多播 是在一次执行中向多个订户列表广播的一种做法。让’演示了多播功能,
var source = Rx.Observable.from([1, 2, 3]);
var subject = new Rx.Subject();
var multicasted = source.multicast(subject);
// These are, under the hood, `subject.subscribe({...})`:
multicasted.subscribe({ next: (v) => console.log('observerA: ' + v) });
multicasted.subscribe({ next: (v) => console.log('observerB: ' + v) });
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