long int fun1(int a, int b)
{
    long int wynik = 1;
    for (int i = 0; i < b; i++)
        wynik *= a;
    return wynik;
}

state = {    zm1: 0   };
hanleEv = () => {
    this.setState({zm1: this.state.zm1 + 1});
}
render() {
    return (<div>
        <span>{this.state.zm1}</span>
        <button onClick={this.handleEv}>BTN_1</button>
    </div>);
}

@Component({
    selector: 'sel1',
    template: `<span>{{ zm1 }}</span>
              <button (click)="onBtnCilcked()">BTN_1</button>`
})
export class Licznik1Component {
    zm1 = 0;
    onBtnCilcked() { this.zm1++; }
}