如何在中继器中使用复选框AngularJs计算值

<form ng-app="myApp" ng-controller="myCtrl">
  <label>
    <input type="checkbox" ng-model="checkboxValue1"> 复选框1
  </label>
  <label>
    <input type="checkbox" ng-model="checkboxValue2"> 复选框2
  </label>
</form>

var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
  $scope.calculateValue = function() {
    var value1 = $scope.checkboxValue1 ? 1 : 0;
    var value2 = $scope.checkboxValue2 ? 2 : 0;
    $scope.totalValue = value1 + value2;
  };
});

<form ng-app="myApp" ng-controller="myCtrl">
  <label>
    <input type="checkbox" ng-model="checkboxValue1" ng-change="calculateValue()"> 复选框1
  </label>
  <label>
    <input type="checkbox" ng-model="checkboxValue2" ng-change="calculateValue()"> 复选框2
  </label>
  <p>计算结果：{{totalValue}}</p>
</form>