利用红外线传感器完成小车的循迹功能，效果很好，小车速度快，且运行平稳-The use of infrared sensors for tracking the completion of car features, very good, fast car, and the smooth operation
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.012975s ]
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:0.160677s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002638s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001174s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001046s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003406s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000858s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003806s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.016017s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001056s ]
UPDATE `jrk_articles` SET `hits` = 2 WHERE `id` = 174871 [ RunTime:0.011052s ]
