/// <summary>
        /// 清空执行环境状态数据
        /// </summary>
        public void cleanUp()
        {
            string message = string.Empty;

            if (_WebDriver == null)
            {
                return;
            }

            clearAllCookies();
            try
            {
                _WebDriver.Quit();
            }
            catch (Exception ex)
            {
                message = string.Format("Exit webdriver faild,error message<{0}>.", ex.Message);
                _SystemLog.writeLog2Console(LOG_LEVEL.ERR, message);
            }

            try
            {
                _WebDriver.Dispose();
            }
            catch (Exception ex)
            {
                message = string.Format("Dispose webdriver faild,error message<{0}>.", ex.Message);
                _SystemLog.writeLog2Console(LOG_LEVEL.ERR, message);
            }

            _WebDriver = null;

            CPublic.killProcess(PhantomjsDriverProcessId);
        }