Demo中选项卡切换+下拉刷新，怎么判断是哪个选项卡触发的，加载不通的数据

$.ready(function() {
//循环初始化所有下拉刷新，上拉加载。
$.each(document.querySelectorAll('.mui-slider-group .mui-scroll'), function(index, pullRefreshEl) {
$(pullRefreshEl).pullToRefresh({
down: {
callback: function() {
var self = this;
setTimeout(function() {
var ul = self.element.querySelector('.mui-table-view');
ul.insertBefore(createFragment(ul, index, 10, true), ul.firstChild);
self.endPullDownToRefresh();
}, 1000);
}
},
up: {
callback: function() {
var self = this;
setTimeout(function() {
var ul = self.element.querySelector('.mui-table-view');
ul.appendChild(createFragment(ul, index, 5));
self.endPullUpToRefresh();
}, 1000);
}
}
});
});
var createFragment = function(ul, index, count, reverse) {
var length = ul.querySelectorAll('li').length;
var fragment = document.createDocumentFragment();
var li;
for (var i = 0; i < count; i++) {
li = document.createElement('li');
li.className = 'mui-table-view-cell';
li.innerHTML = '第' + (index + 1) + '个选项卡子项-' + (length + (reverse ? (count - i) : (i + 1)));
fragment.appendChild(li);
}
return fragment;
};