react-父组件调用子组件dom

父组件通过props把方法传递给子组件

class Parent extends React.Component {    getRef(ref){        this.node = ref    }    render(){        return(            <Children getRef = {this.getRef} />        )    }}

子组件一旦创建就会执行ref的回调

function Children (props) {    return(        <>            <input ref={props.getRef} />        </>    )    }