Bootstrap4手风琴将保持打开状态

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我在Bootstrap 3.7.7上进行了这项工作。更新至4.1.1。我的手风琴坏了。他们不会保持开放。该链接起作用，并且卡看起来像它将打开，然后自行关闭或消失。就像我说过的，今天上午在3.7.7上一切正常，但是想在我继续前进之前达到4.1.1。

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                        Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute,
                        non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch
                        3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda
                        shoreditch et.
                    </p>

                    <p>
                        Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt
                        sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer
                        farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them
                        accusamus labore.
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                        Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute,
                        non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch
                        3 wolf moon tempor, sunt aliqua put a bird on it squid single-origin coffee nulla assumenda
                        shoreditch et.
                    </p>

                    <p>
                        Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt
                        sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer
                        farm-to-table, raw denim aesthetic synth nesciunt you probably haven't heard of them
                        accusamus labore.
                    </p>
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