Perintah pelaksanaan dicetak menggunakan react-redux - Limpahan Tindanan

Question

Kenapa pesanan bercetak 31232? Adakah saya salah tulis?

class Home extends Component {
    constructor(props) {
        super(props);
        console.log(1)
        this.props.actions.fetchTopics({type: 'excellent'})
    }
    render() {
        console.log(2)
        return (
            <p>
                xxx
            </p>
        );
    }
}

const mapStateToProps = state => {
    console.log(3)
    
    const { postsByReddit } = state
    let topics = [],
        results = postsByReddit['results']
        
    if (results)  topics = results.topics
    
    return {
        topics
    }
}

export default connect(
    mapStateToProps,
    mapDispatchToProps
)(Home);

Answer 1

31232 terbahagi kepada dua bahagian
1 312 Alat peraga komponen rendering pertama——>pembina——>render
2