立即取消订阅RxJS Observable [英] Immediately unsubscribing from RxJS Observable

问题描述

有人可以阐明我将如何立即取消订阅RxJS的方式吗?可观察到的是来自Angular 2 EventEmitter.收到活动后，我想取消订阅.这里的问题是在功能块的内部中取消订阅.我觉得这是错误的方法:

Could anyone shed some light on how I would immediately unsubscribe from an RxJS subscription? The observable is from Angular 2 EventEmitter. When I recieve the event, I want to cancel the subscription. The issue here is cancelling the subscription within the function block. I have a feeling that this is the wrong approach:

this.subscription = observable.subscribe(result => {
    // do something
    // **unsubscribe**
});

推荐答案

observable.first().subscribe(....)

在第一个事件之后将终止订阅.

will end the subscription after the first event.

RxJs 6+的更新

observable.pipe(first()).subscribe(....)

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