>
200px
100%
20vh
選擇器
<div class="uk-background-muted uk-height-large">

    <div class="uk-child-width-1-4@s" uk-grid>
        <div>
            <div class="uk-card uk-card-default uk-card-body uk-text-center uk-position-z-index" uk-sticky="end: 200; offset: 80">200px</div>
        </div>
        <div>
            <div class="uk-card uk-card-default uk-card-body uk-text-center uk-position-z-index" uk-sticky="end: 100%; offset: 80">100%</div>
        </div>
        <div>
            <div class="uk-card uk-card-default uk-card-body uk-text-center uk-position-z-index" uk-sticky="end: 20vh; offset: 80">20vh</div>
        </div>
        <div>
            <div class="uk-card uk-card-default uk-card-body uk-text-center uk-position-z-index" uk-sticky="end: !.uk-height-large; offset: 80">Selector</div>
        </div>
    </div>

</div>

偏移量

若要設定元素黏性定位時與視窗邊緣的偏移量，請新增 offset 選項。該值可以是 vh、% 和 px。它支援基本數學運算元 + 和 -。

<div uk-sticky="offset: 200"></div>
在頂部下方黏性定位 200px
<div class="uk-background-muted uk-height-large">
    <div class="uk-card uk-card-default uk-card-body uk-text-center uk-position-z-index" uk-sticky="end: !.uk-height-large; offset: 200">Stick 200px below the top</div>
</div>

動畫

從動畫組件新增動畫，以便在設定開始偏移量時，使黏性元素平穩地重新出現。

<div uk-sticky="start: 200; animation: uk-animation-slide-top"></div>
動畫滑入頂部
<div class="uk-background-muted uk-height-large">
    <div class="uk-card uk-card-default uk-card-body uk-text-center uk-position-z-index" uk-sticky="start: 200; end: !.uk-height-large; offset: 80; animation: uk-animation-slide-top">Animation Slide Top</div>
</div>

向上捲動時顯示

您可以使黏性元素僅在向上捲動時顯示，以節省空間。結合動畫，可以獲得非常流暢的體驗。

<div uk-sticky="show-on-up: true"></div>
向上捲動時滑入
<div class="uk-background-muted uk-height-large">
    <div class="uk-card uk-card-default uk-card-body uk-text-center uk-position-z-index" uk-sticky="end: !.uk-height-large; offset: 80; show-on-up: true; animation: uk-animation-slide-top">Slide in on scroll up</div>
</div>

響應式

可以透過將 media 選項套用至屬性並新增適當的視窗寬度來停用不同裝置寬度的黏性定位行為。新增一個像素數值，例如 media: 640，或一個斷點，例如 media: @m。元素將從指定的視窗寬度及其向上具有黏性定位，但在其下方則不會。

<div uk-sticky="media: 640"></div>
僅在視窗大於 640px 時具有黏性定位。
<div class="uk-background-muted uk-height-large">
    <div class="uk-card uk-card-default uk-card-body uk-text-center uk-position-z-index" uk-sticky="end: !.uk-height-large; offset: 80; media: 640">Only be sticky on viewports larger than 640px.</div>
</div>

超大內容

大於視窗的黏性定位內容會向下捲動並黏在視窗底部。變更捲動方向會立即向上捲動黏性定位內容，並變更黏性定位行為以黏在視窗頂部。向下捲動會再次變更行為。

黏性定位 1

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

黏性定位 2

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

黏性定位 3

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

黏性定位 4

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

黏性定位 5

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

標題 1

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

標題 2

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

標題 3

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

標題 4

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

標題 5

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

標題 6

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

標題 7

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

標題 8

Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.

<div id="js-oversized" class="uk-child-width-1-2" uk-grid>
    <div>

        <div class="uk-card uk-card-default uk-card-body uk-position-z-index" uk-sticky="end: #js-oversized; offset: 80">
       
