Html Custom Atribute | JavaScript | data- | jQuery

1. Use data-{your custom attribute name}
1. <a data-url="<?php echo admin_url('admin-ajax.php'); ?>">
2. Get data- value
1. var url =$(this).data('url');
3. Edit data- attribute value
1. newUrl = 'https://excellentprogrammingtricks.blogspot.com/';
2. $(this).data('url', newUrl );
3. Inspect option shows old value because it's not dynamically updated. 
4. So, finally can use multiple data- attribute with different name in tag.