angularjs单选按钮组有自己的模型

<div ng-app="myApp" ng-controller="myCtrl">
  <label>
    <input type="radio" ng-model="selectedOption" value="option1"> Option 1
  </label>
  <label>
    <input type="radio" ng-model="selectedOption" value="option2"> Option 2
  </label>
  <label>
    <input type="radio" ng-model="selectedOption" value="option3"> Option 3
  </label>
</div>

<script>
  var app = angular.module('myApp', []);
  app.controller('myCtrl', function($scope) {
    $scope.selectedOption = "option1"; // 默认选中Option 1
  });
</script>