再次单击时关闭javascript选项卡

Question

我有带有选项卡的部分，需要再次单击该选项卡时关闭这些选项卡。我认为这需要切换方法，但是我不确定该怎么做。这是HTML：<div class="tab"> <button class="tablinks" id="tab1" onclick="openSubSvc(event, 'srv1-sub1')" >Sub-Service 1</button> <button class="tablinks" id="tab2" onclick="openSubSvc(event, 'srv1-sub2')">Sub-Service 2</button> <button class="tablinks" id="tab3" onclick="openSubSvc(event, 'srv1-sub3')">Sub-Service 3</button></div><div id="srv1-sub1" class="tab-content"> <p>Text</p></div><div id="srv1-sub2" class="tab-content"> <p>Text</p></div><div id="srv1-sub3" class="tab-content"> <p>Text</p></div>这是制表符功能：function openSubSvc(evt, subSvcName) {    var i, tabcontent, tablinks;    tabcontent = document.getElementsByClassName("tab-content");    for (i = 0; i < tabcontent.length; i++) {        tabcontent[i].style.display = "none";    }    tablinks = document.getElementsByClassName("tablinks");    for (i = 0; i < tablinks.length; i++) {        tablinks[i].className = tablinks[i].className.replace(" active", "");    }    document.getElementById(subSvcName).style.display = "block";    evt.currentTarget.className += " active";}这是CSS：.tab { float: left; padding:0!important; margin:0!important;}.tab button { padding: 15px; width: 100%; text-align: left; transition: 0.3s;}.tab button:last-child {margin-bottom:0;}.tab button:hover {background-color: #ddd;}.tab button.active {background-color: #ccc;}.tab-content { width:70.8%!important; margin-left:2%!important; margin-bottom:0; padding:0!important;}因此，如果单击第一个选项卡并打开内容，则我需要在再次单击该内容时将其关闭。