angularjs – Angular：从视图中调用函数

在我看来,我调用了一个函数prepareDynamicData(itemMenu);

<div ng-repeat="itemMenu in menuDetailsData.categories" class="headDetails fontH2">
            <div style="display: none">{{prepareDynamicData(itemMenu)}}</div>
            <a href="#" ng-show="dynamicData.expand">{{itemMenu.name}}</a>
            <div ng-repeat="cat in dynamicData.data">
                <p>{{cat.name}}</p>
                <div class="articles">
                    <div ng-repeat="art in cat.items" class="article">
                        <div class="price">
                            <div></div>
                            <span><i>₪</i>{{art.price}}</span>
                        </div>
                        <div class="artDescr">
                            <span class="fontTitle">{{art.title}}</span>
                            <p class="fontDetails">{{art.description}}</p>
                        </div>
                    </div>
                </div>
            </div>
        </div>

我知道顶循环只重复2次(验证),但函数prepareDynamicData(itemMenu)调用4次,不知道为什么！？这是我的控制器：

function MenuItemCtrl($scope,$routeParams,$http,$location,sharedData) {
if (sharedData.getMenuDetails() == null) {
    $location.path('/menu');
    return;
}
else {
    $scope.menu = sharedData.getMenu();
    $scope.menuDetailsData = sharedData.getMenuDetailsData($routeParams.itemId);
}

$scope.dynamicData = {
    data : new Array(),expand : false
};

$scope.prepareDynamicData = function (itemMenu) {
    if (itemMenu.items != null) {
        $scope.dynamicData.data[0] = itemMenu;
        $scope.dynamicData.expand = false;
    }
    else {
        $scope.dynamicData.data = itemMenu.categories;
        $scope.dynamicData.expand = true;
    }
}

}

你能帮我澄清一下它为什么会发生！谢谢