index.html

<!DOCTYPE html>
<html>
<head>
    <title></title>
    <script type="text/javascript" src="https://ajax.googleapis.com/ajax/libs/angularjs/1.1.5/angular.js"></script>
    <script src="controllers/HomeController.js"></script>
    <script src="app.js"></script>
</head>

<body ng-app="AngularApp1">
<form>
    <div ng-controller="NameSpace1.HomeController">

        <label>
            {{firstName}}
        </label>


        <input type="button" ng-click="show()" value="btn"/>
        <br>

        <input type="text" ng-model="lastName">
        <br/>

        <label>
            {{lastName}}
        </label>

        <div ng-show="calcular()" style="width:300px; background-color:gold; display: block;">
            {{firstName}}; {{lastName}}
        </div>

    </div>
</form>

</body>
</html>