This repository has been archived by the owner on Aug 13, 2018. It is now read-only.
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缓存加载机制:若未要求强制使用网络,则去加载缓存,若缓存未过期,则返回缓存,不再请求网络。若缓存过期,或无缓存,则请求网络,返回网络数据。