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借鉴 mobx 的思想,比较好的重新实现了 FileTree 的模型,用了大量 getter 每次从源数据重新计算需要的值,这样仍旧符合函数式思路,没有维护过程状态的负担,但能使得 API 层面保留 OO 式的操作便利。