定时减法计数。输入数据0到9之间三位数，开始计时，每秒减一。当计数完成时，可做二次开发。还可做简单加减法-Timing counts subtraction. Input data between the three-digit 0-9, start running, by one per second. When the count is complete, do the secondary development. Also to do simple addition and subtraction
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.002893s ]
SELECT `a`.`aid`,`a`.`title`,`a`.`create_time`,`m`.`username` FROM `jrk_downrecords` `a` INNER JOIN `jrk_member` `m` ON `a`.`uid`=`m`.`id` WHERE `a`.`status` = 1 GROUP BY `a`.`aid` ORDER BY `a`.`create_time` DESC LIMIT 10 [ RunTime:0.143028s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002975s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002221s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002740s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.004004s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.002471s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003523s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016475s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002925s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 126432 [ RunTime:0.001437s ]
