layui 子页面传值到父页面

layer.open({
            type: 2,
            title: '修改',
            skin: 'layui-layer-molv',
            area: ['60%', '90%'],
            content: 'url',
            success:function (layero,index) {
                             var iframe = window['layui-layer-iframe' + index];
                             iframe.child('我是父布局传到子布局的值');
                          }

           });