手势验证

recaptcha

https://www.vaptcha.com/

https://www.vaptcha.com/document

https://www.iviewui.com/components/switch
https://run.iviewui.com/

Google ReCAPTCHA

https://www.google.com/recaptcha/api2/demo

reCAPTCHA

Completely Automated Public Turing Test To Tell Computers and Humans Apart，区分人机的全自动图灵测试系统

https://www.ifanr.com/1145907

refs

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