比如$fine_position的数值是 {"departments":"XXX有限公司,北京供水所,朝阳营业厅","jobTitle":"台账系统"}, {"departments":"XXX有限公司,上海供水所,静安营业厅","jobTitle":"工会查看系统"}, {"departments":"XXX有限公司,珠海供水所,香洲营业厅","jobTitle":"工会查看系统"}我想取出 jobTitle值为:”工会查看系统“的departments的最后一个值,也就是”静安营业厅”和“香洲营业厅“,求大佬解惑