angularjs onchange

HTML
<div ng-controller="TestCtrl">
<select ng-change="change(x)" ng-model="x">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
</select>
</div>

JS:
var app = angular.module('Demo', [], angular.noop);

app.controller('TestCtrl', function($scope){
$scope.change = function(x){
console.log(x);
}
});

angular.bootstrap(document, ['Demo']);