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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。
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。
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