如何在AngularJS产品库中处理条件子类别

$scope.subcategories = [];

$scope.filterSubcategories = function(mainCategory) {
  // 清空子类别数组
  $scope.subcategories = [];

  // 根据主类别过滤子类别
  if (mainCategory === '电子产品') {
    $scope.subcategories = ['手机', '电视', '电脑'];
  } else if (mainCategory === '家居用品') {
    $scope.subcategories = ['家具', '厨具', '装饰品'];
  } else if (mainCategory === '服装') {
    $scope.subcategories = ['男装', '女装', '童装'];
  }
};

<select ng-model="selectedMainCategory" ng-change="filterSubcategories(selectedMainCategory)">
  <option value="">选择主类别</option>
  <option value="电子产品">电子产品</option>
  <option value="家居用品">家居用品</option>
  <option value="服装">服装</option>
</select>

<ul>
  <li ng-repeat="subcategory in subcategories">{{subcategory}}</li>
</ul>