微信幸运转盘大抽奖源代码，包括了两大功能：一、转盘抽奖，二、获取记录查询。用微信小程序开发的Canvas绘制可配置的转盘抽奖。微信小程序感觉是个半成品，代码移植过程比较繁琐麻烦。`canvas` API 部分都被重写了。。。
`canvas` `z-index`不生效，永远在最上层，不支持`rotate`动画。
SHOW FULL COLUMNS FROM `jrk_downrecords` [ RunTime:0.001354s ]
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:0.093686s ]
SHOW FULL COLUMNS FROM `jrk_tagrecords` [ RunTime:0.001234s ]
SELECT * FROM `jrk_tagrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 20 [ RunTime:0.002099s ]
SHOW FULL COLUMNS FROM `jrk_member` [ RunTime:0.001245s ]
SELECT `id`,`username`,`userhead`,`usertime` FROM `jrk_member` WHERE `status` = 1 ORDER BY `usertime` DESC LIMIT 10 [ RunTime:0.003642s ]
SHOW FULL COLUMNS FROM `jrk_searchrecords` [ RunTime:0.001057s ]
SELECT * FROM `jrk_searchrecords` WHERE `status` = 1 ORDER BY `num` DESC LIMIT 5 [ RunTime:0.003354s ]
SELECT aid,title,count(aid) as c FROM `jrk_downrecords` GROUP BY `aid` ORDER BY `c` DESC LIMIT 10 [ RunTime:0.014587s ]
SHOW FULL COLUMNS FROM `jrk_articles` [ RunTime:0.001291s ]
UPDATE `jrk_articles` SET `hits` = 1 WHERE `id` = 298777 [ RunTime:0.001260s ]
