For example if you make any variable global then it will accessible from everywhere & in case of local variable only local accessible are present same like $scope & $rootScope. $scope is created with ng-controller while $rootscope is created with ng-app. Here we give an example of the $rootScope. you have to also notice that controller's color variable does not overwrite the rootScope's color value in below example.
rootScope in Angualr JS
<html>
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.8/angular.min.js"></script>
<body ng-app="myApp">
<div>I am not in any controller </div>
<p>rootScope Properties Call :- {{color}}</p>
<div ng-controller="myCtrl">
<fieldset>
<legend>
I am in Controller
</legend>
<p>Controller Properties Call :- {{color}}</p>
<p>rootScope Properties Call :- {{$parent.color}}</p>
</fieldset>
</div>
<div>Again i am not in any Controller </div>
<p>rootController property color is called :- {{color}}</p>
<script>
var app = angular.module('myApp', []);
app.run(function($rootScope) {
$rootScope.color = 'blue';
});
app.controller('myCtrl', function($scope) {
$scope.color = "red";
});
</script>
</body>
</html>
output of rootScope in Angualr JS
I am not in any controller
rootScope Properties Call :- blue
Again i am not in any Controller
rootController property color is called :- blue
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