手风琴（Accordion）

结合我们的折叠JavaScript插件构建垂直折叠手风琴。

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工作原理

手风琴使用内部折叠使其可折叠。要呈现展开的手风琴，请在.accordion上添加.open类。

此组件的动画效果取决于“首选简化运动媒体”查询。请参阅我们的可访问性文档的简化运动部分。

例子

单击下面的手风琴展开/折叠手风琴内容。

This is the first item's accordion body. It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the .accordion-body, though the transition does limit overflow.

This is the second item's accordion body. It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the .accordion-body, though the transition does limit overflow.

This is the third item's accordion body. It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the .accordion-body, though the transition does limit overflow. 
<div class="accordion" id="accordionExample">
        <div class="accordion-item">
        <h2 class="accordion-header" id="headingOne">
        <button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
          Accordion Item #1
        </button>
        </h2>
        <div id="collapseOne" class="accordion-collapse collapse show" aria-labelledby="headingOne" data-bs-parent="#accordionExample">
        <div class="accordion-body">
          <strong>This is the first item's accordion body.</strong> It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the <code>.accordion-body</code>, though the transition does limit overflow.
        </div>
        </div>
        </div>
        <div class="accordion-item">
        <h2 class="accordion-header" id="headingTwo">
        <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
          Accordion Item #2
        </button>
        </h2>
        <div id="collapseTwo" class="accordion-collapse collapse" aria-labelledby="headingTwo" data-bs-parent="#accordionExample">
        <div class="accordion-body">
          <strong>This is the second item's accordion body.</strong> It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the <code>.accordion-body</code>, though the transition does limit overflow.
        </div>
        </div>
        </div>
        <div class="accordion-item">
        <h2 class="accordion-header" id="headingThree">
        <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#collapseThree" aria-expanded="false" aria-controls="collapseThree">
          Accordion Item #3
        </button>
        </h2>
        <div id="collapseThree" class="accordion-collapse collapse" aria-labelledby="headingThree" data-bs-parent="#accordionExample">
        <div class="accordion-body">
          <strong>This is the third item's accordion body.</strong> It is hidden by default, until the collapse plugin adds the appropriate classes that we use to style each element. These classes control the overall appearance, as well as the showing and hiding via CSS transitions. You can modify any of this with custom CSS or overriding our default variables. It's also worth noting that just about any HTML can go within the <code>.accordion-body</code>, though the transition does limit overflow.
        </div>
        </div>
        </div>
        </div>

紧邻

.accordion-flush删除默认背景色、一些边框和一些圆角，以使手风琴与其父容器紧邻。

Placeholder content for this accordion, which is intended to demonstrate the .accordion-flush class. This is the first item's accordion body.

Placeholder content for this accordion, which is intended to demonstrate the .accordion-flush class. This is the second item's accordion body. Let's imagine this being filled with some actual content.

Placeholder content for this accordion, which is intended to demonstrate the .accordion-flush class. This is the third item's accordion body. Nothing more exciting happening here in terms of content, but just filling up the space to make it look, at least at first glance, a bit more representative of how this would look in a real-world application. 
<div class="accordion accordion-flush" id="accordionFlushExample">
        <div class="accordion-item">
        <h2 class="accordion-header" id="flush-headingOne">
        <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#flush-collapseOne" aria-expanded="false" aria-controls="flush-collapseOne">
          Accordion Item #1
        </button>
        </h2>
        <div id="flush-collapseOne" class="accordion-collapse collapse" aria-labelledby="flush-headingOne" data-bs-parent="#accordionFlushExample">
        <div class="accordion-body">Placeholder content for this accordion, which is intended to demonstrate the <code>.accordion-flush</code> class. This is the first item's accordion body.</div>
        </div>
        </div>
        <div class="accordion-item">
        <h2 class="accordion-header" id="flush-headingTwo">
        <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#flush-collapseTwo" aria-expanded="false" aria-controls="flush-collapseTwo">
          Accordion Item #2
        </button>
        </h2>
        <div id="flush-collapseTwo" class="accordion-collapse collapse" aria-labelledby="flush-headingTwo" data-bs-parent="#accordionFlushExample">
        <div class="accordion-body">Placeholder content for this accordion, which is intended to demonstrate the <code>.accordion-flush</code> class. This is the second item's accordion body. Let's imagine this being filled with some actual content.</div>
        </div>
        </div>
        <div class="accordion-item">
        <h2 class="accordion-header" id="flush-headingThree">
        <button class="accordion-button collapsed" type="button" data-bs-toggle="collapse" data-bs-target="#flush-collapseThree" aria-expanded="false" aria-controls="flush-collapseThree">
          Accordion Item #3
        </button>
        </h2>
        <div id="flush-collapseThree" class="accordion-collapse collapse" aria-labelledby="flush-headingThree" data-bs-parent="#accordionFlushExample">
        <div class="accordion-body">Placeholder content for this accordion, which is intended to demonstrate the <code>.accordion-flush</code> class. This is the third item's accordion body. Nothing more exciting happening here in terms of content, but just filling up the space to make it look, at least at first glance, a bit more representative of how this would look in a real-world application.</div>
        </div>
        </div>
        </div>

辅助功能

有关详细信息，请阅读组件-折叠中关于辅助功能部分。

Sass

Variables

$accordion-padding-y:                     1rem;
        $accordion-padding-x:                     1.25rem;
        $accordion-color:                         $body-color;
        $accordion-bg:                            $body-bg;
        $accordion-border-width:                  $border-width;
        $accordion-border-color:                  rgba($black, .125);
        $accordion-border-radius:                 $border-radius;
        $accordion-inner-border-radius:           subtract($accordion-border-radius, $accordion-border-width);
        
        $accordion-body-padding-y:                $accordion-padding-y;
        $accordion-body-padding-x:                $accordion-padding-x;
        
        $accordion-button-padding-y:              $accordion-padding-y;
        $accordion-button-padding-x:              $accordion-padding-x;
        $accordion-button-color:                  $accordion-color;
        $accordion-button-bg:                     $accordion-bg;
        $accordion-transition:                    $btn-transition, border-radius .15s ease;
        $accordion-button-active-bg:              tint-color($component-active-bg, 90%);
        $accordion-button-active-color:           shade-color($primary, 10%);
        
        $accordion-button-focus-border-color:     $input-focus-border-color;
        $accordion-button-focus-box-shadow:       $btn-focus-box-shadow;
        
        $accordion-icon-width:                    1.25rem;
        $accordion-icon-color:                    $accordion-color;
        $accordion-icon-active-color:             $accordion-button-active-color;
        $accordion-icon-transition:               transform .2s ease-in-out;
        $accordion-icon-transform:                rotate(180deg);
        
        $accordion-button-icon:         url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='#{$accordion-icon-color}'><path fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/></svg>");
        $accordion-button-active-icon:  url("data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 16 16' fill='#{$accordion-icon-active-color}'><path fill-rule='evenodd' d='M1.646 4.646a.5.5 0 0 1 .708 0L8 10.293l5.646-5.647a.5.5 0 0 1 .708.708l-6 6a.5.5 0 0 1-.708 0l-6-6a.5.5 0 0 1 0-.708z'/></svg>");
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