用iscroll.js滚屏到底部触发事件怎么写？

这是我之前写的一个，你可以参考看下
<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=0, minimum-scale=1.0, maximum-scale=1.0">
        <meta name="apple-mobile-web-app-capable" content="yes">
        <meta name="apple-mobile-web-app-status-bar-style" content="black">
        <title>下拉刷新</title>
        <script type="text/javascript" src="http://code.jquery.com/jquery-2.1.4.min.js"></script>
        <script type="text/javascript" src="http://cubiq.org/dropbox/iscroll4/src/iscroll.js?v4"></script>
        <style type="text/css" media="all">
            body,
            ul,
            li {
                padding: 0;
                margin: 0;
                border: 0;
            }
            body {
                font-size: 12px;
                -webkit-user-select: none;
                -webkit-text-size-adjust: none;
                font-family: helvetica;
                background: #777777;
            }
            #header {
                position: absolute;
                z-index: 2;
                top: 0;
                left: 0;
                width: 100%;
                height: 45px;
                line-height: 45px;
                background-color: #d51875;
                background-image: -webkit-gradient(linear, 0 0, 0 100%, color-stop(0, #fe96c9), color-stop(0.05, #d51875), color-stop(1, #7b0a2e));
                background-image: -moz-linear-gradient(top, #fe96c9, #d51875 5%, #7b0a2e);
                background-image: -o-linear-gradient(top, #fe96c9, #d51875 5%, #7b0a2e);
                padding: 0;
                color: #eee;
                font-size: 20px;
                text-align: center;
            }
            #header a {
                color: #f3f3f3;
                text-decoration: none;
                font-weight: bold;
                text-shadow: 0 -1px 0 rgba(0, 0, 0, 0.5);
            }
            #footer {
                position: absolute;
                z-index: 2;
                bottom: 0;
                left: 0;
                width: 100%;
                height: 48px;
                background-color: #222;
                background-image: -webkit-gradient(linear, 0 0, 0 100%, color-stop(0, #999), color-stop(0.02, #666), color-stop(1, #222));
                background-image: -moz-linear-gradient(top, #999, #666 2%, #222);
                background-image: -o-linear-gradient(top, #999, #666 2%, #222);
                padding: 0;
                border-top: 1px solid #444;
            }
            p{
                height: 20px;
                overflow: hidden;
                background: red;
            }
            #wrapper {
                position: absolute;
                z-index: 1;
                top: 45px;
                bottom: 48px;
                left: -9999px;
                width: 100%;
                background: #aaa;
                overflow: auto;
            }
            #scroller {
                position: absolute;
                z-index: 1;
                -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
                width: 100%;
                padding: 0;
            }
            #scroller ul {
                list-style: none;
                padding: 0;
                margin: 0 auto;
                width: 100%;
                text-align: left;
                width: 80px;
            }
            #scroller li {
                overflow: hidden;
                width: 80px;
                font-size: 14px;
            }
            #scroller li img {
                width: 100%;
                height: 150px;
                overflow: hidden;
                vertical-align: middle;
            }
            #myFrame {
                position: absolute;
                top: 0;
                left: 0;
            }
            #pullUp {
                background: #fff;
                height: 40px;
                line-height: 40px;
                padding: 5px 10px;
                border-bottom: 1px solid #ccc;
                font-weight: bold;
                font-size: 14px;
                color: #888;
            }
            #pullUp .pullUpIcon {
                display: block;
                float: left;
                width: 40px;
                height: 40px;
                background: url(http://cubiq.org/dropbox/iscroll4/examples/pull-to-refresh/pull-icon@2x.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);
            }
            #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);
                }
            }
            #loading {
                display: none;
                position: absolute;
                top: 180px;
                left: 150px;
                width: 26px;
                height: 8px;
                z-index: 99
            }
            #loading img {
                margin: 0 0 0 -50%
            }
        </style>

