MariaM0479

import React, { Component } from 'react';

class Timer extends Component {
    state = {
        seconds: 0
    };
    
    componentDidMount() {
        this.timer = setInterval(this.tick, 1000);
    }

    tick() {
        this.setState({ seconds: this.state.seconds + 1 });
    }

    componentWillUnmount() {
        clearInterval(this.timer);
    }

    render() {
        return <h5>Прошло: {this.state.seconds}</h5>
    }
}

export default Timer;