列表组

列表组是用于显示一系列内容的灵活而强大的组件。修改和扩展它们以支持其中的几乎任何内容。

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基本示例

最基本的列表组是包含列表项和正确类的无序列表。使用下面的选项构建它，或者根据需要使用您自己的 CSS。

An item
A second item
A third item
A fourth item
And a fifth one

html

<ul class="list-group">
  <li class="list-group-item">An item</li>
  <li class="list-group-item">A second item</li>
  <li class="list-group-item">A third item</li>
  <li class="list-group-item">A fourth item</li>
  <li class="list-group-item">And a fifth one</li>
</ul>

活动项

将.active添加到.list-group-item以指示当前活动的选择。

An active item
A second item
A third item
A fourth item
And a fifth one

html

<ul class="list-group">
  <li class="list-group-item active" aria-current="true">An active item</li>
  <li class="list-group-item">A second item</li>
  <li class="list-group-item">A third item</li>
  <li class="list-group-item">A fourth item</li>
  <li class="list-group-item">And a fifth one</li>
</ul>

禁用项

将.disabled添加到.list-group-item以使其_显示_禁用。请注意，一些带有.disabled的元素也需要自定义 JavaScript 来完全禁用其点击事件（例如链接）。

A disabled item
A second item
A third item
A fourth item
And a fifth one

html

<ul class="list-group">
  <li class="list-group-item disabled" aria-disabled="true">A disabled item</li>
  <li class="list-group-item">A second item</li>
  <li class="list-group-item">A third item</li>
  <li class="list-group-item">A fourth item</li>
  <li class="list-group-item">And a fifth one</li>
</ul>

链接和按钮

使用 <a> 或 <button>通过添加.list-group-item-action来创建具有悬停、禁用和活动状态的 actionable 列表组项。我们将这些伪类分开，以确保由非交互式元素（如<li>或<div>）组成的列表组不会提供点击或点击提示。

请确保不要在此处使用标准的.btn 类。

The current link item A second link item A third link item A fourth link item A disabled link item

html

<div class="list-group">
  <a href="#" class="list-group-item list-group-item-action active" aria-current="true">
    The current link item
  </a>
  <a href="#" class="list-group-item list-group-item-action">A second link item</a>
  <a href="#" class="list-group-item list-group-item-action">A third link item</a>
  <a href="#" class="list-group-item list-group-item-action">A fourth link item</a>
  <a class="list-group-item list-group-item-action disabled">A disabled link item</a>
</div>

使用<button>，您还可以使用disabled属性而不是.disabled类。可悲的是，<a>不支持禁用属性。

html

<div class="list-group">
  <button type="button" class="list-group-item list-group-item-action active" aria-current="true">
    The current button
  </button>
  <button type="button" class="list-group-item list-group-item-action">A second button item</button>
  <button type="button" class="list-group-item list-group-item-action">A third button item</button>
  <button type="button" class="list-group-item list-group-item-action">A fourth button item</button>
  <button type="button" class="list-group-item list-group-item-action" disabled>A disabled button item</button>
</div>

冲洗（Flush）

添加.list-group-flush以删除一些边框和圆角，以在父容器（例如卡片）中逐边呈现列表组项。

An item
A second item
A third item
A fourth item
And a fifth one

html

<ul class="list-group list-group-flush">
  <li class="list-group-item">An item</li>
  <li class="list-group-item">A second item</li>
  <li class="list-group-item">A third item</li>
  <li class="list-group-item">A fourth item</li>
  <li class="list-group-item">And a fifth one</li>
</ul>

编号

添加.list-group-numbered修饰符类（并可选择使用<ol>元素）以选择加入编号列表组项。数字是通过 CSS 生成的（与 <ol>的默认浏览器样式相反），以便更好地放置在列表组项中并允许更好的自定义。

数字是通过 <ol>上的counter-reset生成的，然后设置样式并在<li> 上放置带有counter-increment和content的::before伪元素。

A list item
A list item
A list item

html

<ol class="list-group list-group-numbered">
  <li class="list-group-item">A list item</li>
  <li class="list-group-item">A list item</li>
  <li class="list-group-item">A list item</li>
</ol>

