Rx.Observable.prototype.concatMapObserver(onNext, onError, onCompleted, [thisArg])
, Rx.Observable.prototype.selectConcatObserver(onNext, onError, onCompleted, [thisArg])
Projects each notification of an observable sequence to an observable sequence and concats the resulting observable sequences into one observable sequence.
参数
onNext
(Function
): A transform function to apply to each element. The selector is called with the following information:- the value of the element
- the index of the element
onError
(Function
): A transform function to apply when an error occurs in the source sequence.onCompleted
(Function
): A transform function to apply when the end of the source sequence is reached.[thisArg]
(Any
): Object to use asthis
when executing the transform functions.
返回值
(Observable
): An observable sequence whose elements are the result of invoking the one-to-many transform function corresponding to each notification in the input sequence.