How to consume Observable objects in rxjs

Test code:

import { of } from 'rxjs';
import { Injectable } from '@angular/core';

@Injectable()
export class JerrySandBoxService{
    name = 'Jerry';
    print(){
        const myObservable = of(1, 2, 3);

        // 创建一个观察者对象-Observer(处理next、error、complete回调)
        const myObserver = {
         next: x => console.log('Observer got a next value: ' + x),
        error: err => console.error('Observer got an error: ' + err),
        complete: () => console.log('Observer got a complete notification'),
    };

        // 通过Observable的subscribe函数，观察者去订阅可观察者的消息
        myObservable.subscribe(myObserver);
    }
}

The Observable constructor is called, and the incoming array is wrapped by subscribeToArray:

Observable's constructor, the accepted parameter is another function:

Finally, of returns an observable object.

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