基于iSroll插件实现html5页面上拉加载更多

先引入iscroll.js文件

页面滑动部分的html结构如下：

<div id="wrapper" style="overflow: hidden; left: 0px;">
<div id="scroller">
<div id="pullDown">
<span class="pullDownIcon"></span><span class="pullDownLabel">下拉刷新...</span>
</div>
<ul id="thelist">
<li>Pretty row 1</li>
<li>Pretty row 2</li>
...
</ul>
<div id="pullUp">
<span class="pullUpIcon"></span><span class="pullUpLabel">上拉加载更多...</span>
</div>
</div>
</div>

在页面加载完成时定义iscroll的滑动事件：

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

function pullDownAction () {
$.ajax({
url:"刷新的ajax请求",
type:"POST",
success:function(json){
//使用ajax请求刷新列表数据，这块肯定得自己写
...
myScroll.refresh();//刷新滑动区域
}
});
}

function pullUpAction () {
$.ajax({
url:"加载更多的ajax请求",
type:"POST",
success:function(json){
//使用ajax请求返回的数据追加到列表后面，这块肯定得自己写
...
myScroll.refresh();//刷新滑动区域
}
});
}

function loaded() {
pullDownEl = document.getElementById('pullDown');
pullDownOffset = pullDownEl.offsetHeight;
pullUpEl = document.getElementById('pullUp');
pullUpOffset = pullUpEl.offsetHeight;

myScroll = new iScroll('wrapper', {
useTransition: true,
topOffset: pullDownOffset,
onRefresh: function () {//myScroll刷新时触发
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 () {//上下滑动时触发
if (this.y > 5 && !pullDownEl.className.match('flip')) {
pullDownEl.className = 'flip';
pullDownEl.querySelector('.pullDownLabel').innerHTML = '释放立即加载...';
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 = '释放立即加载...';
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 () {//上下滑到底部时触发
if (pullDownEl.className.match('flip')) {
pullDownEl.className = 'loading';
pullDownEl.querySelector('.pullDownLabel').innerHTML = '加载中...';
pullDownAction();//在这里定义下拉时的行为
} else if (pullUpEl.className.match('flip')) {
pullUpEl.className = 'loading';
pullUpEl.querySelector('.pullUpLabel').innerHTML = '加载中...';
pullUpAction();//在这里定义上拉时的行为
}
}
});
}

document.addEventListener('touchmove', function (e) { e.preventDefault(); }, false);

window.addEventListener('load', function () { setTimeout(loaded, 200); }, false);

当然不能忘了相关的样式，下面可供参考：

/**
*
* scroll styles
*
*/
#pullDown, #pullUp {
background:#fff;
height:40px;
line-height:40px;
padding:5px 10px;
border-bottom:1px solid #ccc;
font-weight:bold;
font-size:14px;
color:#888;
}
#pullDown .pullDownIcon, #pullUp .pullUpIcon  {
display:block; float:left;
width:40px; height:40px;
background:url(../app/pull-icon.png) 0 0 no-repeat;
-webkit-background-size:40px 80px; background-size:40px 80px;
-webkit-transition-property:-webkit-transform;
-webkit-transition-duration:250ms;
}
#pullDown .pullDownIcon {
-webkit-transform:rotate(0deg) translateZ(0);
}
#pullUp .pullUpIcon  {
-webkit-transform:rotate(-180deg) translateZ(0);
}

#pullDown.flip .pullDownIcon {
-webkit-transform:rotate(-180deg) translateZ(0);
}

#pullUp.flip .pullUpIcon {
-webkit-transform:rotate(0deg) translateZ(0);
}

#pullDown.loading .pullDownIcon, #pullUp.loading .pullUpIcon {
background-position:0 100%;
-webkit-transform:rotate(0deg) translateZ(0);
-webkit-transition-duration:0ms;
-webkit-animation-name:loading;
-webkit-animation-duration:2s;
-webkit-animation-iteration-count:infinite;
-webkit-animation-timing-function:linear;
}

@-webkit-keyframes loading {
from { -webkit-transform:rotate(0deg) translateZ(0); }
to { -webkit-transform:rotate(360deg) translateZ(0); }
}

参考上述几步，只需自定义pullDownAction、pullUpAction两个函数，便可实现html5页面的上、下拉事件（附上样式中的pull-icon.png图片）