ng-change checkbox angular

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular.min.js"></script>

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.6.9/angular-sanitize.js"></script>

<div ng-app="myApp"  ng-controller="myCtrl">

<input type="checkbox" ng-model="is_Checked" ng-change="doCheckSel()">

</div> <!-- ng-app="myApp" -->

<script>

var app = angular.module("myApp",  ['ngSanitize']);

app.controller('myCtrl', function($scope, $http,$interval){

    //==== start

   $scope.is_Checked=true;

    $scope.doCheckSel= function () {

        alert($scope.is_Checked);

    }//doCheckSel

});//start app.controller

</script>