code: public static <T extends JobBean> SchedulingMetaInfo newIntervalSchedulingMetaInfo(Class<T> jobClass, 
  			String jobName, long interval) {
  
  		return newIntervalSchedulingMetaInfo(jobClass, jobName, DEFAULT_JOB_GROUP, DEFAULT_TRIGGER_GROUP, interval, -1);
  	
  	}
docs: 默认延迟40s开始执行。