how to close modal in javascript code example

Example 1: data-dismiss= modal in jquery

$(document).ready(function(){
        // Open modal on page load
        $("#myModal").modal('show');
 
        // Close modal on button click
        $(".btn").click(function(){
            $("#myModal").modal('hide');
        });
    });

Example 2: javascript modal close

$('#closemodal').click(function() {
    $('#modalwindow').modal('hide');
});