Is there a deploy module in node.js could merge my javascript and css file
or compress javascript and css file and so on.
cuz I deploy my application at Platform-as-a-Service like appfog
so I can't expect the server itself could help me do that
mybe the module could?
This article on underappreciated NPM commands looks to skim over just what you're looking for. Specifically the ability to use preinstall hooks:
"scripts": {
"preinstall": "./bin/custom-script.sh"
}
http://mechanics.flite.com/blog/2012/12/11/underappreciated-npm-commands/