显示列表如：

                                                                                 施工总产值

|—铁路工程                                                                                                                         90000

                |-京九铁路                                                                                                              50000

                                 |----广州到南昌段                                                                       30000

                                 |----其他段                                                                                         20000

                |- 漳龙铁路                                                                                                         40000

|—公路工程                                                                                                                       50000

还有很多统计字段，我就只挑了一个字段出来做例子

我大概讲一下表结构（不是我设计的）

哎，非常失望

编辑的好好的 列表显示方式一发布居然歪成这个样子