本源码实现了一个三维空间向量类，该类对空间三维向量进行了，比如加、减，叉乘等基本运算。-The source to achieve a three-dimensional vector space categories, such three-dimensional vector space, such as add, subtract, take fork and other basic computing.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001221s ]
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:0.085213s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001146s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001918s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001154s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003594s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.000990s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003265s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.015903s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001380s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 280783 [ RunTime:0.001501s ]