这些也适用于自定义内容。

Subheading
Content for list item
14
Subheading
Content for list item
14
Subheading
Content for list item
14

html

<ol class="list-group list-group-numbered">
  <li class="list-group-item d-flex justify-content-between align-items-start">
    <div class="ms-2 me-auto">
      <div class="fw-bold">Subheading</div>
      Content for list item
    </div>
    <span class="badge bg-primary rounded-pill">14</span>
  </li>
  <li class="list-group-item d-flex justify-content-between align-items-start">
    <div class="ms-2 me-auto">
      <div class="fw-bold">Subheading</div>
      Content for list item
    </div>
    <span class="badge bg-primary rounded-pill">14</span>
  </li>
  <li class="list-group-item d-flex justify-content-between align-items-start">
    <div class="ms-2 me-auto">
      <div class="fw-bold">Subheading</div>
      Content for list item
    </div>
    <span class="badge bg-primary rounded-pill">14</span>
  </li>
</ol>

水平

添加.list-group-horizontal以在所有断点中将列表组项的布局从垂直更改为水平。或者，选择一个响应式变体.list-group-horizontal-{sm|md|lg|xl|xxl}，使列表组从该断点的min-width开始水平。当前水平列表组不能与刷新列表组组合。

专业提示： 想要水平时等宽的列表组项目？将.flex-fill添加到每个列表组项。

An item
A second item
A third item

An item
A second item
A third item

An item
A second item
A third item

An item
A second item
A third item

An item
A second item
A third item

An item
A second item
A third item

html

<ul class="list-group list-group-horizontal">
  <li class="list-group-item">An item</li>
  <li class="list-group-item">A second item</li>
  <li class="list-group-item">A third item</li>
</ul>
<ul class="list-group list-group-horizontal-sm">
  <li class="list-group-item">An item</li>
  <li class="list-group-item">A second item</li>
  <li class="list-group-item">A third item</li>
</ul>
<ul class="list-group list-group-horizontal-md">
  <li class="list-group-item">An item</li>
  <li class="list-group-item">A second item</li>
  <li class="list-group-item">A third item</li>
</ul>
<ul class="list-group list-group-horizontal-lg">
  <li class="list-group-item">An item</li>
  <li class="list-group-item">A second item</li>
  <li class="list-group-item">A third item</li>
</ul>
<ul class="list-group list-group-horizontal-xl">
  <li class="list-group-item">An item</li>
  <li class="list-group-item">A second item</li>
  <li class="list-group-item">A third item</li>
</ul>
<ul class="list-group list-group-horizontal-xxl">
  <li class="list-group-item">An item</li>
  <li class="list-group-item">A second item</li>
  <li class="list-group-item">A third item</li>
</ul>

变体

注意！ 从 v5.3.0 开始，list-group-item-variant()Sass mixin 已被弃用。列表组项变体现在在 Sass 循环中覆盖了其 CSS 变量。

使用上下文类设置具有有状态背景和颜色的列表项样式。

A simple default list group item
A simple primary list group item
A simple secondary list group item
A simple success list group item
A simple danger list group item
A simple warning list group item
A simple info list group item
A simple light list group item
A simple dark list group item

html

<ul class="list-group">
  <li class="list-group-item">A simple default list group item</li>

  <li class="list-group-item list-group-item-primary">A simple primary list group item</li>
  <li class="list-group-item list-group-item-secondary">A simple secondary list group item</li>
  <li class="list-group-item list-group-item-success">A simple success list group item</li>
  <li class="list-group-item list-group-item-danger">A simple danger list group item</li>
  <li class="list-group-item list-group-item-warning">A simple warning list group item</li>
  <li class="list-group-item list-group-item-info">A simple info list group item</li>
  <li class="list-group-item list-group-item-light">A simple light list group item</li>
  <li class="list-group-item list-group-item-dark">A simple dark list group item</li>
</ul>

对于链接和按钮

上下文类还可以使用<a>和<button>元素的.list-group-item-action。请注意，此处添加了前面示例中不存在的悬停样式。还支持.active状态;应用它以指示上下文列表组项上的活动选择。

A simple default list group item A simple primary list group item A simple secondary list group item A simple success list group item A simple danger list group item A simple warning list group item A simple info list group item A simple light list group item A simple dark list group item

html

<div class="list-group">
  <a href="#" class="list-group-item list-group-item-action">A simple default list group item</a>

