slickgrid删除所有数据和选中的行数据

1.slickgrid  删除所有数据;把主要代码放在里面  会不会只能靠自己了

//清空子表数据
var grid = new Slick.Grid("#grid_2", dataview_2, columns_2, options2);
            //var grid = mc_grid_dic["grid_2"];
            var dataview = grid.getData();//得到数据
            var datadelete = grid.getData().getItems();//获取表格的数据
            var itemId = new Array();
            for (var i = 0; i < datadelete.length; i++) {
                itemId.push(datadelete[i].id);//组合数据ID
            }
            for (var j = 0; j < itemId.length; j++) {
                dataview.deleteItem(itemId[j]);   //删除数据      
                grid.invalidate();
                grid.render();//重新渲染
            }

2.slickgrid  删除选中的数据; 

  //子表-delete行
var grid = new Slick.Grid("#grid_2", dataview_2, columns_2, options2);
            $(".btndetail-delete").off("click").on("click", function () {
               // var gridid = $(this).data("grid");
                //var grid = mc_grid_dic[gridid];
                var selected_rows = grid.getSelectedRows();//点击选中的数据

                var dataview = grid.getData();//得到的数据
                var itemId = new Array();
                 for (var i = 0; i < selected_rows.length; i++) {
                        itemId.push(dataview.getItem(selected_rows[i]).id);
                 }

                for (var j = 0; j < itemId.length; j++) {
                    dataview.deleteItem(itemId[j]);//删除数据
                    grid.invalidate();
                    grid.render();
                }    
                grid.getSelectionModel().setSelectedRanges([]); //取消选择
            });