请问下，同段的js为什么在pc端正常，移动端就不行了？

html调用代码：

<div id="pgbtn" class="pgbtn_page">
      <a class="page_a" href="javascript:;" rel="forum.php?order={$_GET['order']}&page=$ntpage" curpage="{$_G['page']}" id="autopbn" totalpage="{$fynum}" picstyle="$_G[forum][picstyle]" forumdefstyle="$_G[cookie][forumdefstyle]">点击加载更多</a>
      <script type="text/javascript" src="{$_G[style][styleimgdir]}/js/exauto_ajax_page.js?{VERHASH}"></script>
    </div>

js文件代码：

(function() {

    var autopbn = $('autopbn');
    var nextpageurl = autopbn.getAttribute('rel').valueOf();
    var curpage = parseInt(autopbn.getAttribute('curpage').valueOf());
    var totalpage = parseInt(autopbn.getAttribute('totalpage').valueOf());
    var picstyle = parseInt(autopbn.getAttribute('picstyle').valueOf());
    var forumdefstyle = parseInt(autopbn.getAttribute('forumdefstyle').valueOf());
    picstyle = picstyle && !forumdefstyle;
    var autopagenum = 0;
    var maxpage = (curpage + autopagenum) > totalpage ? totalpage : (curpage + autopagenum);

    var loadstatus = 0;

    autopbn.onclick = function() {
        var oldloadstatus = loadstatus;
        loadstatus = 2;
        autopbn.innerHTML = '正在加载, 请稍后...';
        getnextpagecontent();
        loadstatus = oldloadstatus;
    };

    if(autopagenum > 0) {
        window.onscroll = function () {
            var curtop = Math.max(document.documentElement.scrollTop, document.body.scrollTop);
            if(curtop + document.documentElement.clientHeight + 500 >= document.documentElement.scrollHeight && !loadstatus) {
                loadstatus = 1;
                autopbn.innerHTML = '正在加载, 请稍后...';
                setTimeout(getnextpagecontent, 1000);
            }
        };
    }

    function getnextpagecontent() {

        if(curpage + 1 > totalpage) {
            window.onscroll = null;
            autopbn.innerHTML = '没有更多了...';
            return;
        }
        if(loadstatus != 2 && curpage + 1 > maxpage) {
            autopbn.innerHTML = '点击加载更多';
            if(curpage + 1 > maxpage) {
                window.onscroll = null;
            }
            return;
        }
        curpage++;
        var url = nextpageurl + '&t=' + parseInt((+new Date()/1000)/(Math.random()*1000));
        var x = new Ajax('HTML');
        x.get(url, function (s) {
            s = s.replace(/\n|\r/g, '');
            if(s.indexOf("id=\"autopbn\"") == -1) {
                $("autopbn").innerHTML = '没有更多了...';
                window.onscroll = null;
            }

            if(!picstyle) {
                var tableobj = $('thread-list');
                var nexts = s.match(/\<article id="normalthread_(\d+)" class="topic-visited"\>(.+?)\<\/article>/g);
                for(i in nexts) {
                    if(i == 'index' || i == 'lastIndex') {
                        continue;
                    }
                    var insertid = nexts[i].match(/<article id="normalthread_(\d+)" class="topic-visited"\>/);
                    if(!$('normalthread_' + insertid[1])) {

                        var newbody = document.createElement('article');
                        tableobj.appendChild(newbody);
                        var div = document.createElement('div');
                        div.innerHTML = '<div>' + nexts[i] + '</div>';
                        tableobj.replaceChild(div.childNodes[0].childNodes[0], tableobj.lastChild);
                    }
                }
            } else {
                var nexts = s.match(/\<li style="width:\d+px;" id="picstylethread_(\d+)"\>(.+?)\<\/li\>/g);
                for(i in nexts) {
                    var insertid = nexts[i].match(/id="picstylethread_(\d+)"\>/);
                    if(!$('picstylethread_' + insertid[1])) {
                        $('threadlist_picstyle').innerHTML += nexts[i];
                    }
                }
            }
            var pageinfo = s.match(/\<div id="fd_page_bottom" class="panel-footer clearfix"\>(.+?)\<\/div\>/);
            nextpageurl = nextpageurl.replace(/&page=\d+/, '&page=' + (curpage + 1));

            $('fd_page_bottom').innerHTML = pageinfo[1];
            if(curpage + 1 > totalpage) {
                autopbn.innerHTML = '没有更多了...';
            } else {
                autopbn.innerHTML = '点击加载更多';
            }
            loadstatus = 0;
        });
    }

})();