Angular: Empty Fiddle

http://angularjs.org/

by witq

HTML

<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.2.20/angular.min.js"></script>
<div ng-controller="MyCtrl">
    <pre ng-bind="model | json"></pre>
</div>

JavaScript

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

myApp.controller('MyCtrl', function($scope, $interval) {
    
    $interval(function() {
        $scope.a = Math.random() * 700 + 1;
        $scope.b = Math.random() * 700 + 1;
    }, 2000);
    
    $scope.$watch('[a,b]', function(newValue, oldValue) {
        $scope.model = {
            new: newValue,
            old: oldValue
        }
    }, true);
    
});