introduce:
1. The entire program consists of three files (database, web page, md5 file)
2. Administrator functions (modify, delete, reply, view IP, modify administrator username and password)
3. The administrator password is encrypted using md5.
4. Use JS judgment and add comments to the calling code for easy modification.
5. Prevent external submission of data. Prevent shielding JS from submitting data.
6. You can set the return address after processing data.
7. The web page can be placed on any page and called at will.
8. The code is simple and suitable for learning and research.
9. Character filtering of message content.
10. Default administrator username: admin Default password: admin88
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