How to do sliding verification?

Question

Nowadays, many websites have a sliding verification under the registration form to replace the previous verification code input. If you slide the small icon to the corresponding position of the large image, you will pass the verification. How is this done?

Answer 1

I just made one using thinkphp6. You can take a look. The code address is: https://www.yunmasucai***/code/show/17.html