  var b = document.createDocumentFragment();

                a.innerHTML = strHtml;
                while ((i = a.firstChild)) {
                    b.appendChild(i);
                }

                return b;
            }

            var miniRefresh = new MiniRefresh({
                container: '#minirefresh',
                down: {
                    callback: function() {
                        // 每次下拉刷新后，默认情况上拉的状态会被自动重置
                        ajaxD