全国所有的城市（按城市首字母）+市区json数据[ { "tag":"*热门城市", "cities":[ {"id":"110100","name":"北京市"}, {"id":"310100","name":"上海市"}, {"id":"440100","name":"广州市"}, {"id":"440300","name":"深圳市"}, {"id":"420100","name":"武汉市"} ] }, { "tag":"A", "cities":[ { "id":"210300","name":"鞍山市",