角度如何插入接口的 1 个数据

Question

export interface _ProjectBudgetHistories {
  createdBy?: string ;
  id?: number;
  budgetYear? : number ;
  logicalFrameworkId? : number  ;
  projectId?: number ;
  amount?: number ;
  mooe?: number ;
  co?: number;
}
pbHistories : _ProjectBudgetHistories;
let co =500;
let mooe =1000;
this.pbHistories.co = co;
this.pbHistories.mooe = mooe;
console.log(this.pbHistories);

这是错误类型错误：无法设置未定义的属性"co" 类型错误： 无法设置未定义的属性"mooe">

===>> 如何更新 mooe 和 co 仅???

Answer 1

初始化属性

pbHistories : _ProjectBudgetHistories = {};