Untitled

// router.js

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

// configure our routes
app.config(function($routeProvider) {
$routeProvider

// route for the home page
    .when('/', {
        templateUrl : 'templates/main.html',
        controller  : 'mainController'
    })
});

// index.js
<BODY ng-app="app">

{{2 + 2}}

<ng-view></ng-view>