var app = angular.module('myApp', [])
.run(function ($rootScope) {
$rootScope.name = 'Pascal';
});
<!DOCTYPE html>
<html ng-app="myApp">
<head>
<meta charset="utf-8" />
<title>AngularJS Plunker</title>
<script>document.write('<base href="' + document.location + '" />');</script>
<script data-require="angular.js@1.3.x" src="https://code.angularjs.org/1.3.0/angular.js" data-semver="1.3.0"></script>
<script src="app.js"></script>
</head>
<body>
<p>Hello {{::name}}!</p>
<button ng-click="name = 'Christoph'">Click me!</button>
</body>
</html>