黄聪： bootstrap 多模态框实现

默认情况下，bootstrap模态框是不支持多个覆盖的，下面是一个解决办法(本人亲测),

将下面的代码复制到当前需要多个模态框的页面，问题就可以解决

$(document).on('show.bs.modal', '.modal', function(event) {
        $(this).appendTo($('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(index) {
            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');
    }