如何在Bootstrap中保持多个折叠打开

 <div class="accordion">
        <div class="item">
            <div class="accordion-header" style="background-color: #F9F9F9" id="accordionExample1">
                <button class="btn" type="button" data-toggle="collapse" data-target="#accordion1" aria-expanded="true" style="font-size: 16px;font-weight: bold;color: #1F1F1F;">
                  一级  <span style="color: #FF0000;">*</span>
                </button>
            </div>
            <div id="accordion1" class="accordion-body collapse show" data-parent="#accordionExample1">
                <div class="accordion-content" style="padding: 20px 10px 20px 10px;">
                    <div id="setupT1" class="wide-block pt-2 pb-2" style="padding: 0 0 0 0 !important;"></div>
                </div>
            </div>
        </div>

        <div class="item">
            <div class="accordion-header" style="background-color: #F9F9F9" id="accordionExample2">
                <button class="btn" type="button" data-toggle="collapse" data-target="#accordion2" aria-expanded="true"  style="font-size: 16px;font-weight: bold;color: #1F1F1F">
                    二级
                </button>
            </div>
            <div id="accordion2" class="accordion-body collapse show" data-parent="#accordionExample2" style="">
                <div class="accordion-content" style="padding: 20px 10px 20px 10px;">
                    <div id="setupT2" class="wide-block pt-2 pb-2" style="padding: 0 0 0 0 !important;"></div>
                </div>
            </div>
        </div>

        <div class="item">
            <div class="accordion-header" style="background-color: #F9F9F9" id="accordionExample3">
                <button class="btn" type="button" data-toggle="collapse" data-target="#accordion3" aria-expanded="true"  style="font-size: 16px;font-weight: bold;color: #1F1F1F">
                    三级
                </button>
            </div>
            <div id="accordion3" class="accordion-body collapse show" data-parent="#accordionExample3" style="">
                <div class="accordion-content" style="padding: 20px 10px 20px 10px;">
                    <div id="setupT3" class="wide-block pt-2 pb-2" style="padding: 0 0 0 0 !important;"></div>
                </div>
            </div>
        </div>

        <div class="item">
            <div class="accordion-header" style="background-color: #F9F9F9" id="accordionExample4">
                <button class="btn" type="button" data-toggle="collapse" data-target="#accordion4" aria-expanded="true"  style="font-size: 16px;font-weight: bold;color: #1F1F1F">
                    四级
                </button>
            </div>
            <div id="accordion4" class="accordion-body collapse show" data-parent="#accordionExample4" style="">
                <div class="accordion-content" style="padding: 20px 10px 20px 10px;">
                    <div id="setupT4" class="wide-block pt-2 pb-2" style="padding: 0 0 0 0 !important;"></div>
                </div>
            </div>
        </div>

        <div class="item">
            <div class="accordion-header" style="background-color: #F9F9F9" id="accordionExample5">
                <button class="btn" type="button" data-toggle="collapse" data-target="#accordion5" aria-expanded="true"  style="font-size: 16px;font-weight: bold;color: #1F1F1F">
                    五级
                </button>
            </div>
            <div id="accordion5" class="accordion-body collapse show" data-parent="#accordionExample5" style="">
                <div class="accordion-content" style="padding: 20px 10px 20px 10px;">
                    <div id="setupT5" class="wide-block pt-2 pb-2" style="padding: 0 0 0 0 !important;"></div>
                </div>
            </div>
        </div>
    </div>
</div>


展示效果如下：