actionType

export const ADD_ITEM = 'addItem'
export const REMOVE_ITEM = 'removeItem'

actionCreator

import { ADD_ITEM, REMOVE_ITEM } from './actionTypes'

export const addUserItem = (data) => {
   return {
       type: ADD_ITEM,
       data
   }
}
export const removeUserItem = (index) => {
   return {
       type: REMOVE_ITEM,
       index
   }
}

reducer

import { ADD_ITEM, REMOVE_ITEM } from '../action/actionTypes'
const initState = [
    {
        name: '张三',
        age: 18
    },
    {
        name: '李四',
        age: 20
    },
    {
        name: '王五',
        age: 21
    },
    
]
export default (state = initState, action) => {
    switch (action.type) {
        case ADD_ITEM:
            return [
                ...initState,
                action.data

            ]
        case REMOVE_ITEM:
            const newList = JSON.parse(JSON.stringify(initState))
            newList.splice(action.index)
            return newList
        default:
            return state
    }
}

store

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

const store = createStore(allReducers)
export default store

App.jsx

import React from 'react';
import store from './store'
import {addUserItem, removeUserItem} from './store/action/actiosCreator'
class App extends React.Component {
  constructor(props) {
    super(props)
    this.state = {
      list: store.getState()
    } 
    store.subscribe(() => {
      this.setState(() => {
        return {
          list: store.getState()
        }
      })
    })
    this.handleAddItem = this.handleAddItem.bind(this)
    this.handleRemoveItem = this.handleRemoveItem.bind(this)
  }
  handleRemoveItem(index, e) {
    store.dispatch(removeUserItem(index))
  }
  handleAddItem() {
    store.dispatch(addUserItem({name: '赵六', age: 50}))
  }
  render() {
    return (
      <div>
          <ul>
            {this.state.list.map((item, index) => (
            <li style={{background: 'pink', marginTop: '10px'}} key={index} onClick={(e) => {this.handleRemoveItem(index, e)}}>
              <span>{item.name}</span> ----------- <span>{item.age}</span>
            </li>
            ))}
            <button onClick={this.handleAddItem}>添加</button>
          </ul>
      </div>
    )
  }
}
export default App;