Ext 表格得到所有行，并得到相应的列值

//取出被所有列值function getGridValue(gridname){ var grid = Ext.getCmp(gridname); var grid_data = grid.getStore(); //var data_ids = ""; var data_values = ""; for(var i= 0 ;i< grid_data.data.length;i++){var row = grid_data.getAt(i);var id = row.get("class_unid");var year = row.get("score");if(year == "") year = "null";data_values += ";"+id+","+year;} data_values = data_values.substring(1); return data_values; }