堆栈的实现代码，实现了栈的所有功能，PUSH，POP，插入，销毁，清空等，有调试程序，可以很清楚的看到栈的运行过程-Realize stack code, realize all the features of the stack, PUSH, POP, insertion, destruction, empty and so on, have a debugger, you can clearly see the operation of the process stack
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001641s ]
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:0.095727s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001301s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002005s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001306s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003798s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001106s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003326s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015555s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001594s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 225970 [ RunTime:0.001499s ]
