ionic本机http post调用不支持将responseType作为从as WebService下载的pdf的blob

import { HttpClient } from '@angular/common/http';

constructor(private http: HttpClient) { }

const url = 'your_web_service_url';
const options = {
  responseType: 'blob' as 'json' // 设置responseType为"blob"
};

this.http.post(url, postData, options)
  .subscribe((response: Blob) => {
    // 处理Blob响应，例如保存为PDF文件
    const blob = new Blob([response], { type: 'application/pdf' });
    const url = window.URL.createObjectURL(blob);
    window.open(url); // 在新窗口中打开PDF文件
  }, (error) => {
    console.error(error);
  });