HarmonyOS 鸿蒙Next http网络访问，参数问题

参考这个demo：

//public.ts
export default class Response {
  /**
   * 响应码
   */
  code:number
  /**
   * 响应消息
   */
  message:string
  /**
   * 响应数据
   */
  data:any
}

//http_request.ts 导入请求 
import http from '@ohos.net.http';
//响应格式
import Response from './public'
//导出去一个请求函数 使用axios风格请求数据、参数可自行增加
export function request(url:string,method: http.RequestMethod,data?:any): Promise<Response> {
  const BASE_URL =  "url"
  // const BASE_URL =  "http://api.common.smallfeiyu.cn"
  let httpRequest = http.createHttp();
  let responseResult = httpRequest.request ( BASE_URL+ url,{
    method: method,
    //请求头设置
    header: {
      'Content-Type': 'application/x-www-form-urlencoded'
    },
    //携带额外参数
    extraData: JSON.stringify(data),
  });

  let response = new Response();
  // 处理数据，并返回
  return responseResult.then((result: http.HttpResponse) =&gt; {
    if (result.responseCode === 200) {
      let res: Response = JSON.parse(`${result.result}`);
      response.data = res.data;
      response.code = res.code;
      response.message = res.message;
    } else {
      response.message = '请求错误';
      response.code = 400;
    }
    return response;
  }).catch((error) =&gt; {
    response.message = '请求错误';
    response.code = 400;
    return response;
  });
}

根据具体需要再进一步封装，post请求参考文档：https://developer.huawei.com/consumer/cn/doc/harmonyos-guides-V13/remote-communication-postnetworkrequests-V13