在使用angularjs的表单验证中至少选中一个复选框

<form name="myForm">
  <label>
    <input type="checkbox" name="checkbox1" ng-model="checkbox1"> Checkbox 1
  </label>
  <label>
    <input type="checkbox" name="checkbox2" ng-model="checkbox2"> Checkbox 2
  </label>
</form>

angular.module('myApp', [])
  .controller('myController', function($scope) {
    $scope.submitDisabled = true; // 初始禁用提交按钮

    $scope.checkSelection = function() {
      $scope.submitDisabled = !$scope.checkbox1 && !$scope.checkbox2;
    };
  });

<div ng-app="myApp" ng-controller="myController">
  <form name="myForm" ng-submit="submitForm()" novalidate>
    <label>
      <input type="checkbox" name="checkbox1" ng-model="checkbox1" ng-change="checkSelection()" ng-required="true"> Checkbox 1
    </label>
    <label>
      <input type="checkbox" name="checkbox2" ng-model="checkbox2" ng-change="checkSelection()" ng-required="true"> Checkbox 2
    </label>
    <button type="submit" ng-disabled="myForm.$invalid || submitDisabled">Submit</button>
  </form>
</div>