jQuery模拟原生态App上拉刷新下拉加载更多页面及原理

<div id="wrapper"> <ul>  <li>row </li>  <li>row </li>  <li>row </li>  <li>row </li>  <li>row </li>  <li>row </li>  <li>row </li>  <li>row </li>  <li>row </li>  <li>row </li> </ul> </div> <script> for (var i = ; i < document.querySelectorAll("#wrapper ul li").length; i++) {  document.querySelectorAll("#wrapper ul li")[i].colorfulBg(); } refresher.init({  id: "wrapper",//<------------------------------------------------------------------------------------┐  pullDownAction: Refresh,  pullUpAction: Load }); var generatedCount = ; function Refresh() {  setTimeout(function () { // <-- Simulate network congestion, remove setTimeout from production!  var el, li, i;  el = document.querySelector("#wrapper ul");  el.innerHTML = '';  for (i = ; i < ; i++) {   li = document.createElement('li');   li.appendChild(document.createTextNode('async row ' + (++generatedCount)));   el.insertBefore(li, el.childNodes[]);  }  wrapper.refresh();/****remember to refresh after action completed！ ---yourId.refresh(); ----| ****/  for (var i = ; i < document.querySelectorAll("#wrapper ul li").length; i++) {   document.querySelectorAll("#wrapper ul li")[i].colorfulBg();  }  }, ); } function Load() {  setTimeout(function () {// <-- Simulate network congestion, remove setTimeout from production!  var el, li, i;  el = document.querySelector("#wrapper ul");  for (i = ; i < ; i++) {   li = document.createElement('li');   li.appendChild(document.createTextNode('async row ' + (++generatedCount)));   el.appendChild(li, el.childNodes[]);  }  wrapper.refresh();/****remember to refresh after action completed！！！ ---id.refresh(); --- ****/  for (var i = ; i < document.querySelectorAll("#wrapper ul li").length; i++) {   document.querySelectorAll("#wrapper ul li")[i].colorfulBg();  }  }, ); } </script>

// 下拉刷新的原理 - (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView {  if (scrollView.contentOffset.y < - 100) {    [UIView animateWithDuration:1.0 animations:^{     // frame发生偏移,距离顶部150的距离(可自行设定)   self.tableView.contentInset = UIEdgeInsetsMake(150.0f, 0.0f, 0.0f, 0.0f);  } completion:^(BOOL finished) {     /**   * 发起网络请求,请求刷新数据   */   }];  } } // 上拉加载的原理 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {  NSLog(@"%f",scrollView.contentOffset.y);  NSLog(@"%f",scrollView.frame.size.height);  NSLog(@"%f",scrollView.contentSize.height);  /**  * 关键-->  * scrollView一开始并不存在偏移量,但是会设定contentSize的大小,所以contentSize.height永远都会比contentOffset.y高一个手机屏幕的  * 高度;上拉加载的效果就是每次滑动到底部时,再往上拉的时候请求更多,那个时候产生的偏移量,就能让contentOffset.y + 手机屏幕尺寸高大于这  * 个滚动视图的contentSize.height  */  if (scrollView.contentOffset.y + scrollView.frame.size.height >= scrollView.contentSize.height) {  NSLog(@"%d %s",__LINE__,__FUNCTION__);  [UIView commitAnimations];  [UIView animateWithDuration:1.0 animations:^{   // frame发生的偏移量,距离底部往上提高60(可自行设定)   self.tableView.contentInset = UIEdgeInsetsMake(0, 0, 60, 0);  } completion:^(BOOL finished) {   /**   * 发起网络请求,请求加载更多数据   * 然后在数据请求回来的时候,将contentInset改为(0,0,0,0)   */  }];  } }