<ul class="list-group">
<li class="list-group-item mb-2 border border-dark p-0"><a href="#" class="d-block p-2">按鈕一</a></li>
<li class="list-group-item mb-2 border border-dark p-0"><a href="#" class="d-block p-2">按鈕二</a></li>
<li class="list-group-item border border-dark p-0"><a href="#" class="d-block p-2">按鈕三</a></li>
</ul>a.active{
background:red;
}$(document).ready(function(){
$('a').click(function(e){
e.preventDefault();
$(this).toggleClass('active');
})
})