clipboard.js example

HTML

<script src="https://cdn.rawgit.com/zenorocha/clipboard.js/v1.5.10/dist/clipboard.min.js"></script>
<input type="button" class="buttonClass" value="Copy" data-clipboard-text="#spanId" />

JavaScript

$( document ).ready(function() {
  var clipboard = new Clipboard('.buttonClass');
});