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菜鸟教程 React 实例</title>
<script src="https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/react/18.2.0/umd/react.production.min.js" ></script>
<script src="https://lf3-cdn-tos.bytecdntp.com/cdn/expire-1-M/react-dom/18.2.0/umd/react-dom.production.min.js"></script>
<script src="https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/babel-standalone/6.26.0/babel.min.js" ></script>

<div id="root"></div>

<script type="text/babel">
class Content extends React.Component {
  render() {
    return  <div>
            <input type="text" value={this.props.myDataProp} onChange={this.props.updateStateProp} /> 
            <h4>{this.props.myDataProp}</h4>
            </div>;
  }
}
class HelloMessage extends React.Component {
  constructor(props) {
      super(props);
      this.state = {value: 'Hello Runoob!'};
      this.handleChange = this.handleChange.bind(this);
  }
 
  handleChange(event) {
    this.setState({value: event.target.value});
  }
  render() {
    var value = this.state.value;
    return <div>
            <Content myDataProp = {value} 
              updateStateProp = {this.handleChange}></Content>
           </div>;
  }
}
const root = ReactDOM.createRoot(document.getElementById("root"));
root.render(
  <HelloMessage />
);
</script>