code: func (wxa *MiniProgram) GetAnalysisVisitDistribution(beginDate, endDate string) (result ResAnalysisVisitDistribution, err error) {
  	body := map[string]string{
  		"begin_date": beginDate,
  		"end_date":   endDate,
  	}
  	response, err := wxa.fetchData(getAnalysisVisitDistributionURL, body)
  	if err != nil {
  		return
  	}
  	err = json.Unmarshal(response, &result)
  	if err != nil {
  		return
  	}
  	if result.ErrCode != 0 {
  		err = fmt.Errorf("GetAnalysisVisitDistribution error : errcode=%v , errmsg=%v", result.ErrCode, result.ErrMsg)
  		return
  	}
  	return
  }
docs: // GetAnalysisVisitDistribution 获取用户小程序访问分布数据