为什么没有调用RxJS Observable构造函数中的代码？

Question

如果我在浏览器控制台中执行此操作,则构造函数似乎不会被调用 -

Observable.create(observer =>
   console.log('this is the observer'); //doesn't gets logged
   this.alertObserver = observer
);

或这个 :-

new Observable(observer =>
   console.log('this is the observer'); //doesn't gets logged
   this.alertObserver = observer
);

我试过通过导入Observer

import {Observable} from 'rxjs/Observable'; 

和

import {Observable} from 'rxjs/Rx';

但没有任何帮助.

有什么建议吗？

Answer 1

Rx observables是延迟加载的.您至少需要一个订户.

尝试:

var observable = Observable.create(observer =>
   console.log('this is the observer'); 
   this.alertObserver = observer
);
observable.subscribe();