binwind8/tncode

I believe in Taobao, betta these big sites have seen such a verification code, drag the verification code than the traditional mobile side has a better test to reduce the user's input. Verification code: third party charges drag code, betta, panda live and many other sites are using this verification code. Or the charges. I feel very strange, such a large site, actually this function should use a third party, it should be no difficulties to achieve it, so I would like to do with php + js to do the same function, the name is called tncode it, 39 verification code, ha ha! The main technology to achieve: 1, php cutout 2, js canvas drawing 3, crack interference

tncode's Issues

存在两个bug

存在两个bug；
1、加载页面完成后， 不显示小的抠图， 只有点击、或者拖动时 才会显示正常的抠图！

2、js报错， $TN.onsuccess 报$TN 不存在！！！

不太稳定，拖动成功后，重新校验的时候偶尔拖动的小方块不会出现

Java版本

https://gitee.com/mumangguo/tncode

拖鞋大大，请问为何图片加载不出来

报错异常为：Uncaught DOMException: Failed to execute 'drawImage' on 'CanvasRenderingContext2D': The HTMLImageElement provided is in the 'broken' state.