Page navigation bar in Angular.js

http://amitgharat.wordpress.com/2012/09/19/page-navigation-bar-in-angular-js/

HTML

<link rel="stylesheet" href="http://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/2.1.1/css/bootstrap.min.css">
<div class="well sidebar-nav" ng-app="navList" ng-controller="navCtrl">
    <span ng-class="firstClass()"> First Class </span>
    <br/>
    <span ng-class="secondClass()"> Second Class </span>
</div>

JavaScript

var navList = angular.module('navList', []);

navList.controller('navCtrl', ['$scope', '$location', function ($scope, $location) {
    $scope.firstClass = function () {
        console.log('firstClass');
        return 'label label-success' ;
    };     
    $scope.secondClass = function () {
        console.log('secondClass');
        return 'label' ;
    };     
    
}]);