rxjs - 可观察的 : Complete vs finally vs done

Question

在谈到 Observables(尤其是 rxjs)时，“finally”和“done”或“complete”有什么区别？

Answer 1

finally 总是在可观察序列终止时发生(包括错误)；完成仅在它无错误终止时发生。

最后:

Invokes a specified action after the source observable sequence terminates gracefully or exceptionally.

https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/core/operators/finally.md

已完成:

An Observable calls this method after it has called onNext for the final time, if it has not encountered any errors.

http://reactivex.io/documentation/observable.html

“完成”不是 rx/observables 的概念。我刚刚看到它打印在“Complete”/“OnComplete”的示例中。

注意:当您调用 subscribe时，语法通常是:

observable.subscribe([observer] | [onNext], [onError], [onCompleted]);
// Like this:
observable.subscribe(
    (value) => { ... },
    (error) => { ... },
    () => { console.log('complete!'); }
);

或者

observable.subscribe({
  next: x => console.log('got value ' + x),
  error: err => console.error('something wrong occurred: ' + err),
  complete: () => console.log('done'),
});

鉴于 finally处理方式如下:

observable.finally(() => { console.log('finally!'); })
          .subscribe(...) // you can still call subscribe