点点图片验证码，求指教！该如何处理
点点图片验证码，求指教！
通过点击图片来输入验证码，而不是输入数字
demo
------解决方案--------------------
------解决方案--------------------
想法比较新颖，但也有些问题：
1、图片中的数字只是加个圈，不做扭曲变形处理，肯定是不行的，很容易被识别；
2、返回给服务器的是坐标，给图片中的数字加上圈之后，坐标不是更容易通过识别获得吗？因为只有4个数字，排序成功的概率也就提高了；
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