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真正安全度高的验证码，而且是广告验证码，告别 12306 奇葩验证
source link: https://www.v2ex.com/t/556821
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推广 - @bengougo - 大家登陆 V2e 就会遇到输入字符的验证码，相信很多人会吐槽吧，12306 的验证码更是让大家心酸。验证码如果能变成广告，那么，这样的广告效果肯定很好。先不要吐槽，当年动过这样“歪脑筋”的宇初验证已经
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