rails 省市区 三级联动

routes.ebjavascript get 'areas/tree' Area表的数据css { id: 1, parent_id: nil, position: 1, name: "广东省", area_type: "District"}, { id: 2, parent_id: 1, position: 1 , name: "广州市", area_type: "City" }, {

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