SOURCE

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

abc.controller('abc_control',function($scope){
  $scope.ddd = 123; 
  $("#clickone").click(function(){
    $scope.ddd = 789;
    $scope.$digest();
  })
})

<div ng-app='abc'>
  <div ng-controller="abc_control">
    {{ddd}}
    <a id="clickone">clickone</a>
  </div>
</div>
<script src="http://cdn.bootcss.com/angular.js/1.5.8/angular.min.js"></script>