অ্যাঙ্গুলারজেএস ng-class

<!DOCTYPE html>
<html ng-app="app">
<head>
  <style>
    .active {
      color: green;
    }
  </style>
</head>
<body>

  <div ng-controller="app">
    <p ng-class="{active: isActive}">প্রোগ্রামিং শিখুন</p>
    <button ng-click="isActive = !isActive">টুগল</button>
  </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.isActive = false;
      });
  </script>

</body>
</html>