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	<script src="//ajax.googleapis.com/ajax/libs/angularjs/1.2.15/angular.min.js"></script>
	<script type="text/javascript" src="script.js"></script>
	<link rel="stylesheet" type="text/css" href="estilo.css">
	<div ng-app="ngClass" ng-controller="ngClassController as cl">
		<h1 ng-class="cl.titular">Títular</h1>
		<select ng-model="cl.titular">
		<option value="pequenno">Pequeño</option>
		<option value="grande">Grande</option>
		<h2 ng-class="cl.clases">Control del valor</h2>
		¿Cuánto? <input type="text" ng-model="cl.cuanto" size="4" placeholder="0" />
		<br />
		<p ng-class="{positivo: cl.cuanto>=0, negativo: cl.cuanto<0}">
		El valor es <span>{{cl.cuanto}}</span>
              .negativo {
color: red;
.positivo {
color: #33f;
font-size: 10pt;
font-size: 18pt;
background-color: orange;
color: #fff;
font-size: 30px;
.module('ngClass', [])
.controller("ngClassController", controladorPrincipal);
function controladorPrincipal(){
//esta función es mi controlador
var cl = this;
cl.total = 0;

cl.titular = "pequenno"
cl.clases = ["fondo", "color", "tamanno"];
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