JSBでC++のmapをJavascriptのオブジェクトとして返す方法 ref: http://qiita.com/g-1/items/7d52cef20e37ccf5dd2c

file0.cpp

JSObject *object = JS_NewObject(_cx, NULL, NULL, NULL );
JSBool result = JS_TRUE;
std::map< std::string, std::string >::const_iterator it = params.begin();
while(it != params.end()){
  CCLOG("%s => %s",it->first.c_str(), it->second.c_str());
  JSString* jsValue = JS_NewStringCopyN(_cx, it->second.c_str(), it->second.length());
  result &= JS_DefineProperty(_cx, object, it->first.c_str(), STRING_TO_JSVAL(jsValue), NULL, NULL, JSPROP_ENUMERATE | JSPROP_PERMANENT);
   ++it;
}