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Redux商店没有有效的reducer,带有combineReducers和有效的reducer

import { createStore, combineReducers } from 'redux'
const reducer = (state = {}, action) => state
const rootReducer = combineReducers(reducer)
let store = createStore(rootReducer)
export default store
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创建商店时会触发警告:

Store does not have a valid reducer. Make sure the argument passed to combineReducers is an object whose values are reducers.
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当我尝试使用任何存储方法时,会再次出现此警告.

javascript reactjs redux

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