store the result of checkbox true/flase

i have got load of checkboxes which are by default checked. If user uncheck it then should store the value of it .How to do it? here m giving code for all elements are already checked.

$scope.isAllRecordSelected = function(record) {
  var checked = false;
  for (var i = 0; i < $scope.users.length; i++) {
    if (record === $scope.users[i]) {
      checked = true;

      $scope.users[i].selected = checked;
    }


  }
  return checked;
};

html :

<div ng-repeat="record in users">
  <div class="col-md-2 col-sm-2 col-xs-2">
    <label>
      <input type="checkbox" ng-model="isAllSelected"                          
              ng-change="userSelectedToggle()"             
              ng-checked="isAllRecordSelected(record)">             
    </label>
  </div>
  <div class="col-md-6 col-sm-6 col-xs-6">
    <div class="text-overflow">
      <span ng-model="record.dispalyName">  
             </span>
    </div>
  </div>
  <div class="col-md-4 col-sm-4 col-xs-4">
    <span ng-model="record.mobile">  </span>
  </div>
</div>