Rx.Observable.prototype.throttle(dueTime, [scheduler])

Ignores values from an observable sequence which are followed by another value before dueTime.
参数
dueTime(Number): Duration of the throttle period for each value (specified as an integer denoting milliseconds).[scheduler=Rx.Scheduler.timeout](Any): Scheduler to run the throttle timers on. If not specified, the timeout scheduler is used.
返回值
(Observable): The throttled sequence.