手势验证
recaptcha
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
refs
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