线段裁剪：
点击线段裁剪下的划线，画一条线段；
再点击矩形裁剪，进行线段裁剪。-Line Clipping: Click under the cut line segment, draw a line segment then click the rectangular cutting, for Line Clipping.
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001972s ]
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:0.085790s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.002127s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.001910s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.002128s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003720s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001990s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003301s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014732s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.002167s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 202384 [ RunTime:0.001178s ]
