Javascript 计时问题：如何从angular2服务获取变量的正确值

在Angular2服务中，我在replace函数中提高变量的值

我可以从另一个组件访问该值，但我总是获得起始值

所以我总是得到->0。如果我在服务的构造函数中更改另一个值，我就可以获得它，但这不是我所需要的

这是我的服务。ts：

  export class MyService {
    colletion: Object = { foo: [], bar: [], somethig: [] }
      counter: any = 0;

      constructor() {    
          getSomeData();
      }

     getSomeData() {
      //Do stuff to get some data from server, then call:
      cleanStrings();
     }

      cleanStrings() {
        for (var i = 0; i < result.length; i++) {
          this.colletion[key][i] = key + " " + result[i].expression
          .replace(/string/g, match => {

            //HERE I RAISE THE VALUE
            this.counter++; 

            return 'FIELD-' + this.counter + '" />';
          });
        }
      }

    }

---

我必须改变什么，才能在这之后得到正确的值；已达到其最大值？

这是RxJS的作业：

更新您的服务：

export class MyService {
  counter: number = 0;
  ...
  counterSubject: BehaviorSubject<number> = new BehaviorSubject(this.counter);
  subscribeCounter = (s:any) => {
    this.counterSubject.asObservable().subscribe(s); //subscription to the next counter values
    this.counterSubject.next(this.counterSubject.getValue()); //get the current value at subscription
  }
  ...
  getSomeData() {
    //Do stuff to get some data from server, then call:
    cleanStrings();
    counterSubject.next(this.counter);
  }
  ...
}

---

不要直接吃掉服务的价值；创建一个绑定来动态更新。你有一个例子吗？请你改进一下你的答案好吗？我不明白。你的意思是要为此实现setter和getter吗？非常感谢。谢谢！工作表现：-

export class MyService {
  counter: number = 0;
  ...
  counterSubject: BehaviorSubject<number> = new BehaviorSubject(this.counter);
  subscribeCounter = (s:any) => {
    this.counterSubject.asObservable().subscribe(s); //subscription to the next counter values
    this.counterSubject.next(this.counterSubject.getValue()); //get the current value at subscription
  }
  ...
  getSomeData() {
    //Do stuff to get some data from server, then call:
    cleanStrings();
    counterSubject.next(this.counter);
  }
  ...
}

export class AppComponent implements OnInit {

  collection: Object = {};
  counter: number;

  constructor(private _myService: MyService) {
  }

  ngOnInit() {
    _myService.subscribeCounter((c) => {
      this.counter = c;
      console.log(this.counter); //incremented
    });
  }
  ...
}