{% if book.isPdf %}
{% else %}
{% endif %}
Returns an observable sequence that produces a value after each period.
period
(Number
): Period for producing the values in the resulting sequence (specified as an integer denoting milliseconds).[scheduler]
(Scheduler=Rx.Scheduler.timeout): Scheduler to run the timer on. If not specified, Rx.Scheduler.timeout is used.
(Observable
): An observable sequence that produces a value after each period.