sunshineawp的专栏

全国省市区编码，名称，拼音，及车牌标示的Navicat备份文件及省-市区的json文件 [{"cid":"110100","cn":"北京市","cc":"bjs","cp":"beijingshi","a":[{"aid":"110100001","an":"东城区"},{"aid":"110100002","an":"西城区"},{"aid":"110100003","an":"崇文区"},{"aid":"110100004","an":"宣武区"},{"aid":"110100005","an":"朝阳区"},{"aid":"110100006","an":"丰台区"},{"aid":"110100007","an":"石景山区"},{"aid":"110100008","an":"海淀区"},{"aid":"110100009","an":"门头沟区"},{"aid":"110100010","an":"房山区"},{"aid":"110100011","an":"通州区"},{"aid":"110100012","an":"顺义区"},{"aid":"110100013","an":"昌平区"},{"aid":"110100014","an":"大兴区"},{"aid":"110100015","an":"平谷区"},{"aid":"110100016","an":"怀柔区"},{"aid":"110100017","an":"密云县"},{"aid":"110100018","an":"延庆县"}]}]

通过传参的两个经纬度算出之间的距离，单位为米，精准度较高