  <a href="#" class="list-group-item list-group-item-action list-group-item-primary">A simple primary list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-secondary">A simple secondary list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-success">A simple success list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-danger">A simple danger list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-warning">A simple warning list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-info">A simple info list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-light">A simple light list group item</a>
  <a href="#" class="list-group-item list-group-item-action list-group-item-dark">A simple dark list group item</a>
</div>

辅助功能提示： 使用颜色添加含义仅提供视觉指示，不会传达给屏幕阅读器等辅助技术的用户。请确保从内容本身（例如，可见文本）中可以明显看出含义，或者通过其他方式包含含义，例如使用.visually-hidden 类隐藏的附加文本。

带徽章（With badges）

在某些实用程序的帮助下，向任何列表组项添加徽章以显示未读计数、活动等。

A list item 14
A second list item 2
A third list item 1

html

<ul class="list-group">
  <li class="list-group-item d-flex justify-content-between align-items-center">
    A list item
    <span class="badge bg-primary rounded-pill">14</span>
  </li>
  <li class="list-group-item d-flex justify-content-between align-items-center">
    A second list item
    <span class="badge bg-primary rounded-pill">2</span>
  </li>
  <li class="list-group-item d-flex justify-content-between align-items-center">
    A third list item
    <span class="badge bg-primary rounded-pill">1</span>
  </li>
</ul>

自定义内容

在 flexbox utilities 的帮助下，添加几乎任何 HTML，即使是像下面这样的链表组。

List group item heading

3 days ago

Some placeholder content in a paragraph.

And some small print.

List group item heading

3 days ago

Some placeholder content in a paragraph.

And some muted small print.

List group item heading

3 days ago

Some placeholder content in a paragraph.

And some muted small print.

html

<div class="list-group">
  <a href="#" class="list-group-item list-group-item-action active" aria-current="true">
    <div class="d-flex w-100 justify-content-between">
      <h5 class="mb-1">List group item heading</h5>
      <small>3 days ago</small>
    </div>
    <p class="mb-1">Some placeholder content in a paragraph.</p>
    <small>And some small print.</small>
  </a>
  <a href="#" class="list-group-item list-group-item-action">
    <div class="d-flex w-100 justify-content-between">
      <h5 class="mb-1">List group item heading</h5>
      <small class="text-body-secondary">3 days ago</small>
    </div>
    <p class="mb-1">Some placeholder content in a paragraph.</p>
    <small class="text-body-secondary">And some muted small print.</small>
  </a>
  <a href="#" class="list-group-item list-group-item-action">
    <div class="d-flex w-100 justify-content-between">
      <h5 class="mb-1">List group item heading</h5>
      <small class="text-body-secondary">3 days ago</small>
    </div>
    <p class="mb-1">Some placeholder content in a paragraph.</p>
    <small class="text-body-secondary">And some muted small print.</small>
  </a>
</div>

复选框和单选按钮

将 Bootstrap 的复选框和单选按钮放在列表组项中，并根据需要进行自定义。您可以在没有 <label> 的情况下使用它们，但请记住包含 aria-label属性和值以实现可访问性。

First checkbox
Second checkbox
Third checkbox

html

<ul class="list-group">
  <li class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="" id="firstCheckbox">
    <label class="form-check-label" for="firstCheckbox">First checkbox</label>
  </li>
  <li class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="" id="secondCheckbox">
    <label class="form-check-label" for="secondCheckbox">Second checkbox</label>
  </li>
  <li class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="" id="thirdCheckbox">
    <label class="form-check-label" for="thirdCheckbox">Third checkbox</label>
  </li>
</ul>

First radio
Second radio
Third radio

html

<ul class="list-group">
  <li class="list-group-item">
    <input class="form-check-input me-1" type="radio" name="listGroupRadio" value="" id="firstRadio" checked>
    <label class="form-check-label" for="firstRadio">First radio</label>
  </li>
  <li class="list-group-item">
    <input class="form-check-input me-1" type="radio" name="listGroupRadio" value="" id="secondRadio">
    <label class="form-check-label" for="secondRadio">Second radio</label>
  </li>
  <li class="list-group-item">
    <input class="form-check-input me-1" type="radio" name="listGroupRadio" value="" id="thirdRadio">
    <label class="form-check-label" for="thirdRadio">Third radio</label>
  </li>
</ul>

