code: func PostJSON(uri string, obj interface{}) ([]byte, error) {
  	jsonData, err := json.Marshal(obj)
  	if err != nil {
  		return nil, err
  	}
  
  	jsonData = bytes.Replace(jsonData, []byte("\\u003c"), []byte("<"), -1)
  	jsonData = bytes.Replace(jsonData, []byte("\\u003e"), []byte(">"), -1)
  	jsonData = bytes.Replace(jsonData, []byte("\\u0026"), []byte("&"), -1)
  
  	body := bytes.NewBuffer(jsonData)
  	response, err := http.Post(uri, "application/json;charset=utf-8", body)
  	if err != nil {
  		return nil, err
  	}
  	defer response.Body.Close()
  
  	if response.StatusCode != http.StatusOK {
  		return nil, fmt.Errorf("http get error : uri=%v , statusCode=%v", uri, response.StatusCode)
  	}
  	return ioutil.ReadAll(response.Body)
  }
docs: //PostJSON post json 数据请求