百度地图省市县三级联动，参考网络上的画区块代码，地区数据太多只能上传一部分，
chinaArea = [{"id":"801","pid":"0","shortname":"上海","name":"上海","merger_name":"中国,上海","level":"1","pinyin":"shanghai","code":"","zip_code":"","first":"S","lng":"121.472644","lat":"31.231706","index":0,"child":[{"id":"802","pid":"801","shortname":"上海","name":"上海市","merger_name":"中国,上海,上海市","level":"2","pinyin":"shanghai","code":"021","zip_code":"200000","first":"S","lng":"121.472644","lat":"31.231706","index":0,"child":[{"id":"803","pid":"802","shortname":"黄浦","name":"黄浦区","merger_name":"中国,上海,上海市,黄浦区","level":"3","pinyin":"huangpu","code":"021","zip_code":"200001","first":"H","lng":"121.49295","lat":"31.22337","index":0},{"id":"804","pid":"802","shortname":"徐汇","name":"徐汇区","merger_name":"中国,上海,上海市,徐汇区","level":"3","pinyin":"xuhui","code":"021","zip_code":"200030","first":"X","lng":"121.43676","lat":"31.18831","index":1},{"id":"805","pid":"802","shortname":"长宁","name":"长宁区","merger_name":"中国,上海,上海市,长宁区","level":"3","pinyin":"changning","code":"021","zip_code":"200050","first":"C","lng":"121.42462","lat":"31.22036","index":2},{"id":"806","pid":"802","shortname":"静安","name":"静安区","merger_name":"中国,上海,上海市,静安区","level":"3","pinyin":"jing'an","code":"021","zip_code":"200040","first":"J","lng":"121.4444","lat":"31.22884","index":3},{"id":"807","pid":"802","shortname":"普陀","name":"普陀区","merger_name":"中国,上海,上海市,普陀区","level":"3","pinyin":"putuo","code":"021","zip_code":"200333","first":"P","lng":"121.39703","lat":"31.24951","index":4}]}]}]