jqGrid reads a certain attribute code for multiple lines selected

The code copy is as follows:

var selrow =articleTable.getGridParam('selarrrow');//Get the id of multiple rows

var columnCodes=[];//Initialize an array

$(selrow).each(function (index, yu) {//Transf the id and find each data and add the attribute to the initialization array

var rowData = articleTable.jqGrid("getRowData", yu);

columnCodes.push(rowData.columnCode);

});