How to get a cell value from w2ui grid?

var changeArr=w2ui['grid'].getChanges();

$(changeArr).each(function() {

 test = $(w2ui['grid'].get(this.recid)).attr("ColumnName");

//OR

test = w2ui['grid'].getCellValue(w2ui['grid'].get($(this).attr("recid"),true), column_index) ;

});