Angular js :如何在单击时更改accordion活动的颜色

<button ng-click="changeColor()">点击我</button>

angular.module('myApp', [])
  .controller('myController', function($scope) {
    $scope.changeColor = function() {
      // 修改accordion的CSS样式
      // 例如，将活动的accordion背景颜色设置为红色
      document.getElementById('accordion').style.backgroundColor = 'red';
    };
  });

<div ng-app="myApp" ng-controller="myController">
  <button ng-click="changeColor()">点击我</button>
  <div id="accordion">这是一个accordion</div>
</div>