我是Observables的新手.我如何从一个简单的字符串创建Observable？然后订阅它并在它改变时输出它.
那有意义吗？
My constructor on service
constructor() {
// Create observable stream to output our data
this.notice = Observable.create(
(observer) => this.observer = observer;
);
};
My method on service
set(string) {
this.notice.subscribe((value) => {
// Push the new value into the observable stream
this.observer.next(string);
},(error) => console.log('Could not set data.'));
}
Calling service method
setNotice(event) {
event.preventDefault();
// Calling service to set notice
this.noticeService.set('This is a string');
}
我想我在这里做错了什么？但不知道该怎么问.我将不胜感激任何解释.
