Question

我使用Typescript（角度），但出现此错误：Cannot add property media, object is not extensible

我想在我的步骤对象中添加一个Media元素。在原始Step对象中不包含任何Media数组。

export interface Step {
  duration: string;
  instructions: string;
  ingredients_instructions?: string;
  ingredients?: Quantity[];
  media?: Media[];
  action?: CookingAction;
}

export interface Media {
  id: string;
  author: string;
  license: string;
  creation_date: string;
  modification_date: string;
  bytes: string;
}

stepsSelection: Step[] = [];
...
const media = {} as Media;
media.bytes = 'foo';
media.license = 'DR';
this.stepsSelection[i].media = [ ];
this.stepsSelection[i].media[0] = media;

Answer 1

我的问题来自@ngrx（不是typeScript）。

Answer 2

也许尝试一下：

let media = {} as Media;
media["bytes"] = 'foo';

而不是media.bytes。我相信应该可以。

Answer 3

尝试这样

this.stepsSelection[i] = {};    
this.stepsSelection[i]['media'] = [];
this.stepsSelection[i].media[0] = media;

Answer 4

如果您想即时向对象添加属性，则可以像这样修改界面

export interface Step {
  duration: string;
  instructions: string;
  ingredients_instructions?: string;
  ingredients?: Quantity[];
  action?: CookingAction;
  [prop: string]: any;
}

const step = {} as Step;
const media = {} as Media;
step.media = [ media ];
step.foo = 'bar';

角度-无法添加属性xxxx，对象不可扩展

4 个答案: