settimeout in angular

// var that = this;                             // no need of this line
this.messageSuccess = true;

setTimeout(()=>{                           //<<<---using ()=> syntax
      this.messageSuccess = false;
 }, 3000);

function myClick() {
  setTimeout(
    function() {
      document.getElementById('div1').style.display='none';
      document.getElementById('div2').style.display='none';
    }, 5000);
}

var myapp = angular.module("myapp", []);

myapp.controller("DIController", function($scope, $timeout){

    $scope.callAtTimeout = function() {
        console.log("$scope.callAtTimeout - Timeout occurred");
    }

    $timeout( function(){ $scope.callAtTimeout(); }, 3000);
});