管理员登录后可对人员按条件查询，并统计人口，可以看到人口的男女比例，并可看到各个年龄段人口的分布，普通用户可注册后登录查看和修改信息。-After the administrator login for staff query by the conditions, and population statistics, we can see the proportion of male and female population of all ages can see the distributi