验证码是一个方法告诉区别人类和机器之间使用一个诡辩形象和要求用户输入corrisponding文本到文本框中。有许多不同的implimentations Captcha的在互联网上一些更安全-Verification code is a way to tell the difference between humans and machines using a sophism corrisponding image and requires users to enter text into th