希望做到每點擊一次加載按鈕，就請求一次數據，數據加在上次的數據之上，實現下拉加載，應該怎么做？//數據循環(huán)列表<ul class="mui-table-view news-list">    <li ng-repeat="item in items">        <a href="news-detail.html">            <h3 ng-bind="item.title"></h3>        </a>    </li>    <button ng-click="loadPage()" type="button">加載</button></ul>//發(fā)起請求var page = 0;function loadPage(){                var url=domain+'/school/opinion/list?currentPage='+page+"&deviceType=WECHAT";        $http.get(url,{},{'Content-Type':'application/x-www-form-urlencoded'}).then(function successCallback(response) {        $scope.items = response.data.data;            }, function errorCallback(response) {                   console.log(response.code)           });        page++;        }