/// <summary>
        /// 调度任务,
        /// 根据cron表达式执行
        /// </summary>
        /// <param name="jobDetail">任务明细</param>
        /// <param name="cron">cron表达式</param>
        public static void Schedule(IJobDetail jobDetail, string cron)
        {
            if (!_Scheduler.CheckExists(jobDetail.Key).Result)
            {
                //创建触发器
                ITrigger trigger = TriggerBuilder.Create().WithCronSchedule(cron).Build();

                //为调度者添加任务与触发器
                _Scheduler.ScheduleJob(jobDetail, trigger);

                //开始调度
                _Scheduler.Start();
            }
            else
            {
                _Scheduler.ResumeJob(jobDetail.Key);
            }
        }