不考虑加个在线人数统计功能吗？

<?php
$pw_tmsgs = GetTtable($id);
    $rt = $db->get_one("SELECT t.tid,t.subject,tm.content,tm.ifconvert FROM pw_threads t LEFT JOIN $pw_tmsgs tm ON tm.tid=t.tid  WHERE t.tid=".S::sqlEscape($id));
    $rt['content'] = str_replace("\n","<br>",$rt['content']);
    //* include_once pwCache::getPath(D_P.'data/bbscache/wordsfb.php');
    pwCache::getData(D_P.'data/bbscache/wordsfb.php');
    foreach ($alarm as $key => $value) {
        $rt['content'] = str_replace($key,'<span style="background-color:#ffff66">'.$key.'</span>',$rt['content']);
    }

<script>
            $.ajax({
                url:"ajax.php",
                type:"post",
                success:function(result,state)
                {
                    alert(state);
                },
                complete:function(XMLHttpRequest,textstatus)
                {
                    alert('请求状态是:'+textstatus);
                },
                timeout:3000,
                error:function(XMLHttpRequest, textStatus, errorThrown)
                {
                    alert('出错,状态是：'+textStatus);
                }
            });
        </script>

发段脚本玩玩