var app = angular.module('app', []);
app.controller('controller', ['$scope', function($scope) {
}])
<!DOCTYPE html>
<html lang="en" ng-app="app">
<head>
<meta charset="UTF-8" />
<title>
Document
</title>
<script src="https://cdn.bootcss.com/angular.js/1.6.4/angular.min.js">
</script>
</head>
<body ng-controller="controller">
</body>
</html>