This repository is a collection of web scraping and anti-crawler reverse engineering practice scripts targeting over 40 Chinese websites. Each site has a dedicated folder containing a Python script (demo.py) that orchestrates scraping by executing a JavaScript file (demo.js) via execjs. The JavaScript files implement cryptographic algorithms (AES, RSA, MD5, SHA, etc.) extracted from the target websites to generate request signatures, encrypt passwords, or decrypt responses. The project is primarily a learning resource for reverse engineering techniques, not a production scraping framework. It includes documentation for each case, a changelog tracking API changes, and some utility scripts. The code is ad-hoc, tightly coupled to specific sites, and lacks tests or error handling, making it fragile and high-maintenance. While the individual scripts are functional, they are not reusable without significant adaptation due to hardcoded keys and site-specific logic.