combineReducers

可以在子reducer中使用combineReducers，把子reducer中的多個reducer合併，然後再在最外層通過combineReducers處理子reducer（被combineReducers處理過的），即combineReducers可以嵌套combineReducers，combineReducers中的key值就是對應key值後的reducer函數中return的state，

>>阅读原文<<