javascript - Scope object doesn't change without $scope in Angularjs -

i've set small fiddle here http://jsfiddle.net/spmft/137/ , wondering if explain me why changing object doesn't work, while changing properties of object, or changing object "$scope" in front works.

the reason try avoid using scope in controller functions easier test.

my real task ng-click="reset(current, master)"

$scope.reset = function (current, master) { angular.copy(current, master); } 

this doesn't work, whereas works:

$scope.reset = function (current, master) { angular.copy($scope.current, master); } 

both $scope.current , $scope.master exist

cheers

update:

my problem wasn't updating object itself. solve problem use e.g.

angular.extend(data, { name: 'change', game:'change' }); 

or

angular.copy({ name: 'change', game:'change' }, data);//pay attention order 

the reason creating new object (and therefore different reference) , assigning local variable previously pointing same object.

$scope.change = function (data) {     data = { name: 'change', game:'change' }; } 

the data variable passed holds reference same object of $scope.data assigning local variable pointing reference of object a new object b, locally. @ point, $scope.data still holds reference same object has before. doing changing reference local variable , discarding @ end of function.

in specific case, should work (using current or $scope.current). believe inverting parameter in angular.copy should (source, destination). see updated fiddle simple demo.