angularjs - $scope.watch does not work between two different angular pages -


the below code working within 1 page different controlloers, scope.watch not work when pass value 1 page another. how can that? below code.

 .factory('data', function () {      var data = {         lastname: '',     }     return {         getlastname: function () {             return data.lastname;         },         setlastname: function (lastname) {             data.lastname = lastname;         }     } }     //first controller     $scope.lastname = '';     $scope.$watch('lastname', function (newvalue2, oldvalue2) {         if (newvalue2 !== oldvalue2)             data.setlastname(newvalue2);     });     //get first controller second     $scope.$watch(function () {         return data.getlastname();     }, function (newvalue2, oldvalue2) {         if (newvalue2 !== oldvalue2)             $scope.lastname = newvalue2;     });     //form     //firstcontroller     < input type = "text"              name="lastname"              placeholder = "suhr"              ng-model="lastname"             ng-minlength="3" required />

porting code , works!

angular.module("test", [])    .controller('test1', test1)    .controller('test2', test2)    .factory('data', data);    function test1($scope, data) {    $scope.lastname = '';      $scope.$watch('lastname', function(newvalue2, oldvalue2) {      if (newvalue2 !== oldvalue2)        data.setlastname(newvalue2);    });  }    function test2($scope, data) {    $scope.$watch(function() {      return data.getlastname();    }, function(newvalue2, oldvalue2) {      if (newvalue2 !== oldvalue2)        $scope.lastname = newvalue2;    });  }    function data() {    var data = {      lastname: '',    }      return {      getlastname: function() {        return data.lastname;      },      setlastname: function(lastname) {        data.lastname = lastname;      }    }  }
<script src="https://ajax.googleapis.com/ajax/libs/angularjs/1.5.8/angular.min.js"></script>    <div ng-app="test">    <div ng-controller="test1">      <input type="text" name="lastname" ng-model="lastname" placeholder="suhr" ng-minlength="3" required>    </div>      <div ng-controller="test2">      {{lastname}}    </div>  </div>


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