[TypeScript 报错] Cannot set property ‘XXXXXXXX‘ of undefined

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这个问题是给ts 对象赋值的时候出现的

先说明结果：需要给声明对象初始化

错误由来->
对象

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export interface OrderInterface{
  orderId?: string;
  userId?: string;
  userName?:string;
  carModelName?: string;
  orderTime?: string;
  orderState?: string;
  model?: string;
  outwardWheel?: string;
  outwardColor?:string;
  interior?: string;
  features?: string;
  carImg?:string;
  carPrice?:string;
}

某.ts文件

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...省略...
  order:OrderInterface；
...省略....
  this.order.carPrice = this.inputCarPrice;
  this.order.carImg = this.Photo;
...省略....

报错

Cannot set property ‘display’ of undefined

这个时候问题出在 ts 中没有无参构造所以需要在声明这个"对象"的时候进行初始化

某.ts文件

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...省略...
   order:OrderInterface={
    orderId:"",
    userId: "",
    userName: "",
    carModelName: "",
    orderTime: "",
    orderState: "",
    model: "",
    outwardWheel: "",
    outwardColor: "",
    interior: "",
    features: "",
    carImg: "",
    carPrice: "",
  };
...省略....
  this.order.carPrice = this.inputCarPrice;
  this.order.carImg = this.Photo;
...省略....