title: angularjs directive variable reference
body: <p>I really don't no this angularjs variable working.</p>
  
  <p>look at the my code -> <a href="http://jsfiddle.net/a9etkyz7/1/" rel="nofollow">http://jsfiddle.net/a9etkyz7/1/</a></p>
  
  <p>$scope.ref and $scope.ref2 is not working!</p>
  
  <p><code>$scope.ref= $scope.a</code></p>
  
  <p>this is not reference? </p>
  
  <p>this is copy?</p>
  
  <p>please tell me answer </p>