返回值，而不是将结果放入变量中。 角度2

Question

This code below going to load json file asynchronously and insert the result inside the _values variable.

private getValue(name) {
this.http.get('http://localhost:8080/getValue/' + name)
  .subscribe(res => this._values = res.json());
}

What I want is just to return one value, like normal JS function. I don't want the result to be stored inside variable. I just want the function to return a value.

Thank you in advance.

Answer 1

Try this.

 private getValue(name) : any {
    return this.http.get('http://localhost:8080/getValue/' + name)
                    .map(res => res.json());
 }

OR :

 import 'rxjs/add/operator/toPromise';

 private getValue(name) : Promise<any>{
        return this.http.get('http://localhost:8080/getValue/' + name)
                        .toPromise()
                        .then(response => response.json());
 } 

then you would call this method with

Promise<any> myvar = getValue(name);