bootstrap多模態框

$(document).on('show.bs.modal', '.modal', function(event) {
    if(!$(this).hasClass("in")){
        $(this).appendTo($('body'));
    }
}).on('shown.bs.modal', '.modal.in', function(event) {
    setModalsAndBackdropsOrder();
}).on('hidden.bs.modal', '.modal', function(event) {
    setModalsAndBackdropsOrder();
});

function setModalsAndBackdropsOrder() {
    var modalZIndex = 1040;
    $('.modal.in').each(function() {
        var $modal = $(this);
        modalZIndex++;
        $modal.css('zIndex', modalZIndex);
        $modal.next('.modal-backdrop.in').addClass('hidden').css('zIndex', modalZIndex - 1);
    });
    $('.modal.in:visible:last').focus().next('.modal-backdrop.in').removeClass('hidden');
}