您可以在上使用 <label> 上的.stretched-link使整个列表组项可单击。

First checkbox
Second checkbox
Third checkbox

html

<ul class="list-group">
  <li class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="" id="firstCheckboxStretched">
    <label class="form-check-label stretched-link" for="firstCheckboxStretched">First checkbox</label>
  </li>
  <li class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="" id="secondCheckboxStretched">
    <label class="form-check-label stretched-link" for="secondCheckboxStretched">Second checkbox</label>
  </li>
  <li class="list-group-item">
    <input class="form-check-input me-1" type="checkbox" value="" id="thirdCheckboxStretched">
    <label class="form-check-label stretched-link" for="thirdCheckboxStretched">Third checkbox</label>
  </li>
</ul>

CSS

变量

Added in v5.2.0

作为 Bootstrap 不断发展的 CSS 变量方法的一部分，列表组现在使用.list-group上的本地 CSS 变量来增强实时自定义。CSS 变量的值是通过 Sass 设置的，因此仍然支持 Sass 自定义。

scss/_list-group.scss

--#{$prefix}list-group-color: #{$list-group-color};
--#{$prefix}list-group-bg: #{$list-group-bg};
--#{$prefix}list-group-border-color: #{$list-group-border-color};
--#{$prefix}list-group-border-width: #{$list-group-border-width};
--#{$prefix}list-group-border-radius: #{$list-group-border-radius};
--#{$prefix}list-group-item-padding-x: #{$list-group-item-padding-x};
--#{$prefix}list-group-item-padding-y: #{$list-group-item-padding-y};
--#{$prefix}list-group-action-color: #{$list-group-action-color};
--#{$prefix}list-group-action-hover-color: #{$list-group-action-hover-color};
--#{$prefix}list-group-action-hover-bg: #{$list-group-hover-bg};
--#{$prefix}list-group-action-active-color: #{$list-group-action-active-color};
--#{$prefix}list-group-action-active-bg: #{$list-group-action-active-bg};
--#{$prefix}list-group-disabled-color: #{$list-group-disabled-color};
--#{$prefix}list-group-disabled-bg: #{$list-group-disabled-bg};
--#{$prefix}list-group-active-color: #{$list-group-active-color};
--#{$prefix}list-group-active-bg: #{$list-group-active-bg};
--#{$prefix}list-group-active-border-color: #{$list-group-active-border-color};

Sass 变量

scss/_variables.scss

$list-group-color:                  var(--#{$prefix}body-color);
$list-group-bg:                     var(--#{$prefix}body-bg);
$list-group-border-color:           var(--#{$prefix}border-color);
$list-group-border-width:           var(--#{$prefix}border-width);
$list-group-border-radius:          var(--#{$prefix}border-radius);

$list-group-item-padding-y:         $spacer * .5;
$list-group-item-padding-x:         $spacer;
// fusv-disable
$list-group-item-bg-scale:          -80%; // Deprecated in v5.3.0
$list-group-item-color-scale:       40%; // Deprecated in v5.3.0
// fusv-enable

$list-group-hover-bg:               var(--#{$prefix}tertiary-bg);
$list-group-active-color:           $component-active-color;
$list-group-active-bg:              $component-active-bg;
$list-group-active-border-color:    $list-group-active-bg;

$list-group-disabled-color:         var(--#{$prefix}secondary-color);
$list-group-disabled-bg:            $list-group-bg;

$list-group-action-color:           var(--#{$prefix}secondary-color);
$list-group-action-hover-color:     var(--#{$prefix}emphasis-color);

$list-group-action-active-color:    var(--#{$prefix}body-color);
$list-group-action-active-bg:       var(--#{$prefix}secondary-bg);

Sass 混合

在 v5.3.0 版本中弃用

与$theme-colors结合使用，为.list-group-item生成上下文变体类。

scss/mixins/_list-group.scss

@mixin list-group-item-variant($state, $background, $color) {
  .list-group-item-#{$state} {
    color: $color;
    background-color: $background;

    &.list-group-item-action {
      &:hover,
      &:focus {
        color: $color;
        background-color: shade-color($background, 10%);
      }

      &.active {
        color: $white;
        background-color: $color;
        border-color: $color;
      }
    }
  }
}

Sass loop

生成重写 CSS 变量的修饰符类的循环。

scss/_list-group.scss

// List group contextual variants
//
// Add modifier classes to change text and background color on individual items.
// Organizationally, this must come after the `:hover` states.

