js NiDialog.open({
      windowClass: '',     size:'elements',     backdrop: 'static',     keyboard: false,     templateUrl: '/static/tpl/admin/dialogs/addElements.tpl',     controller: 'addElementsCtrl' }); 通过size控制,属性值为class，编译时会自动拼接类名为modal-elements，只需要将样式在css文件中设置就可以啦

.modal-elements{
      min-width: 768px; }