react 父组件给子组件传值

父组件

import React from 'react'
import '../page1/header.css'
import { Table } from 'antd'
import Child from './child'//引入的子组件

export default class Header extends React.Component{
constructor(){
super()

this.state = {

　　mess:"我是父组件",

}

}

return (
<div>

<Child  msg = {this.state.mess} /> 

</div>
)

子组件

import React from 'react'

export default class Header extends React.Component{
constructor(props){
super(props)

}

render(){
console.log(this.props.msg)//通过 this.props.msg接受
return (
<div className="header">
　　<h5>子组件:{this.props.msg}</h5>
</div>
)
}
}