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']);