Bootstrap Table 判断是否选中行，没选中给出提示

//#region 返回选中行数据

function getSelectedRowsData(selector) {
    ///<summary>返回选中行数据</summary>
    ///<param name="selector">Bootstrap Table 表对象</param>

    return $.map(selector.bootstrapTable("getSelections"),
        function(row) {
            return row; // 返回选中行数据
        });
}

//#endregion

   // 删除
    $("#btnBatchDelete").on("click",
        function() {
            var selectedRows = getSelectedRowsData($("#tableTop"));

            if (selectedRows.length === 0) {
                toastr.warning("请选择要删除的数据!");
                return;
            } else {
                toastr.warning(selectedRows.length);

                var idArray = [];
                for (var i = 0; i < selectedRows.length; i++) {
                    idArray.push(selectedRows[i].BookId);
                }

                // 弹窗 确认
                swal({
                        title: "温馨提示",
                        text: "您确认要删除图书ID：" + idArray + "吗？",
                        icon: "warning",
                        buttons: true,
                        dangerMode: true,
                    })
                    .then((willDelete) => {
                        if (willDelete) {

                            // 删除操作逻辑实现
                            toastr.success("删除操作执行中！");

                            window.swal("删除成功！", { icon: "success" });

                            // 刷新数据
                            window.swal("刷新数据成功！", { icon: "success" });

                        } else {
                            
                        }
                    });
            }
        });