AngularJS scope Example

HTML

<div ng-app="">
  <div ng-controller="Controller">
     {{checkbox}}
      <input type="checkbox" ng-model="checkbox" ng-true-value="1" ng-false-value="0" ng-checked="checkbox == 1" />
  </div>
</div>

JavaScript

function Controller($scope) {
    $scope.checkbox = 1;
    
    $scope.$watch(function(){
        return $scope.checkbox;
    }, function(){
        $scope.checkbox = Number($scope.checkbox);
        console.log($scope.checkbox, typeof $scope.checkbox);
    },true);
}