code: @RequestMapping(value = "/userLogout", method = RequestMethod.GET)
      @ResponseBody
      public JsonObject<?> logout(HttpServletResponse response) {
          JsonObject<?> ret = JsonObject.create();
          CookieUtils.resetCookieValue(response, UserWebConstant.CookieKey.USERNAME.getValue());
          CookieUtils.resetCookieValue(response, UserWebConstant.CookieKey.PWDMD5.getValue());
          return ret;
      }
docs: 退出
  
  @param response 返回response
  
  @return JsonObject