从xml到json转换的angular2 transformRequest用法

import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from '@angular/common/http';

@Injectable()
export class DataService {
  constructor(private http: HttpClient) { }

  convertXmlToJson(xmlData: string) {
    const headers = new HttpHeaders({
      'Content-Type': 'application/xml'
    });

    const options = {
      headers: headers,
      transformRequest: [(data) => {
        // 将XML转换为JSON
        const parser = new DOMParser();
        const xmlDoc = parser.parseFromString(data, 'text/xml');
        const json = this.xmlToJson(xmlDoc);
        return JSON.stringify(json);
      }]
    };

    return this.http.post('https://example.com/api', xmlData, options);
  }

  xmlToJson(xml: Document) {
    // 实现将XML转换为JSON的逻辑
    // ...
  }
}