如何在打字稿中将对象转换为数组

Question

我正在尝试在离子项目中显示Web服务的结果，即JSON。我可以接收它并在控制台中显示，但不能在HTML视图中显示它。这是我的代码：

service.ts

 searchPerson(admin: AdminInfo): Observable<Person[]> {
    return this.http.post<Person[]>(this.personServiceApi, admin, httpOptions).pipe(
        tap((newRequest: Person[]) => {
        console.log(`fetched persons` + newRequest);}),
        catchError(this.handleError<Person[]>('fetched persons'))
    );
  }

menupage.ts：

  this.loginService.searchPerson(this.admin).subscribe((persons: Person []) => {
          if (Array.isArray(persons)) { // checks if persons is an array
              this.persons = persons;
              } else {
              console.error('persons in not an array');
              console.log('Type of persons is : ' + typeof persons);
              console.log('Persons:');
              console.log(persons);
              }
      });

menupage.html

 <ion-list>
    <ion-item *ngFor="let person of persons">
     <p>{{person.Address}}</p>
    </ion-item>

  </ion-list>

这是控制台中的结果：

fetched persons[object Object]
persons in not an array
Type of persons is : object
Persons:
{GetAllPersonResult: Array(41)}
  GetAllPersonResult: Array(41)
    0: {Address: "", Barcode: "", BirthDate: "",CertificateNo: "", Charge: , 
       …}
    1: {Address: "",Barcode: "", BirthDate: "",CertificateNo: "", Charge: , 
          …}
    2: {Address: "", Barcode: "", BirthDate: "", CertificateNo: "", Charge: 
       , …}
    3: {Address: "", Barcode: "", BirthDate: "",CertificateNo: "", Charge: , 
          …}
    4: {Address: "", Barcode: "",BirthDate: "", CertificateNo: "", Charge: , 
        …}
    …………………………………………………………………………………………………………………………………………………………….


    40: {Address: "", Barcode: "", BirthDate: "", CertificateNo: "", Charge: 
        , …}
4.  length: 41
5.  __proto__: Array(0)
2.  __proto__: Object

Answer 1

我认为罪魁祸首是O(NlogN)不是sort(...)。尝试使用此代码，并观察控制台中的错误

persons

Answer 2

您需要像这样更改ngOnInit方法：

this.loginService.searchPerson(this.admin).subscribe((persons: Person[]) => {
    this.persons = persons;

    console.log(this.persons);
});

让我知道这个答案是否有用