我想在使用折疊時(shí)交換，在使用foreach循環(huán)時(shí)沒有每個(gè)圖標(biāo)同時(shí)切換。fa fa-plusfa fa-minus這是我的代碼演示。<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" /><link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/4.7.0/css/font-awesome.min.css" /><script src="https://code.jquery.com/jquery-3.4.1.slim.min.js"></script><script src="https://cdn.jsdelivr.net/npm/popper.js@1.16.0/dist/umd/popper.min.js"></script><script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js"></script><div class="container h-100">    <div class="row no-gutters border-0 rounded align-items-center mt-3">        <div class="col-sm-4">demo 1</div>        <div class="col-sm-4">demo 1</div>        <div class="col-sm-3">demo 1</div>        <div class="col-sm-1 ">            <a class="fa fa-plus" data-toggle="collapse" href="#collapse1" aria-expanded="true" aria-controls="collapse1"></a>        </div>    </div><!--row-->    <div class="collapse" id="collapse1">        <div class="row no-gutters border-0 rounded align-items-center mt-3">            <div class="col-sm-4">demo 1</div>            <div class="col-sm-4">demo 1</div>            <div class="col-sm-4">demo 1</div>        </div><!--collapse-->    </div>    <div class="row no-gutters border-0 rounded align-items-center mt-3">        <div class="col-sm-4">demo 2</div>        <div class="col-sm-4">demo 2</div>        <div class="col-sm-3">demo 2</div>        <div class="col-sm-1 ">            <a class="fa fa-plus" data-toggle="collapse" href="#collapse2" aria-expanded="true" aria-controls="collapse2"></a>        </div>    </div><!--row-->https://codepen.io/benwhittaker25/pen/rNVWyby在引導(dǎo) 4.4 中實(shí)現(xiàn)此目的的最佳方法是什么？