棱角是否真的遵循fetch的规格？ [英] Is angular really following the fetch's specifications?

问题描述

Angular的 http docs表示 http 服务返回的响应遵循获取规范。

The Angular's http docs says that the response returned by the http service follows the fetch specification.

https://angular.io/guide/http#parse-to-json

在他们的示例中，这是代码你可以找到

And in their example, this is the code you can find

private extractData(res: Response) {
  let body = res.json();
  return body.data || { };
}

其中显然是 res的结果。 json（） 不是承诺。

但是在 fetch 规范， response.json（）方法应返回 Promise 。

But in the fetch specification, the response.json() method is supposed to return a Promise.

https://fetch.spec.whatwg。 org / #response-class

我错过了 fetch 规范或Angular错误的内容关于它的实现？

Am I missing something in the fetch spec or is Angular wrong about it's implementation?

推荐答案

调查angular的http源很明显它不会返回Promise：

Looking into angular's http source it's clear it doesn't return a Promise:

 json(): any {
    if (typeof this._body === 'string') {
      return JSON.parse(<string>this._body);
    }

    if (this._body instanceof ArrayBuffer) {
      return JSON.parse(this.text());
    }

    return this._body;
  }

  // source https://github.com/angular/angular/blob/master/packages/http/src/body.ts#L26

但规格说明

[NoInterfaceObject, Exposed=(Window,Worker)]
interface Body {
  readonly attribute ReadableStream? body;
  readonly attribute boolean bodyUsed;
  [NewObject] Promise<ArrayBuffer> arrayBuffer();
  [NewObject] Promise<Blob> blob();
  [NewObject] Promise<FormData> formData();
  [NewObject] Promise<any> json();
  [NewObject] Promise<USVString> text();
};

所以似乎角度决定不严格遵守规范。

So it seems that angular decided not to follow the spec strictly.

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