layui comfirm 监听点击确定、取消、“X”关闭按钮

                    layer.confirm('数据已存在，是否继续', {
                            offset: '200px'
                            , cancel: function (index, layero) {
                                console.log('点击X按钮');
                                layer.close(index);
                            }
                        }, function (index) {
                            console.log('点击确定按钮');
                            layer.close(index);
                        }
                        , function (index) {
                            console.log('点击取消按钮');
                            layer.close(index);
                        });