Saludo

<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Saludos desde angular</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" 
integrity="sha384-WskhaSGFgHYWDcbwN70/dfYBj47jz9qbsMId/iRN3ewGhXQFZCSftd1LZCfmhktB" crossorigin="anonymous">

</head>
<body ng-app="myApp" ng-controller="holaController">

 


Escribe tu nombre:<input type="text"   ng-model="nombre" />

<div class="alert alert-primary" role="alert">
  <h3>Hola  "{{nombre}}" </h3>
</div>


<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.4.4/angular.js"></script>
<script type="text/javascript" src="js/controller/holaController.js"></script>
</body>
</html>


angular.module('myApp', []).
controller('holaController', function($scope) {
$scope.nombre="";
});