Angular 2事件发射器与主题 [英] Angular 2 Event emitters vs Subject

问题描述

在Angular 2中，事件发射器和主题之间宣布事件的区别是什么?似乎事件发射器的声明并不那么复杂....Angular 2首选哪种方式?

In Angular 2 what is the difference between Event Emitter and Subject for announcing an event? It seems like event emitters are less complicated to declare....Which way is preferred by Angular 2?

dataRefreshEvent = new EventEmitter();

private companyDataAnnouncedSource = new Subject();
companyDataAnnouncedSource$ = this.companyDataAnnouncedSource.asObservable();

推荐答案

没有太大区别. EventEmitter扩展Subject.

There is not much difference. EventEmitter extends Subject.

但是Angular2团队强调了一个事实，除了组件和指令中的@Output()之外，EventEmitter不得用于其他任何用途.

The Angular2 team stressed the fact though, that EventEmitter should not be used for anything else then @Output()s in components and directives.

Angular团队已声明，他们可能会更改EventEmitter的基础实现，并破坏使用EventEmitter的用户代码，这些代码本来是不希望的.那是主要的区别.

The Angular team has stated that they may change the underlying implementation of EventEmitter and break user code that uses EventEmitter for something it wasn't intended for. That's the main difference.

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