我知道這可能是關(guān)于 React 被問(wèn)到最多的問(wèn)題，但沒(méi)有一個(gè)答案對(duì)我有幫助。我有兩個(gè)班級(jí)：孩子class Preview extends Component {constructor(...args) {        super(...args);        this.state = {            isCommentOpen: false        };this.handleComment = ::this.handleComment;render() {return(button type="button" onClick={this.handleComment}>Comment</button>         )}handleComment(){        this.setState({isCommentOpen: !this.state.isCommentOpen});               }        export default Preview;家長(zhǎng)class Profile extends Component { render(){        return(        <div>             <_.Preview />//the place where I want to add validation from the component above             {this.state.isCommentOpen ? <span>Cool</span> : null}       </div>}