YYTH

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继承ArithmeticCaptchaAbstract类,重写alphas()方法,把减号去掉就可以了 ![image](https://user-images.githubusercontent.com/35692200/77714819-f62ca800-7014-11ea-8a50-b35e21d91e07.png)

captchaId由前端生成,校验时前端带着key来校验