小程序实现带索引的城市列表

效果 1、城市数据 {"A":[{"id":"210300","name":"鞍山","fullName":"鞍山市","initialsName":"A"},{"id":"340800","name":"安庆","fullName":"安庆市","initialsName":"A"},{"id":"410500","name":"安阳","fullName":"安阳市","initialsNam

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