使用React Redux实现React组件之间的数据共享

npm install react-redux redux redux-thunk --save

// reducers/count.js
import { COUNT_ADD } from '../constant';

const initState = 0;

export default function CountReducer(preState = initState, action) {
  const { type, data } = action;
  switch (type) {
    case COUNT_ADD:
      const { value1, value2 } = data;
      return value1 + value2;
    default:
      return preState;
  }
}

// reducers/person.js
import { PERSON_ADD } from '../constant';

const initState = [];

export default function PersonReducer(preState = initState, action) {
  const { type, data } = action;
  switch (type) {
    case PERSON_ADD:
      return [data, ...preState];
    default:
      return preState;
  }
}

// store.js
import { createStore, applyMiddleware, combineReducers } from 'redux';
import thunk from 'redux-thunk';

import countReducer from './reducers/count';
import personReducer from './reducers/person';

// 组合所有的Reducer
const rootReducer = combineReducers({
  count: countReducer,
  persons: personReducer,
});

// 创建Redux Store，并应用中间件
const store = createStore(rootReducer, applyMiddleware(thunk));

export default store;

// containers/Count/index.jsx
import { connect } from 'react-redux';
import React, { Component } from 'react';
import { InputNumber, Button } from 'antd';

import { createAsyncAddAction } from '../../actions/count';

class CountUI extends Component {
  state = {
    value1: 0,
    value2: 0,
  }

  add = () => {
    const { value1, value2 } = this.state;
    this.props.add({ value1, value2 });
  }

  render() {
    const { value1, value2 } = this.state;
    const { total, persons } = this.props;

    return (
      <div>
        <h2>我是Count组件，Person组件的录入人数是：{persons.length}</h2>
        <InputNumber value={value1} onChange={ val => this.setState({ value1: val }) } /> +
        <InputNumber value={value2} onChange={ val => this.setState({ value2: val }) } />
        <Button type="link" onClick={this.add}>=</Button>
        {total}
      </div>
    )
  }
}

export default connect(
  state => ({ total: state.count, persons: state.persons }),
  {
    add: createAsyncAddAction,
  }
)(CountUI);

// containers/Person/index.jsx
import React, { Component } from 'react';
import { Input, Button, Table } from 'antd';
import { nanoid } from 'nanoid';
import { connect } from 'react-redux';

import { createAddAction } from '../../actions/person';

const columns = [
  {
    title: '姓名',
    dataIndex: 'name',
    key: 'name',
  },
  {
    title: '年龄',
    dataIndex: 'age',
    key: 'age',
  },
];

class Person extends Component {
  state = {
    name: '',
    age: '',
  }

  add = () => {
    const { name, age } = this.state;
    const person = { key: nanoid(), name, age };
    this.props.add(person);
    this.setState({ name: '', age: '' });
  }

  render() {
    const { persons, total } = this.props;
    const { name, age } = this.state;

    return (
      <div>
        <h2>我是Person组件，Count组件的求和结果是{total}</h2>
        <Input
          placeholder="姓名"
          value={name}
          onChange={e => this.setState({ name: e.target.value })}
        />
        <Input
          placeholder="年龄"
          value={age}
          onChange={e => this.setState({ age: e.target.value })}
        />
        <Button onClick={this.add} type="primary">添加</Button>
        <Table dataSource={persons} columns={columns} />
      </div>
    )
  }
}

export default connect(
  state => ({ persons: state.persons, total: state.count }),
  {
    add: createAddAction,
  }
)(Person);

// App.jsx
import React, { Component } from 'react';
import { Provider } from 'react-redux';

import store from './store';
import Count from './containers/Count';
import Person from './containers/Person';

export default class App extends Component {
  render() {
    return (
      <Provider store={store}>
        <Count />
        <hr />
        <Person />
      </Provider>
    )
  }
}