将数据从一个组件发送到另一个组件

// ParentComponent.js
import React from 'react';
import ChildComponent from './ChildComponent';

class ParentComponent extends React.Component {
  state = {
    message: 'Hello from Parent'
  };

  render() {
    return (
      <div>
        <ChildComponent message={this.state.message} />
      </div>
    );
  }
}

export default ParentComponent;

// ChildComponent.js
import React from 'react';

class ChildComponent extends React.Component {
  render() {
    return <div>{this.props.message}</div>;
  }
}

export default ChildComponent;

// ServiceA.js
const axios = require('axios');

async function callServiceB() {
  try {
    const response = await axios.get('http://localhost:3001/data');
    console.log(response.data);
  } catch (error) {
    console.error('Error calling ServiceB:', error);
  }
}

callServiceB();

// ServiceB.js
const express = require('express');
const app = express();
const port = 3001;

app.get('/data', (req, res) => {
  res.json({ message: 'Hello from ServiceB' });
});

app.listen(port, () => {
  console.log(`ServiceB listening at http://localhost:${port}`);
});