Java script execute on a button
trying to add this to a button but does not want to execute
<a class="rj-order-online" data-rj-company-id="4244">Online Order Now!</a> <script src="https://cdn.restajet.com/webapp/webapp_popup.min.js" defer async></script>
tried adding <script>
dmAPI.loadScript to the code but nothing.
Can anyone help?