RxJs Observables嵌套订阅吗? [英] RxJs Observables nested subscriptions?

问题描述

简化以下代码示例的方法是什么? 我找不到合适的运算符..有人可以举一个简短的例子吗?

Whats the way to simplify something like the following code example? I can't find the right operator.. could anyone give a short example?

this.returnsObservable1(...)
  .subscribe(

    success => {

      this.returnsObservable2(...)
        .subscribe(

          success => {

            this.returnsObservable3(...)
              .subscribe(

                success => {
                   ...
                },

推荐答案

如注释中所述，您正在寻找flatMap运算符.

As mentioned in comments, you are looking for the flatMap operator.

您可以在以前的答案中找到更多详细信息:

You can find more details in previous answers :

• 如何在rxjs中执行链序列
• 为什么需要使用flatMap?

• How to do the chain sequence in rxjs
• Why do we need to use flatMap?

您的示例为:

this.returnsObservable1(...)
  .flatMap(success => this.returnsObservable2(...))
  .flatMap(success => this.returnsObservable3(...))
  .subscribe(success => {(...)}); 

这篇关于RxJs Observables嵌套订阅吗?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！