React父子組件間的傳值

父組件：

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

class parent extends Component{
    constructor(props) {
        super(props);
        this.state = {
            txt0:"默認值0",
            txt1:"默認值1"
        }
    }
    componentDidMount(){

    }
    parToson(){
        this.setState({
            txt0:"哈哈哈哈"
        })
    }
    sonToPar(e){
        this.setState({
            txt1:e
        })
    }
    render(){
        const style={
            paddingLeft:"150px"
        }
        return(
            <div style={style}>
                <button onClick={this.parToson.bind(this)}>傳值給子組件</button>
                <div>接受子組件的傳值爲：{this.state.txt1}</div>
                <br/>
                <Child message={this.state.txt0} getsonToPar={this.sonToPar.bind(this)}/>
            </div>
        )
    }

}

子組件：

import React, { Component } from 'react';

class child extends Component{
    constructor(props) {
        super(props);
        this.state = {
            msg:"啦啦啦啦"
        }
    }
    componentDidMount(){

    }
    render(){
        return(
            <div>
                <div>接受父組件傳的值爲：{this.props.message}</div>
                <button onClick={()=>this.props.getsonToPar(this.state.msg)}>傳值給父組件</button>
            </div>
        )
    }
}

export default child;

github：https://github.com/Rossy11/re...