SO - 23266545

by webwakko

HTML

<link rel="stylesheet" href="//cdnjs.cloudflare.com/ajax/libs/font-awesome/4.0.3/css/font-awesome.css">
<script src="https://kit.fontawesome.com/9215b22b87.js"></script>
<span class="mute"><i class="fas fa-volume-up"></i></span>

JavaScript

$('.mute').click(function() {
      	$(this).find('i').toggleClass('fa-volume-up fa-volume-mute');
      });