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把人逼疯的网页验证码,浪费你几百万小时,却让谷歌稳赚8000亿?
你应该也在上网时遇到过各种各样的“人机测试”,最早的比如识别出扭曲的字母和数字、选择图片上特定的字符、拼图游戏,随着技术的发展,这种人机测验也变得越来越花哨,给你上网增添了一些小乐趣(误)或者小阻碍。这种人机测验叫做CAPTCHA。关于CAPTCHA ...
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