在react中设置数据

import React, { Component } from 'react';

class MyComponent extends Component {
  constructor(props) {
    super(props);
    this.state = {
      data: 'Initial data'
    };
  }

  updateData = () => {
    this.setState({ data: 'Updated data' });
  }

  render() {
    return (
      <div>
        <h1>{this.state.data}</h1>
        <button onClick={this.updateData}>Update Data</button>
      </div>
    );
  }
}

export default MyComponent;

import React from 'react';

const MyComponent = (props) => {
  return (
    <div>
      <h1>{props.data}</h1>
    </div>
  );
}

export default MyComponent;

import React from 'react';
import MyComponent from './MyComponent';

const App = () => {
  return (
    <div>
      <MyComponent data="Hello React" />
    </div>
  );
}

export default App;

import React, { createContext, useContext } from 'react';

const MyContext = createContext();

const ParentComponent = () => {
  return (
    <MyContext.Provider value="Shared data">
      <ChildComponent />
    </MyContext.Provider>
  );
}

const ChildComponent = () => {
  const data = useContext(MyContext);
  return (
    <div>
      <h1>{data}</h1>
    </div>
  );
}

export default ParentComponent;