Angular: Empty Fiddle

http://angularjs.org/

HTML

<script src="http://code.angularjs.org/angular-1.0.1.js"></script>
<div ng-controller="MyCtrl">
  var1 = {{var1}}, var2 = {{var2}}
  <div ng-class="{'red': (var1 && var2)}">
    Hello!
  </div>
</div>

CSS

.red {
  background: red;
}

JavaScript

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

//myApp.directive('myDirective', function() {});
//myApp.factory('myService', function() {});

function MyCtrl($scope) {
    $scope.var1 = true;
    $scope.var2 = true;
}