JSON数据（采用扁平结构）对工作职位进行分类

工作职位分类扁平结构 字段：id,title,pid 例[{"id":1001,"title":"销售","pid":null},{"id":1002,"title":"客服","pid":null},{"id":1003,"title":"人事/行政/后勤","pid":null},{"id":1004,"title":"餐饮","pid":null},……