后台技术： SpringBoot+Mybatis+MySQL+Druid
前台技术：html+Jquery+Ajax
数据库表
region_type是等级，1（直辖市及省会城市及特别行政区），2（地级市），3（区、县）
联动思路：先查出省，然后根据省的regionId当作regionParentId来查市，查出来市的regionId当作regionParentId来查县。
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省市县三级联动
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