how disable compression for a specific javascript?

The COMPRESS::disable in the first rule won't work without the selective compression profile, which is why you're seeing all of the files compressed. It's listed as only working with that profile selected on the wiki

http://devcentral.f5.com/wiki/default.aspx/iRules/COMPRESS__disable.html

So I would think that the best bet would be to try and use selective compression and enabling compression for everything except the particular file you don't want compressed.

I would maybe try something like this

rule salvo_selective_compress_enable {
   when HTTP_REQUEST {
        if { ([HTTP::host] eq "1.1.1.1") and ([HTTP::uri] eq "/salvo/1.js") } {
            log local0. "compression_rule_disable"
            COMPRESS::disable 
        }
        else {
            COMPRESS::enable
        }
   }
}