title: Make a permanet arg in js like angular $scope
body: <p>I have seen permanent arguments in AngularJS like $scope</p>
  
  <pre><code>var app = angular.module("app",[]);
  app.conntroller("ctrl",function($scope){
      $scope.name = "Angular JS";
  });
  </code></pre>
  
  <p>And when "$scope" is renamed to another text like 'scope' and it does not work. But my question is not about angular js. My question is: How do I make a function to parse permanent argument in js?</p>