打字稿如何将类分配给JSON对象数组

Question

假设我有JSON对象的数组，如何将类或分配给它？

console.log('jsonBody ' + jsonBody);
//print jsonBody [object Object],[object Object]

console.log('jsonBody ' + JSON.stringify(jsonBody));
//print jsonBody [{"created_at":"2016-02-04","updated_at":"2016-02-04 00:45:56.000"}, {"created_at":"2016-02-04","updated_at":"2016-02-04 00:45:56.000"}]

//typescript class
export class Report {
  created_at!: Date;
  updated_at!: Date;
}

Answer 1

创建一个接受JSON类型对象的构造函数：

class Report {
  created_at!: Date;
  updated_at!: Date;
  
  constructor({created_at, updated_at}: {created_at: string, updated_at: string}) {
      this.created_at = new Date(created_at);
      this.updated_at = new Date(updated_at);
  }
}

let jsonBody = [{"created_at":"2016-02-04","updated_at":"2016-02-04 00:45:56.000"}, {"created_at":"2016-02-04","updated_at":"2016-02-04 00:45:56.000"}];

let arr: Report[] = jsonBody.map(obj => new Report(obj));