If you created Cocos2d-js native project.(if you dont create yet .pleas follow this link) You can run on Android and OS devices or simulators. Running project so easy

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cd directory/to/projectName
// its for compiling apps
cocos compile -p ios|mac|android|web
// its for running apps
cocos run -p ios|mac|android


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if you get error like  "Can't find iOS target" or "Can't find Mac target" .You can run with code shown  below  for  iOS platform . For this example FirstCocosGame is project name. You must change with your own.

 cocos run  --platform ios  -t FirstCocosGame-mobile

for Mac platform

cocos compile --platform mac -t FirstCocosGame-desktop