@each $state in map-keys($theme-colors) {
  .list-group-item-#{$state} {
    --#{$prefix}list-group-color: var(--#{$prefix}#{$state}-text-emphasis);
    --#{$prefix}list-group-bg: var(--#{$prefix}#{$state}-bg-subtle);
    --#{$prefix}list-group-border-color: var(--#{$prefix}#{$state}-border-subtle);
    --#{$prefix}list-group-action-hover-color: var(--#{$prefix}emphasis-color);
    --#{$prefix}list-group-action-hover-bg: var(--#{$prefix}#{$state}-border-subtle);
    --#{$prefix}list-group-action-active-color: var(--#{$prefix}emphasis-color);
    --#{$prefix}list-group-action-active-bg: var(--#{$prefix}#{$state}-border-subtle);
    --#{$prefix}list-group-active-color: var(--#{$prefix}#{$state}-bg-subtle);
    --#{$prefix}list-group-active-bg: var(--#{$prefix}#{$state}-text-emphasis);
    --#{$prefix}list-group-active-border-color: var(--#{$prefix}#{$state}-text-emphasis);
  }
}

JavaScript 行为

使用选项卡 JavaScript 插件（单独包含或通过编译的bootstrap.js文件包含它）来扩展我们的列表组以创建本地内容的选项卡窗格。

Home Profile Messages Settings

Some placeholder content in a paragraph relating to "Home". And some more content, used here just to pad out and fill this tab panel. In production, you would obviously have more real content here. And not just text. It could be anything, really. Text, images, forms.

Some placeholder content in a paragraph relating to "Profile". And some more content, used here just to pad out and fill this tab panel. In production, you would obviously have more real content here. And not just text. It could be anything, really. Text, images, forms.

Some placeholder content in a paragraph relating to "Messages". And some more content, used here just to pad out and fill this tab panel. In production, you would obviously have more real content here. And not just text. It could be anything, really. Text, images, forms.

Some placeholder content in a paragraph relating to "Settings". And some more content, used here just to pad out and fill this tab panel. In production, you would obviously have more real content here. And not just text. It could be anything, really. Text, images, forms.

<div class="row">
  <div class="col-4">
    <div class="list-group" id="list-tab" role="tablist">
      <a class="list-group-item list-group-item-action active" id="list-home-list" data-bs-toggle="list" href="#list-home" role="tab" aria-controls="list-home">Home</a>
      <a class="list-group-item list-group-item-action" id="list-profile-list" data-bs-toggle="list" href="#list-profile" role="tab" aria-controls="list-profile">Profile</a>
      <a class="list-group-item list-group-item-action" id="list-messages-list" data-bs-toggle="list" href="#list-messages" role="tab" aria-controls="list-messages">Messages</a>
      <a class="list-group-item list-group-item-action" id="list-settings-list" data-bs-toggle="list" href="#list-settings" role="tab" aria-controls="list-settings">Settings</a>
    </div>
  </div>
  <div class="col-8">
    <div class="tab-content" id="nav-tabContent">
      <div class="tab-pane fade show active" id="list-home" role="tabpanel" aria-labelledby="list-home-list">...</div>
      <div class="tab-pane fade" id="list-profile" role="tabpanel" aria-labelledby="list-profile-list">...</div>
      <div class="tab-pane fade" id="list-messages" role="tabpanel" aria-labelledby="list-messages-list">...</div>
      <div class="tab-pane fade" id="list-settings" role="tabpanel" aria-labelledby="list-settings-list">...</div>
    </div>
  </div>
</div>

使用数据属性

您可以通过简单地指定data-bs-toggle="list"或元素来激活列表组导航而无需编写任何JavaScript。在.list-group-item上使用这些数据属性。

<div role="tabpanel">
  <!-- List group -->
  <div class="list-group" id="myList" role="tablist">
    <a class="list-group-item list-group-item-action active" data-bs-toggle="list" href="#home" role="tab">Home</a>
    <a class="list-group-item list-group-item-action" data-bs-toggle="list" href="#profile" role="tab">Profile</a>
    <a class="list-group-item list-group-item-action" data-bs-toggle="list" href="#messages" role="tab">Messages</a>
    <a class="list-group-item list-group-item-action" data-bs-toggle="list" href="#settings" role="tab">Settings</a>
  </div>

