fix #2439: Fix filterBy cannot filter array keys
fix #2439: Fix filterBy cannot filter array keys

y1170328179s/Bootstrap-table,wenzhixin/bootstrap-table,horken-w/bootstrap-table,djhvscf/bootstrap-table,CIFullCalendar/bootstrap-table,djhvscf/bootstrap-table,Flounn/bootstrap-table,wenzhixin/bootstrap-table,djhvscf/bootstrap-table,wenzhixin/bootstrap-table,CIFullCalendar/bootstrap-table,djhvscf/bootstrap-table