Meituan merchants require a verification code when entering to view the menu, which is set up to prevent scripts from swiping orders and ensuring user account security. The function of the verification code is to prevent malicious cracking of passwords, ticket fraud, order fraud, and forum flooding. It can effectively prevent a hacker from using a specific program to violently crack a specific registered user from making continuous login attempts. In fact, the use of verification codes is now common on many websites. We implemented this function in a relatively simple way.