Typescript编译错误：<x>不能分配给<y>类型

Question

当我尝试分配

时

let blob:Blob = {blobParts: [content]};

其中content是json。

其中Blob在lib.d.ts中声明为

  interface Blob {
      readonly size: number;
      readonly type: string;
      msClose(): void;
      msDetachStream(): any;
      slice(start?: number, end?: number, contentType?: string): Blob;
  }

  declare var Blob: {
    prototype: Blob;
    new (blobParts?: any[], options?: BlobPropertyBag): Blob;
  };

它给了我以下错误：

Type '{ blobParts: any[]; }' is not assignable to type 'Blob'. Object literal may only specify known properties, and 'blobParts' does not exist in type 'Blob'.

我已多次验证blobParts的拼写

Answer 1

您应该使用new关键字...

构建Blob

let blob: Blob = new Blob([content]);