I want to know how can i use phonegap for game development?/
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You can find a tutorial on using Phonegap to build your exported game into a native app here
It mentions that performance can be low using Phonegap, but I'm working on a simple game that works fine on a Samsung Galaxy Ace (Android 2.3) after using Phonegap Build, so I guess it depends how complex and/or optimized you have made your game.