  <!-- Tab panes -->
  <div class="tab-content">
    <div class="tab-pane active" id="home" role="tabpanel">...</div>
    <div class="tab-pane" id="profile" role="tabpanel">...</div>
    <div class="tab-pane" id="messages" role="tabpanel">...</div>
    <div class="tab-pane" id="settings" role="tabpanel">...</div>
  </div>
</div>

通过 JavaScript

通过 JavaScript 启用可选项卡列表项（每个列表项需要单独激活）：

const triggerTabList = document.querySelectorAll('#myTab a')
triggerTabList.forEach(triggerEl => {
  const tabTrigger = new bootstrap.Tab(triggerEl)

  triggerEl.addEventListener('click', event => {
    event.preventDefault()
    tabTrigger.show()
  })
})

可以通过多种方式激活单个列表项：

const triggerEl = document.querySelector('#myTab a[href="#profile"]')
bootstrap.Tab.getInstance(triggerEl).show() // Select tab by name

const triggerFirstTabEl = document.querySelector('#myTab li:first-child a')
bootstrap.Tab.getInstance(triggerFirstTabEl).show() // Select first tab

淡入淡出效果

要使选项卡面板淡入，请将.fade添加到每个.tab-pane。第一个选项卡窗格还必须具有.show 才能使初始内容可见。

<div class="tab-content">
  <div class="tab-pane fade show active" id="home" role="tabpanel">...</div>
  <div class="tab-pane fade" id="profile" role="tabpanel">...</div>
  <div class="tab-pane fade" id="messages" role="tabpanel">...</div>
  <div class="tab-pane fade" id="settings" role="tabpanel">...</div>
</div>

方法

所有 API 方法都是异步的，并且会启动转换。 它们在转换开始后但在转换结束之前立即返回给调用方。此外，对转换组件的方法调用将被忽略。在我们的 JavaScript 文档中了解更多信息。

将内容激活为选项卡元素。

可以使用构造函数创建选项卡实例，例如：

const bsTab = new bootstrap.Tab('#myTab')

方法	描述
`dispose`	销毁元素的制表符。
`getInstance`	静态方法，允许您获取与 DOM 元素关联的选项卡实例，您可以像这样使用它： `bootstrap.Tab.getInstance(element)`.
`getOrCreateInstance`	静态方法，返回与 DOM 元素关联的选项卡实例，或在未初始化的情况下创建一个新实例。你可以像这样使用它： `bootstrap.Tab.getOrCreateInstance(element)`.
`show`	选择给定的选项卡并显示其关联的窗格。以前选择的任何其他选项卡将变为未选中状态，其关联的窗格将被隐藏。在选项卡窗格实际显示之前（即在`shown.bs.tab`事件发生之前）返回到调用方。

事件

显示新选项卡时，事件将按以下顺序触发：

hide.bs.tab （在当前活动选项卡上）
show.bs.tab （在“要显示”选项卡上）
hidden.bs.tab（在上一个活动选项卡上，与hide.bs.tab事件相同）
shown.bs.tab （在新活动的刚刚显示的选项卡上，与show.bs.tab事件相同）

如果没有选项卡已处于活动状态，则不会触发hide.bs.tab和hidden.bs.tab事件。

事件类型	描述
`hide.bs.tab`	当要显示新选项卡时，将触发此事件（因此将隐藏以前的活动选项卡）。使用`event.target`和`event.relatedTarget`分别定位当前活动选项卡和即将处于活动状态的新选项卡。
`hidden.bs.tab`	此事件在显示新选项卡后触发（因此隐藏了上一个活动选项卡）。使用`event.target`和`event.relatedTarget` 分别定位上一个活动选项卡和新的活动选项卡。
`show.bs.tab`	此事件在选项卡显示时触发，但在显示新选项卡之前触发。使用`event.target`和`event.relatedTarget`分别定位活动选项卡和上一个活动选项卡（如果可用）。
`shown.bs.tab`	此事件在显示选项卡后在选项卡显示时触发。使用`event.target`和`event.relatedTarget`分别定位活动选项卡和上一个活动选项卡（如果可用）。

const tabElms = document.querySelectorAll('a[data-bs-toggle="list"]')
tabElms.forEach(tabElm => {
  tabElm.addEventListener('shown.bs.tab', event => {
    event.target // newly activated tab
    event.relatedTarget // previous active tab
  })
})