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RowNumber 函数返回当前行号，典型用途是实现行号自动展示和表格交替背景色。
1. 将表格第二行第一个单元格设置为 {RowNumber()}，标题为“行号”，如下图：
2. 选中表格数据整行，在属性设置的背景选项区域，选择颜色后面的
，选择“表达式”，如下图 。
3. 输入表达式“=IIF(RowNumber() mod 2=0,"Silver","White")”，该表达式的含义为：如果行号能被2整除，则背景色为银色（Silver，视觉效果为浅灰色），否则为白色。
预览报表效果，如下图：
