how to get modal-header in js from html code example

Example 1: how to make popup modal in jquery with example

$('#sub-modal').modal({
  closeExisting: false
});

Example 2: how to make popup modal in jquery with example

<!-- Modal HTML embedded directly into document -->
<div id="ex1" class="modal">
  <p>Thanks for clicking. That felt good.</p>
  <a href="#" rel="modal:close">Close</a>
</div>

<!-- Link to open the modal -->
<p><a href="#ex1" rel="modal:open">Open Modal</a></p>