格式如下: [{"id":"110000","name":"北京市","children":[{"id":"110100","name":"北京市","children":[{"id":"110101","name":"东城区","children":[{"id":"110101001","name":"东华门街道"},{"id":"110101002","name":"景山街道"},{"id":"110101003","name":"交道口街道"},{"id":"110101004","na