            <h3>Sticky 1</h3>

            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

            <h3>Sticky 2</h3>

            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

            <h3>Sticky 3</h3>

            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

            <h3>Sticky 4</h3>

            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

            <h3>Sticky 5</h3>

            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>
           
        </div>

    </div>
    <div>
        <div class="uk-background-muted uk-padding">

            <h3>Headline 1</h3>

            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

            <h3>Headline 2</h3>

            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

            <h3>Headline 3</h3>

            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

            <h3>Headline 4</h3>

            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

            <h3>Headline 5</h3>

            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

            <h3>Headline 6</h3>

            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

            <h3>Headline 7</h3>

            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

            <h3>Headline 8</h3>

            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum.</p>

        </div>

    </div>
</div>

溢出翻轉

overflow-flip 選項會停用超大內容的黏性定位行為。相反地，如果元素大於視窗，則只會翻轉黏性定位位置。變更捲動方向不會影響黏性定位位置。結合 start 和 end 選項，可以實現兩種很好的黏性定位效果。藉由後續內容覆蓋元素，或藉由先前內容顯示元素。

<!-- Section will be covered by the next section -->
<div uk-sticky="overflow-flip: true; end: 100%"></div>

<div>Some section.</div>

<!-- Section will be revealed by the previous section -->
<div uk-sticky="position: bottom; overflow-flip: true; start: -100%; end: 0"></div>
overflow-flip: true
end: 100%
覆蓋先前的區塊。
顯示下一個區塊。
position: bottom
overflow-flip: true
start: -100%
end: 0
<div class="uk-position-relative uk-position-z-index-zero">
    <div class="uk-background-primary uk-padding uk-flex uk-flex-center uk-flex-middle uk-text-center uk-light uk-height-medium uk-position-z-index-negative" uk-sticky="overflow-flip: true; end: 100%; offset: 80">
        overflow-flip: true<br>
        end: 100%
    </div>
    <div class="uk-background-muted uk-padding uk-flex uk-flex-center uk-flex-middle uk-text-center uk-height-medium">Cover previous section.<br>Reveal next section.</div>
    <div class="uk-background-primary uk-padding uk-flex uk-flex-center uk-flex-middle uk-text-center uk-light uk-height-medium uk-position-z-index-negative" uk-sticky="position: bottom; overflow-flip: true; start: -100%; end: 0">
        position: bottom<br>
        overflow-flip: true<br>
        start: -100%<br>
        end: 0
    </div>
</div>

組件選項

任何這些選項都可以套用至組件屬性。使用分號分隔多個選項。了解更多

選項 值 預設值 描述
position top, bottom top 元素應黏性定位到的位置。
start 長度、CSS 選擇器 0 開始偏移量。該值可以是 vh、% 和 px。它支援基本數學運算元 + 和 -。0 的預設值表示元素的頂部邊框和視窗的頂部邊框相交。CSS 選擇器會將開始位置設定為所選元素的底部邊框和元素的頂部邊框。
end 長度、CSS 選擇器、布林值 false 結束偏移量。該值可以是 vh、% 和 px。它支援基本數學運算元 + 和 -。值 0 表示元素的頂部邊框和視窗的頂部邊框相交，如果開始位置也設定為 0，則會導致元素完全不具有黏性定位。CSS 選擇器會將結束位置設定為所選元素的底部邊框和元素的底部邊框。false 會使元素黏性定位到頁面結束。true 會選擇父元素。
offset 長度 0 黏性定位應固定的偏移量。該值可以是 vh、% 和 px。它支援基本數學運算元 + 和 -。
offset-end 長度 0 如果元素溢出視窗，黏性定位應固定的偏移量。該值可以是 vh、% 和 px。它支援基本數學運算元 + 和 -。
overflow-flip 布林值 false 如果元素溢出視窗並停用溢出捲動，則翻轉黏性定位的位置選項。
animation 字串 false 元素變成黏性定位時要使用的動畫。
cls-active 字串 uk-active 活動類別。
cls-inactive 字串 非活動類別。
show-on-up 布林值 false 僅在向上捲動時顯示黏性定位元素。
media 數字、字串 false 活動狀態的條件 - 作為整數的寬度（例如 640）或斷點（例如 @s、@m、@l、@xl）或任何有效的媒體查詢（例如 (min-width: 900px)）。
target-offset false、長度 false 最初確保黏性定位元素不會透過頁面的位置雜湊覆蓋參照的元素。偏移量由元素在參照元素上方多遠定義。false 會停用此行為。

JavaScript

深入了解JavaScript 組件。

初始化

UIkit.sticky(element, options);

事件

以下事件將在附加此組件的元素上觸發

名稱 描述
active 在元素變成黏性定位後觸發。
inactive 在元素不再是黏性定位後觸發。