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完整代码

b>App.js

import React, { Component } from 'react';
import Child from './components/Child'

class App extends Component {
  render() {
    return (
      
       
      
      
      
    );
  }
}

export default App;

Child.js

import React,{Component} from 'react'
export default class Child extends Component{
     
    render(){
        return (
            
                    我是子组件 我的名字是{this.props.name}
                    
            
        );
    }
}
Child.defaultProps = {
    name:"保密"
}
// props 默认值