SMART datagrid v.1 > Classes > CalculatedColumn
当valueType为NUMBER并且计算值为NaN时,将会被替代的数值。
默认值为undefined.
    grid.setColumns([{
        name: "colAmount",
        type: "calced",
        valueExpression: "unit_price * quantity",
        nanValue: 0
    },
        ...
    ]);