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自定义url示例：
/home.php/exam-scan-a05?etag=ex300-home
/home.php/exam-scan-a10
/home.php/exam-scan-a20?mix=tfsin
/home.php/exam-scan-a50
/home.php/exam-scan-a10_sin
/home.php/exam-scan-a05_mul
/home.php/exam-scan-a05_tf
/home.php/exam-scan-a05_fb
/home.php/exam-scan-c2a
/home.php/exam-scan-c2b
/home.php/exam-scan-c2c?qrsize=8
/home.php/exam-scan-c4a
/home.php/exam-scan-c4b
/home.php/exam-scan-c4c?hide=1
/home.php/exam-scan-c8a
/home.php/exam-scan-c8b
/home.php/exam-scan-c8c
/home.php/exam-scan-ts2
/home.php/exam-scan-tcx
参数说明：
* 参数组合示范：?erank=com&etag=ex300-pub,ex300-home&mix=tfsin&qrsize=6&hide=1
* erank=com,场景类别(com-通用,low-基础,xiao-小学,chu-初中,gao-高中,family-家庭,sup-竞赛,custom-定制,rare-冷门)
* etag=ex300-home,场景标记(自定义如:ex300-home，多个用`,`分开)
* mix=tfsin,混合判断单选题目
* qrsize=8,设置二维码大小
* hide=1,隐藏本提示信息