stream是lazy的，no subscription, no calculation occurs.

作用：Flattens multiple Observables together by blending their values into one Observable.

例子：

const clicks = fromEvent(document, 'click');const timer = interval(1000);const clicksOrTimer = merge(clicks, timer);clicksOrTimer.subscribe(x => console.log('jerry: ' + x));

測(cè)試結(jié)果：每隔1秒鐘Observable emit一個(gè)值遞增的整數(shù)。然后如果我點(diǎn)擊UI，會(huì)顯示一個(gè)[object MouseEvent]的事件：

const timer1 = interval(1000).pipe(take(10)); const timer2 = interval(1000).pipe(take(10)); const timer3 = interval(1000).pipe(take(10)); const concurrent = 3; // the argument const merged = merge(timer1, timer2, timer3, concurrent); merged.subscribe(x => console.log('diablo: '+ x));

每秒同時(shí)emit 三個(gè)值：

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