1、父==》子組件傳值
父組件
import Son from './Son'
<div>
<Son val = { this.state.name }/>
</div>
子組件
<div>
這是父傳給子的值：{this.props.val}
</div>
2.子==》父組件傳值
子組件
clickHandle = ()=> {
this.props.clickHandle('我是兒子的數(shù)據(jù)')
}
<button onClick = { this.clickHandle }>修改</button>
父組件
clickHandle = (data)=> {
this.setState({ name: data })
}
<Son clickHandle = { this.clickHandle } />
