解决方案是在关闭引导模态窗口后将其完全破坏，而在再次打开该窗口时不还原所有内容.

The solution is to destroy the bootstrap modal window completely after closing it , to not restore everything when open it again .

$('#modal').on('hidden', function(){
$(this).data('modal', null);

});

如果是引导程序3，则可以使用:

if is bootstrap 3 you can use:

$("#modal").on('hidden.bs.modal', function () {
    $(this).data('bs.modal', null);
});