我正在使用AsyncStorage尝试在我的React应用中持久化我的redux状态，但是我遇到了这个错误：TypeError: undefined is not a function (near '...state.reduce...')。 我查看了其他类似错误的答案，但没有成功。我甚至不确定哪个是undefined，因为它只是说“near”。我已经检查了state对象，它不是空的。 这是我的主要代码： 应用程序.js：

import Main from "./src/components/Main"
import { NativeRouter } from "react-router-native"
import { createStore } from "redux"
import { Provider } from "react-redux"
import reducer from "./src/reducer"
import AsyncStorage from "@react-native-async-storage/async-storage"
import { persistStore, persistReducer } from "redux-persist"
import { PersistGate } from "redux-persist/integration/react"
import Text from "./src/components/Text"

const persistConfig = {
  key: "root",
  storage: AsyncStorage,
}

const persistedReducer = persistReducer(persistConfig, reducer)

const store = createStore(persistedReducer)
const persistor = persistStore(store)

export default function App() {
  return (
    <NativeRouter>
      <Provider store={store}>
        <PersistGate loading={<Text>Loading...</Text>} persistor={persistor}>
          <Main />
        </PersistGate>
      </Provider>
    </NativeRouter>
  )
}

这是reducer的代码： 减速器.js：

const reducer = (state = [], action) => {
  switch (action.type) {
    case "NEW_NOTE": {
      console.log("state :>> ", state)
      const max = state.reduce(
        (prev, current) => {
          // if (!current) return prev
          return current.id > prev.id ? current : prev
        },
        { id: 0, body: "" }
      )
      const newNote = { id: max.id + 1, body: "" }
      return state.concat(newNote)
    }
    case "UPDATE_NOTE": {
      const newNotes = state.filter((note) => action.data.id !== note.id)
      return [action.data, ...newNotes]
    }
    case "DELETE_NOTE": {
      return state.filter((note) => action.id !== note.id)
    }
    default: {
      return state
    }
  }
}

export default reducer

编辑

持久化的reducer将数组更改为对象。我想我需要改变我的代码以适应这个。有任何关于为什么会发生这种情况的想法吗？

使用普通reducer的state对象：

[{"body": "Ddtstostksoyoyyxcuj", "id": 2}, {"body": "Ftistldpufipf 
Hhxgjbv", "id": 1}]

使用持久化reducer的state对象：

{"0": {"body": "my first note", "id": 1}, "1": {"body": "my second note", "id": 2}, "2": {"body": "my third note", "id": 3}}

修复

减速器.js

const reducer = (state = [], action) => {
  state = Object.values(state)
  ...

选择器：

const notes = useSelector((state) => Object.values(state).slice(0, -1))

我必须删除第-1个元素，因为persistor包含一个额外的属性： {"0": {"body": "嗨", "id": 7}, "1": {"body": "", "id": 8}, "2": {"body" ：“”，“id”：9}，“_persist”：{“重新水合”：true，“版本”：-1}}