javascript - 如何从一个公共(public)方法中提取变量的值并调用另一个方法

Question

我有一个 StepsCount 方法，我在其中获取一系列时间戳数据。我想将 timeSeries 调用到另一个组件中，我继承了此类方法，但我不确定如何从此方法中获取数据(timeSeries)。

//Main method where data sits in timeSeries 
public StepsCount(): Observable<any> {
if (this.patientIdentifierCache !== undefined) {
  this.getAllObservations(this.patientIdentifierCache, function(
    allObservations
  ) {

    timeSeries = allObservations.temperature;
    const filter = new DateFilter();
    filter.datePoint = new Date(2005, 9, 10);

    timeSeries = timeSeries.filter(filter.getDateFilter());

    return timeSeries;
  });

}
return Observable.of( timeSeries);

}

//Second method where i am trying to reach timeSeries  
const service = new MiddlewareApi();
service.StepsCount().subscribe((timeSeries => console.log (timeSeries))); 
//timeSeires variable is in ^^^^^ this method StepsCount 

//This second method should return value of timeSeries into new method.

Answer 1

您必须更深入地了解 RxJ 以及如何订阅 Observable。我看到了一些服务和缓存内容的误用，无论如何，你的服务方法 StepsCount 应该返回一个 Observable，而消费者(希望是一个组件)应该通过构造函数注入(inject)服务并执行类似的操作

service.StepsCount().subscribe(timeSeries => console.log(timeSeries));