如何在nativescript中使用分块表单数据上传文件？

import { Http, Headers } from "@angular/http";
import { knownFolders, File } from "tns-core-modules/file-system";

uploadFile(filePath: string) {
  // 创建HTTP请求对象
  let http = new Http();

  // 创建请求头
  let headers = new Headers();
  headers.append("Content-Type", "multipart/form-data");

  // 获取文件对象
  let file = File.fromPath(filePath);

  // 读取文件内容
  file.readText()
    .then((content) => {
      // 将文件内容分块
      let chunks = this.chunkString(content, 1024);

      // 逐个发送文件块
      for (let i = 0; i < chunks.length; i++) {
        let chunk = chunks[i];

        // 创建表单数据
        let formData = new FormData();
        formData.append("file", chunk);

        // 发送HTTP请求
        http.post("http://your-upload-url", formData, { headers: headers })
          .subscribe((response) => {
            console.log(response);
          }, (error) => {
            console.log(error);
          });
      }
    })
    .catch((error) => {
      console.log(error);
    });
}

// 辅助方法：将字符串分块
chunkString(str: string, size: number) {
  let chunks = [];
  for (let i = 0; i < str.length; i += size) {
    chunks.push(str.slice(i, i + size));
  }
  return chunks;
}

let filePath = "/path/to/file";
this.uploadFile(filePath);