controller

<div controller="ExampleController">
        <p>{{foo}} <a href="javascript:void(0);" ng-click="alert()" styling="button">Alert!</a> </p>
    </div>
    <hr/>
    <div controller="Example2Controller">
        <p>{{bar}}</p>
    </div>

angular.module('lightning')
.controller('ExampleController', ['$scope','$timeout', function($scope,$timeout) {
            $scope.foo = 'bar';
            $scope.alert = function(){
            alert('Hello World!')
            };
        }])
.controller('Example2Controller', ['$scope','$timeout', function($scope,$timeout) {
            $scope.bar = 'foo';
        }]);