Question

getMemberInformation() {

  let url = "http://abc/abc/xyz";
  return this._http.get(url, xhrRequestOptions()).map(
     data => {
               return JSON.stringify(data);
          })
 }}

myRequestResponse：any;

ngOnInit() {
  this._AnotherClass.getMemberInformation().subscribe(data => console.log('Data Level 0:',data));
  this._AnotherClass.getMemberInformation().subscribe(data => this.myRequestResponse = data);
  console.log('Data Level 1:', this.myRequestResponse);

=========编辑后，代码数据将出现在数据级0日志中，但数据栏1不显示数据。

Answer 1

这是设计的。数据仅在函数传递给subscribe(...)

时可用

data => this.getMyCarsFromServer = JSON.stringify(data)

被召唤。

只需将代码更改为

即可

.subscribe(
              data => {
                this.getMyCarsFromServer = JSON.stringify(data); // put the data returned from the server in our variable
                console.log('hello data', this.getMyCarsFromServer);
              },
              error => console.log("Error HTTP GET Service"), // in case of failure show this message
              () => console.log("Job Done Get !", this.getMyCarsFromServer)//run this code in all cases
         );

您可以将.subscribe()更改为.map()，然后返回Observable而不是Subscription，并且来电者可以订阅。

someMethod() {
    return this.someService.someObservable.map(
              data => {
                //this.getMyCarsFromServer = JSON.stringify(data); // put the data returned from the server in our variable
                // console.log('hello data', this.getMyCarsFromServer);
                return JSON.stringify(data);
              })
              .catch(error => {
                console.log("Error HTTP GET Service"); // in case of failure show this message
                throw error;
                // or 
                return Observable.throw();
                // or
                return Observable.of([]);
              })
              .finally(() => console.log("Job Done Get !", this.getMyCarsFromServer);//run this code in all cases
}

this.someMethod().subscribe(data => console.log(data));

hello数据日志中的subscribe方法之外无法访问的数据

1 个答案: