通过服务从json文件获取数据“输入意外结束” 角度4

英雄服务.ts

getPeopleData(): Observable<people[]>{
  return this.http.get<people[]>('assets/data/someData.json');
}

people.interface.ts

export interface people{
    id: number,
    name: string,
    age: number
}

[
    {"id":1, "name": "Jack", "age": 21},
    {"id":2, "name": "Rina", "age": 29},
    {"id":3, "name": "Jonathan", "age": 42}
]

关于.component.ts

  peopleData:any;

  ngOnInit() {
    this.getPeople();
  }

  getPeople(): void {
   this.heroesService.getPeopleData()
    .subscribe(data => this.peopleData = data)
  }

有人能帮帮我吗,哪里出了问题?控制台中没有错误。