Logging with $log

$log

angular.module('DemoApp', [])
    .controller('DemoController', ['$log', function($log) {
        $log.debug("Some debug");
        $log.info("Some info");
        $log.log("Some log");
        $log.warn("Some warning");
        $log.error("Some error");
    }]);

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport"
     content="width=device-width, initial-scale=1, user-scalable=yes">
  <script src="angular.min.js"></script>
  <script src="logging.js"></script>
</head>
<body ng-app="DemoApp" ng-controller="DemoController">
 <h1>Open the console!</h1>
 
</body>
</html>