定时器

class Blink extends Component {
    // 构造
    constructor(props) {
        super(props);
        // 初始状态
        this.state = {showText: true};

        setInterval(()=> {
            this.setState(previousState=> {
                return {showText: !previousState.showText};
            });
        }, 100);
    }

    render() {

        let display = this.state.showText ? this.props.text : '';

        return (<Text> {display}</Text>);
    };
}


export default class App extends Component<{}> {
    render() {
        return (
            <View>
                <Blink text='I love to blink'/>
                <Blink text='Yes blinking is so great'/>
                <Blink text='Why did they ever take this out of HTML'/>
                <Blink text='Look at me look at me look at me'/>
            </View>
        );
    }
}