js separate file

gistfile1.jsp

// script.js
(function(exports){
  
  // public function
  // can be accessed outside of this file
  exports.publicFunction = function(param1, param2){
  
  };
  
  // private function
  // visible only inside this function(closure)
  function privateFunction(){
    
  }
  
})(window);

// page.jsp
..
<script src="/path/to/file/script.js"></script>
<script>
  publicFunction(${someParamFromModel}, otherParam);
</script>