如何在发射之前使一个RxJS Observable序列等待另一个RxJS Observable序列完成？

本文介绍了如何在发射之前使一个RxJS Observable序列等待另一个RxJS Observable序列完成？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

说我有一个Observable，如下所示：

Say I have an Observable, like so:

var one = someObservable.take(1); one.subscribe(function(){ /* do something */ });

然后，我有第二个可观察量：

Then, I have a second observable:

var two = someOtherObservable.take(1);

现在，我想订阅两个 ，但我想在两个订阅者被解雇之前确保一个已完成。我可以在两个上使用什么样的缓冲方法让第二个等待第一个完成？

Now, I want to subscribe to two, but I want to make sure that one has completed before the two subscriber is fired. What kind of buffering method can I use on two to make the second one wait for the first one to be completed?

我想我想暂停两个，直到一个完成。

I suppose I am looking to pause two until one is complete.

推荐答案

我能想到的几种方式

//Method one var one = someObservable.take(1); var two = someOtherObservable.take(1); one.concat(two).subscribe(function() {/*do something */}); //Method two, if they need to be separate for some reason var one = someObservable.take(1); var two = someOtherObservable.take(1).publish(); two.subscribe(function(){/*do something */}); one.subscribe(function(){/*do something */}, null, two.connect.bind(two));