ExtJs: Pros, Cons & Precautions

ExtJs is an open-source front-end framework based on JavaScript that offers a wide range of interface components and robust data processing capabilities.

1. ExtJs offers a powerful library of interface components, including tables, forms, menus, and windows, which allow for the quick construction of complex user interfaces.
2. Data processing capabilities: ExtJs offers a variety of data processing features, including data binding, validation, sorting, filtering, pagination, etc., making it easy for developers to handle and display large amounts of data.
3. ExtJs utilizes the Model-View-Controller (MVC) architecture, separating data, interface, and business logic to enhance code readability and maintainability.
4. Cross-browser compatibility: ExtJs can run on various mainstream browsers while maintaining consistent interface effects and user experience.
5. Extensibility: ExtJs offers a rich plugin mechanism, allowing developers to customize components or functionalities as needed, thereby expanding the framework’s capabilities.

However, there are some drawbacks and considerations when using ExtJs.

1. The learning curve is steep: Due to ExtJs having a lot of features and a complex API, using it requires a certain amount of learning cost, especially for beginners.
2. File size is relatively large: Due to the many features and components provided by ExtJs, the framework itself has a large file size, which may increase page loading time.
3. Commercial License: While ExtJs is open source, commercial use requires purchasing a commercial license, otherwise you may violate the framework’s usage agreement.
4. Compatibility issues: While ExtJs runs well on most browsers, there may be compatibility issues on certain older versions of browsers.

In conclusion, using ExtJs can quickly build complex frontend interfaces and data processing functions, but one should be mindful of the learning curve, file size, and commercial licensing issues.