. 为什么会出现以下错误？ 类型“照片”不可分配给类型“从不”

Question

enter image description here

export class PhotoListComponent implements OnInit {

  photos = [];

  constructor(private photoService: PhotoService) { }

  ngOnInit() {
    this.photoService.getPhotos()
    .subscribe(
      res => {
        this.photos = res;
      },
      err => console.log(err)
    )
  }

}

Answer 1

photos = [];

Since you havn't specified a type here, typescript needs to infer it. But with no clues about what this array is supposed to contain, typescript infers the type to be never[] . Then later on, when you try to assign something else to it, you get a type error.

Change it to:

photos: Photo[] = [];