অ্যাঙ্গুলারজেএস broadcast

<!DOCTYPE html>
<html ng-app="app">
<body>

  <div ng-controller="app">
    <button ng-click="send()">সেন্ড</button>
    <div ng-controller="child">
      <p>{{message}}</p>
    </div>
  </div>

  <script src="https://cdnjs.cloudflare.com/ajax/libs/angular.js/1.8.3/angular.min.js"></script>
  <script>
    angular.module("app", [])

      .controller("app", function($scope) {
        $scope.send = function() {
          $scope.$broadcast("message", "হ্যালো");
        };
      })

      .controller("child", function($scope) {
        $scope.$on("message", function(event, data) {
          $scope.message = data;
        });
      });
  </script>

</body>
</html>