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<button id="increment">increment</button><script src="https://cdnjs.cloudflare.com/ajax/libs/rxjs/5.4.0/Rx.js"></script>const increment = document.getElementById('increment');Rx.Observable.fromEvent(increment, 'click') .mapTo(1) .subscribe( x => console.log(`next: ${x}`), error => console.error(`error: ${error}`), () => console.log('complete') );// button をクリックする度に以下がコンソール出力される。// => "next: 1"
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