基于HTML5上使用iScroll实现下拉刷新，上拉加载更多

var  myScroll,
 pullDownEl, pullDownOffset,
 pullUpEl, pullUpOffset,
 generatedCount = 0;

/**
 * 下拉刷新 （自定义实现此方法）
 * myScroll.refresh(); 数据加载完成后，调用界面更新方法
 */
function pullDownAction () {
 setTimeout(function () { 
 var el, li, i;
 el = document.getElementById('thelist');

 for (i=0; i<3; i++) {
 li = document.createElement('li');
 li.innerText = 'Generated row ' + (++generatedCount);
 el.insertBefore(li, el.childNodes[0]);
 }
 
 myScroll.refresh(); //数据加载完成后，调用界面更新方法 
 }, 1000); 
}

/**
 * 滚动翻页 （自定义实现此方法）
 * myScroll.refresh(); // 数据加载完成后，调用界面更新方法
 */
function pullUpAction () {
 setTimeout(function () { // <-- Simulate network congestion, remove setTimeout from production!
 var el, li, i;
 el = document.getElementById('thelist');

 for (i=0; i<3; i++) {
 li = document.createElement('li');
 li.innerText = 'Generated row ' + (++generatedCount);
 el.appendChild(li, el.childNodes[0]);
 }
 
 myScroll.refresh(); //数据加载完成后，调用界面更新方法 
 }, 1000); 
}

/**
 * 初始化iScroll控件
 */
function loaded() {
 pullDownEl = document.getElementById('pullDown');
 pullDownOffset = pullDownEl.offsetHeight;
 pullUpEl = document.getElementById('pullUp'); 
 pullUpOffset = pullUpEl.offsetHeight;
 
 myScroll = new iScroll('wrapper', {
 scrollbarClass: 'myScrollbar', 
 useTransition: false, 
 topOffset: pullDownOffset,
 onRefresh: function () {
 if (pullDownEl.className.match('loading')) {
 pullDownEl.className = '';
 pullDownEl.querySelector('.pullDownLabel').innerHTML = '下拉刷新...';
 } else if (pullUpEl.className.match('loading')) {
 pullUpEl.className = '';
 pullUpEl.querySelector('.pullUpLabel').innerHTML = '上拉加载更多...';
 }
 },
 onScrollMove: function () {
 if (this.y > 5 && !pullDownEl.className.match('flip')) {
 pullDownEl.className = 'flip';
 pullDownEl.querySelector('.pullDownLabel').innerHTML = '松手开始更新...';
 this.minScrollY = 0;
 } else if (this.y < 5 && pullDownEl.className.match('flip')) {
 pullDownEl.className = '';
 pullDownEl.querySelector('.pullDownLabel').innerHTML = '下拉刷新...';
 this.minScrollY = -pullDownOffset;
 } else if (this.y < (this.maxScrollY - 5) && !pullUpEl.className.match('flip')) {
 pullUpEl.className = 'flip';
 pullUpEl.querySelector('.pullUpLabel').innerHTML = '松手开始更新...';
 this.maxScrollY = this.maxScrollY;
 } else if (this.y > (this.maxScrollY + 5) && pullUpEl.className.match('flip')) {
 pullUpEl.className = '';
 pullUpEl.querySelector('.pullUpLabel').innerHTML = '上拉加载更多...';
 this.maxScrollY = pullUpOffset;
 }
 },
 onScrollEnd: function () {
 if (pullDownEl.className.match('flip')) {
 pullDownEl.className = 'loading';
 pullDownEl.querySelector('.pullDownLabel').innerHTML = '加载中...'; 
 pullDownAction(); // ajax call
 } else if (pullUpEl.className.match('flip')) {
 pullUpEl.className = 'loading';
 pullUpEl.querySelector('.pullUpLabel').innerHTML = '加载中...'; 
 pullUpAction(); // ajax call
 }
 }
 });
 
 setTimeout(function () { document.getElementById('wrapper').style.left = '0'; }, 800);
}

//初始化绑定iScroll控件 
document.addEventListener('touchmove', function (e) { e.preventDefault(); }, false);
document.addEventListener('DOMContentLoaded', loaded, false);