new Observable 和 of 或 from 有什么区别? [英] What is the Difference between new Observable and of or from?

问题描述

新的 Observable 和从 of 或 from 创建的 observable 有什么区别?

What is the Difference between new Observable and observable created from of or from?

of([1, 2, 3]).subscribe(x => console.log(x));

from([1, 2, 3]).subscribe(x => console.log(x));

vs new Observable()

以上两种创建 observables 的主要区别是什么?

What is the main difference between the above two way of creating observables?

我已经阅读了这篇文章，但还不够令人信服！new Observable()"和of()"在 RxJ 中

I have read this, but it's not yet convincing! what is the difference between "new Observable()" and "of()" in RxJs

我不是在问 of 和 from 之间的区别.我在问(of 或 from)与 new Observable() 的区别

推荐答案

本质上，可观察的创建函数 of、from 和其他只是创建一个 newObservable() 具有特定行为.

Essentially, the observable creation functions of, from, and others simply create a new Observable() with specific behavior.

因此，new Observable() 和创建者函数之间的唯一区别是实际行为.

So, the only difference between new Observable() and the creator fuctions is the actual behavior.

例如，of() 函数如下所示(简化):

For example, here is what the of() function looks like (simplified):

export function of<T>(...array: Array<T>): Observable<T> {
  return new Observable<T>(subscriber => {
    for (let i = 0; i < array.length && !subscriber.closed; i++) {
      subscriber.next(array[i]);
    }
    subscriber.complete();
  });
}

您可以看到 new Observable() 在 of() 函数中被调用.

You can see that new Observable() is called within the of() function.

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