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子组件调用父组件方法

父亲传一个函数props

import React, { Component } from 'react';
import Child from './components/Child'
class App extends Component {  
  showMsg(msg){
    alert(msg);
  }
  render() {  
    return (
      
        
      
    );
  }
}

export default App;

子组件在箭头函数执行props

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}
                                       
                    
            
        );
    }
}