让你的bootstrap3模态框也能有滚动条效果

 <style>
        .modal-dialog {
            position: absolute;

            top: 0;

            bottom: 0;

            left: 0;

            right: 0;

        }

        .modal-content {
            /*overflow-y: scroll; */

            position: absolute;

            top: 0;

            bottom: 0;

            width: 100%;

        }

        .modal-body {
            overflow-y: auto;
            position: absolute;
            top: 55px;
            bottom: 65px;
            width: 100%;
        }

        .modal-header .close {margin-right: 15px;}

        .modal-footer {
            position: absolute;
            width: 100%;
            bottom: 0;

        }
    </style>