Angularjs，获取ng-show的离子单选按钮值？

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

var app = angular.module('myApp', []);
app.controller('myCtrl', function($scope) {
  $scope.showValue = 'option1'; // 默认选中的值

  $scope.$watch('showValue', function(newValue, oldValue) {
    console.log(newValue); // 在控制台打印ng-show的值
  });
});