[Rx.Observable.prototype.subscribe([observer] | [onNext], [onError], [onCompleted])
,
Rx.Observable.prototype.forEach([observer] | [onNext], [onError], [onCompleted])
](https://github.com/Reactive-Extensions/RxJS/blob/master/src/core/observable.js)
Prepends a sequence of values to an observable sequence with an optional scheduler and an argument list of values to prepend.
参数
[observer]
(Observer): The object that is to receive notifications.[onNext]
(Function
): Function to invoke for each element in the observable sequence.[onError]
(Function
): Function to invoke upon exceptional termination of the observable sequence.[onCompleted]
(Function
): Function to invoke upon graceful termination of the observable sequence.
返回值
(Disposable): The source sequence whose subscriptions and unsubscriptions happen on the specified scheduler.