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从构建分布式秒杀系统聊聊验证码-小柒2012
source link: http://blog.51cto.com/itstyle/2286975
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前言为了拦截大部分请求，秒杀案例前端引入了验证码。淘宝上很多人吐槽，等输入完秒杀活动结束了，对，结束了......当然了，验证码的真正作用是，有效拦截刷单操作，让羊毛党空手而归。验证码那么到底什么是验证码呢？验证码作为一种人机识别手段，其终极目的，就是区分正常人和机器的操作。我们常见的互联网注册、登录、发帖、领优惠券、投票等等应用场景，都有被机器刷造成各类损失的风险。目前常见的验证码形式多为图片验
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