搞了好几个小时 还是搞不定这个 在firefox中用一个user.js使用ajax提交服务器
服务器返回内容

<?xml version="1.0" encoding="gbk"?>
<root><![CDATA[<h3 class="flb">
<em id="return_reply">
参与/回复主题</em>
<span>
<a href="javascript:;" class="flbc" onclick="hideWindow('reply')" title="关闭">关闭</a>
</span>
</h3>

<form method="post" autocomplete="off" id="postform" action="forum.php?mod=post&amp;infloat=yes&amp;action=reply&amp;fid=6&amp;extra=page%3D1&amp;tid=1452788&amp;replysubmit=yes" onsubmit="this.message.value = parseurl(this.message.value);ajaxpost('postform', 'return_reply', 'return_reply', 'onerror');return false;">
<div class="c" id="floatlayout_reply">
<div class="p_c">
<input type="hidden" name="formhash" id="formhash" value="c6233642" />
<input type="hidden" name="handlekey" value="reply" />
<input type="hidden" name="noticeauthor" value="3508dW5XUU/a5kw0cYoy6G8socGi9WgWDO8uUC71sIbz41BT1w" />
<input type="hidden" name="noticetrimstr" value="" />
<input type="hidden" name="noticeauthormsg" value="不管怎么样.member这页必须要ssl保护
用户们的密码安全很重要
5年的ssl证书才155 RMB


http://is.gd/ ..." />
<input type="hidden" name="reppid" value="27434874" />
<input type="hidden" name="reppost" value="27434874" />
<div class="pbt cl">
<span id="subjecthide" class="z">RE: 希望卡饭买个ssl证书 [<a href="javascript:;" onclick="display('subjecthide');display('subjectbox');$('subject').value='RE: 希望卡饭买个ssl证书'">修改</a>]</span>
<span id="subjectbox" style="display:none"><input name="subject" id="subject" class="px" value="" tabindex="21" style="width: 25em" /></span>
</div>

<div class="tedt">
<div class="bar">
<span class="y">
<a href="http://bbs. onclick="switchAdvanceMode(this.href);doane(event);">高级模式</a>
</span><script src="data/cache/seditor.js?IBO" type="text/javascript"></script>
<div class="fpd">
<a href="javascript:;" title="文字加粗" class="fbld" onclick="seditor_insertunit('post', '', '');doane(event);">B</a>
<a href="javascript:;" title="设置文字颜色" class="fclr" id="postforecolor" onclick="showColorBox(this.id, 2, 'post');doane(event);">Color</a>
<a id="postimg" href="javascript:;" title="图片" class="fmg" onclick="seditor_menu('post', 'img');doane(event);">Image</a>
<a id="posturl" href="javascript:;" title="添加链接" class="flnk" onclick="seditor_menu('post', 'url');doane(event);">Link</a>
<a id="postquote" href="javascript:;" title="引用" class="fqt" onclick="seditor_menu('post', 'quote');doane(event);">Quote</a>
<a id="postcode" href="javascript:;" title="代码" class="fcd" onclick="seditor_menu('post', 'code');doane(event);">Code</a>
<a href="javascript:;" class="fsml" id="postsml" onclick="showMenu({'ctrlid':this.id,'evt':'click','layer':2});return false;">Smilies</a>
<script type="text/javascript" reload="1">smilies_show('postsmiliesdiv', 8, 'post');</script>
</div></div>
<div class="area">
<textarea rows="7" cols="80" name="message" id="postmessage" onKeyDown="seditor_ctlent(event, '$(\'postsubmit\').click();')" tabindex="22" class="pt"></textarea>
</div>
</div>
</div>
</div>
<div class="o pns" id="moreconf">
<button type="submit" id="postsubmit" class="pn pnc z" value="true" name="replysubmit" tabindex="23"><span>参与/回复主题</span></button>
</div>
</form>

<script type="text/javascript" reload="1">
function succeedhandle_reply(locationhref, message) {
try {
var pid = locationhref.lastIndexOf('#pid');
if(pid != -1) {
pid = locationhref.substr(pid + 4);
ajaxget('forum.php?mod=viewthread&tid=1452788&viewpid=' + pid, 'post_new', 'ajaxwaitid', '', null, 'appendreply()');
if(replyreload) {
var reloadpids = replyreload.split(',');
for(i = 1;i < reloadpids.length;i++) {
ajaxget('forum.php?mod=viewthread&tid=1452788&viewpid=' + reloadpids[i], 'post_' + reloadpids[i]);
}
}
} else {
showDialog(message, 'notice', '', 'location.href="' + locationhref + '"');
}
} catch(e) {
location.href = locationhref;
}
hideWindow('reply');
}

if($('subjectbox')) {
$('postmessage').focus();
} else if($('subject')) {
$('subject').select();
$('subject').focus();
}
</script>]]></root>

怎么才能获取到<input type="hidden" name="noticeauthor" value="3508dW5XUU/a5kw0cYoy6G8socGi9WgWDO8uUC71sIbz41BT1w" />中的value呢？

ajax回调函数：

sendAsynchronRequest(src.getAttribute("action_url"),null,function(){
                        try{
                            if (mykafanxmlHttp.readyState == 4) {
                                if (mykafanxmlHttp.status == 200) {
                                    if(mykafanxmlHttp.responseText != null && mykafanxmlHttp.responseText != ""){ 

                                        var root = mykafanxmlHttp.responseXML;
                                        root=root.getElementsByTagName("root")[0];
                                        //var aaa=root;
                                        alert(root);
                                   }
                                }
                            }
                          }catch(e){
                              alert(e);
                          }
                    });

好像因为CDATA的关系 我取不到里面的input了，要怎么才能解决这个？

搞清楚CDATA的意义问题就解决了

根据xml对CDATA解析的规定，CDATA包含的数据不由xml规则解析，当然你就不能由xml机制来获取节点啦
处理办法：
1.把需要解析的数据放置在CDATA标签外
2.利用其它替代数据传输方案，例如json进行数据标示与传输