    </head>

    <body>

        <div id="header"><a href="http://cubiq.org/iscroll">iScroll</a></div>
        <div id="wrapper">
            <div id="scroller">
                <div id="loading">
                    <img src="img/loading.gif" />
                </div>
                <ul id="bookList">
                    <li>
                        <img src="http://img3.cache.netease.com/photo/0003/2015-10-16/B61JB9AK00AJ0003.jpg" />
                        <p>JavaScript高级程序设计（第3版）</p>
                    </li>
                    <li>
                        <img src="http://img4.cache.netease.com/photo/0003/2015-10-16/900x600_B61JB9IR00AJ0003.jpg" />
                        <p>JavaScript语言精粹</p>
                    </li>
                    <li>
                        <img src="http://img3.cache.netease.com/photo/0003/2015-10-16/900x600_B61JBAGS00AJ0003.jpg" />
                        <p>JavaScript DOM编程艺术</p>
                    </li>
                    <li>
                        <img src="http://img6.cache.netease.com/photo/0003/2013-10-09/900x600_9AOEKEKF00AJ0003.jpg" />
                        <p>JavaScript高级程序设计</p>
                    </li>
                    <li>
                        <img src="http://img4.cache.netease.com/photo/0003/2013-10-09/900x600_9AOEKF7E00AJ0003.jpg" />
                        <p>JavaScript 权威指南</p>
                    </li>
                    <li>
                        <img src="http://img5.cache.netease.com/photo/0003/2013-10-09/900x600_9AOEKFQA00AJ0003.jpg" />
                        <p>JavaScript 权威指南</p>
                    </li>
                    <li>
                        <img src="http://img3.cache.netease.com/photo/0003/2013-10-09/900x600_9AOEKGAF00AJ0003.jpg" />
                        <p>基于MVC的JavaScript Web富应用开发</p>
                    </li>
                    <li>
                        <img src="https://img3.doubanio.com/spic/s6245861.jpg" />
                        <p>高性能JavaScript</p>
                    </li>
                </ul>
                <div id="pullUp">
                    <span class="pullUpIcon"></span><span class="pullUpLabel">滑动加载...</span>
                </div>
            </div>
        </div>
        <div id="footer"></div>
    </body>
    <script type="text/javascript">
        var myScroll, pullUpEl, pullUpOffset;
        var opage = 1;

        function pullUpAction() {
            $(function() {
                $.ajax({
                    type: "get",
                    url: "https://api.douban.com/v2/book/search?q=javascript&alt=json&callback=fn1&start=" + (opage++) + "&count=20",
                    cache: false,
                    dataType: "jsonp",
                    jsonpCallback: "fn1",
                    success: function(data) {
                        var odata = data.books;
                        var ohtml = "";
                        for (var i = 0; i < odata.length; i++) {
                            ohtml += "<li><img src='img/07.gif' _src=" + odata[i]["images"]["small"] + "><p>" + odata[i]["title"] + "</p></li>";
                        }
                        $("#bookList").append(ohtml);
                        // src="http://p19.qhimg.com/t015e7d1233fd0f44cf.gif" _src="http://p18.qhimg.com/t01f08740a9982d6928.png"
                        //                            setTimeout(function() {
                        myScroll.refresh();
                        //                            }, 0);
                    },
                    error: function() {
                        alert("出错");
                    }
                });
            });
        }

        function loaded() {
            pullUpEl = document.getElementById('pullUp');
            pullUpOffset = pullUpEl.offsetHeight;
            myScroll = new iScroll('wrapper', {
                useTransition: true,
                onRefresh: function() {
                    if (pullUpEl.className.match('loading')) {
                        pullUpEl.className = '';
                        pullUpEl.querySelector('.pullUpLabel').innerHTML = '滑动刷新...';
                    }
                },
                onScrollMove: function() {
                    if (this.y < (this.maxScrollY - 5) && !pullUpEl.className.match('flip')) {
                        pullUpEl.className = 'flip';
                        pullUpEl.querySelector('.pullUpLabel').innerHTML = '释放刷新...';
                        this.maxScrollY = this.maxScrollY;
                    }
                    
                },
                onScrollEnd: function() {
                    if (pullUpEl.className.match('flip')) {
                        if (opage === 3) {
                            pullUpEl.className = 'flip';
                            pullUpEl.querySelector('.pullUpLabel').innerHTML = '没有更多数据了...';
                        } else {
                            pullUpEl.className = 'loading';
                            pullUpEl.querySelector('.pullUpLabel').innerHTML = '加载中...';
                            pullUpAction();
                        }
                    }
                }
            });
            setTimeout(function() {
                document.getElementById('wrapper').style.left = '0';
            }, 800);
        }
        document.addEventListener('touchmove', function(e) {
            e.preventDefault();
        }, false);
        document.addEventListener('DOMContentLoaded', function() {
            setTimeout(loaded, 200);
        }, false);


    </script>
        <script src="http://s0.qhimg.com/lib/jquery/183.js"></script>
        <script src="http://zsall.mobilem.360.cn/stc_mebook/js/jquery.mobile.custom.js"></script>
        <script type="text/javascript" src="http://s4.qhimg.com/static/ed81309f1c18ce0f.js"></script>

</html>
用iscroll.js滚屏到底部触发事件怎么写？

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