如何在redux中更新状态

// types.js

export const UPDATE_COUNTER = 'UPDATE_COUNTER';

// actions.js

import { UPDATE_COUNTER } from './types';

export const updateCounter = (value) => {
  return {
    type: UPDATE_COUNTER,
    payload: value,
  };
};

// reducer.js

import { UPDATE_COUNTER } from './types';

const initialState = {
  counter: 0,
};

const reducer = (state = initialState, action) => {
  switch (action.type) {
    case UPDATE_COUNTER:
      return {
        ...state,
        counter: action.payload,
      };
    default:
      return state;
  }
};

export default reducer;

// store.js

import { createStore } from 'redux';
import reducer from './reducer';

const store = createStore(reducer);

export default store;

// Counter.js

import React from 'react';
import { connect } from 'react-redux';
import { updateCounter } from './actions';

const Counter = ({ counter, updateCounter }) => {
  return (
    <div>
      <p>Counter: {counter}</p>
      <button onClick={() => updateCounter(counter + 1)}>Increment</button>
    </div>
  );
};

const mapStateToProps = (state) => {
  return {
    counter: state.counter,
  };
};

const mapDispatchToProps = {
  updateCounter,
};

export default connect(mapStateToProps, mapDispatchToProps)(Counter);