Angular5升级RxJS到5.5.3报错：EmptyError: no elements in

前言

RxJS是一种针对异步数据流编程工具，或者叫响应式扩展编程；可不管如何解释RxJS其目标就是异步编程，Angular引入RxJS为了就是让异步可控、更简单。可是最近在升级中遇到了一些问题，下面就来给大家介绍下，给同样遇到这个问题发朋友们一些参考，下面话不多说了，来一起看看详细的介绍吧。

Angular 5.0.5升级RxJS到5.5.3报错：

ERROR Error: Uncaught (in promise): EmptyError: no elements in sequence
EmptyError: no elements in sequence
 at new EmptyError (EmptyError.js:28)
 at FirstSubscriber._complete (first.js:154)
 at FirstSubscriber.Subscriber.complete (Subscriber.js:122)
 at MergeMapSubscriber._complete (mergeMap.js:150)
 at MergeMapSubscriber.Subscriber.complete (Subscriber.js:122)
 at MapSubscriber.Subscriber._complete (Subscriber.js:140)
 at MapSubscriber.Subscriber.complete (Subscriber.js:122)
 at EmptyObservable._subscribe (EmptyObservable.js:83)
 at EmptyObservable.Observable._trySubscribe (Observable.js:172)
 at EmptyObservable.Observable.subscribe (Observable.js:160)
 at new EmptyError (EmptyError.js:28)
 at FirstSubscriber._complete (first.js:154)
 at FirstSubscriber.Subscriber.complete (Subscriber.js:122)
 at MergeMapSubscriber._complete (mergeMap.js:150)
 at MergeMapSubscriber.Subscriber.complete (Subscriber.js:122)
 at MapSubscriber.Subscriber._complete (Subscriber.js:140)
 at MapSubscriber.Subscriber.complete (Subscriber.js:122)
 at EmptyObservable._subscribe (EmptyObservable.js:83)
 at EmptyObservable.Observable._trySubscribe (Observable.js:172)
 at EmptyObservable.Observable.subscribe (Observable.js:160)
 at resolvePromise (zone.js:824)

这应该是RxJS升级导致的，参考issue。

方法一

在所有的route里加上pathMath:"full"，如

const routes: Routes = [
 { path: "", component: IndexComponent },
 { path: "home", component: HomeComponent },
 { path: "about", component: AboutComponent },
 ...
];

改为

const routes: Routes = [
 { pathMatch: 'full', path: "", component: IndexComponent },
 { pathMatch: 'full', path: "home", component: HomeComponent },
 { pathMatch: 'full', path: "about", component: AboutComponent },
 ...
];

方法二

RxJS降为版本5.5.2。

注意：降版本时一定要把之前的卸载掉。

总结