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Cross-browser support

You may have spent several hours or even days solving the cross-browser bugs. Why should you spend time for this instead of focusing on your business functionality? Rather, if you use a good JavaScript framework, such as Ext JS, it will take care of most of these tasks, and you can focus on the business functionality.

Rich UI components

Ext JS comes with a huge number of rich UI control...

From

Cover of Ext JS 6 By Example

Note

advantage of extjs