So basically, in jquery what we can do is to load href attribute using the load function. This way we can use the url in <a>
tag and load that in modal-body.
<a href="https://stackoverflow.com/site/login" class="ls-modal">Login</a>
//JS script
$('.ls-modal').on('click', function(e){
e.preventDefault();
$('#myModal').modal('show').find('.modal-body').load($(this).attr('href'));
});