Is there a way that allow me to use WinJS 2.0 inside a Windows 8 Apps?

Question

I see that there are a lot of improvements in WinJS 2.0, but our customer will not upgrade to Windows 8.1 immediately ,so I'm wondering if I can use WinJS 2.0 library but in VS2012 and a Windows 8 store app?

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Answer 1

No. If you want to use the Windows 8.1 features your app needs to target Windows 8.1.

--Rob

Answer 2

But If my app retargets Windows 8.1, can it still be able to run on Windows 8? 

Do you mean that I need to create 2 seperate versions of my app to support win8 and win8.1?

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Return to the source, learn the way!

Answer 3

Windows 8.1 apps require Windows 8.1 and will not run on Windows 8. Windows 8 apps run on both Windows 8 and Windows 8.1 but can use only Windows 8 features.

You will need to maintain two versions if you want one to use Windows 8.1 features on Windows 8.1 and one to run on Windows 8.

--Rob