datagrid结束编辑后combobox不显示value值

1.行编辑事件结束时赋值Text值

            pfGridEndEdit:function (index, row, changes) {
                var editor_item = $('#payfee_grid').datagrid('getEditor', {index: index, field: 'bill_type'});
                row.bill_type = $(editor_item.target).combobox('getText');
            },