本次升级涉及到部分默认主题的修改，因此影响到第三方主题的使用，故出此文档，以期让第三方的主题能够方便地升级到2.7.2.

修改1.

源码文件：\Application\Common\View\default\Public\header.html

我们将header中部分不经常会被改动到的内容提取到了_system.html中。所以第三方主题需要移除该被替换部分，换成引入_system文件。

<div id="nav_bar">   …… </div> 
<include file="Public/_system"/>

修改2.

源码文件：\Application\Common\View\default\Public\header.html

我们在header中加入了对是否开启系统聊天的开关，此处需找到如下代码

<li>                             <if condition="is_login()">                                 <a class="" onclick="talker.show()"><i> </i>                                     <i id="friend_has_new"                                     <php>                                         $map_mid=is_login();                                         $modelTP=D('talk_push');                                         $has_talk_push=$modelTP->where("(uid = ".$map_mid." and status = 1) or (uid =                                         ".$map_mid." and status =                                         0)")->count();                                         $has_message_push=D('talk_message_push')->where("uid= ".$map_mid." and (status=1 or                                         status=0)")->count();                                         if($has_talk_push || $has_message_push){                                     </php>                                     style="display: inline-block"                                     <php>}</php>                                     ></i>                                 </a>                                 <else/>                                 <a onclick="toast.error({:L('_PANEL_LIMIT_')})"> <i> </i>                                 </a>                             </if>                         </li>

在此代码的外框加上if，判断OPEN_IM这个参数是否为1

<if condition="modC('OPEN_IM',1,'Config')"> </if>

得到结果为

<if condition="modC('OPEN_IM',1,'Config')">                         <li>                             <if condition="is_login()">                                 <a class="" onclick="talker.show()"><i> </i>                                     <i id="friend_has_new"                                     <php>                                         $map_mid=is_login();                                         $modelTP=D('talk_push');                                         $has_talk_push=$modelTP->where("(uid = ".$map_mid." and status = 1) or (uid =                                         ".$map_mid." and status =                                         0)")->count();                                         $has_message_push=D('talk_message_push')->where("uid= ".$map_mid." and (status=1 or                                         status=0)")->count();                                         if($has_talk_push || $has_message_push){                                     </php>                                     style="display: inline-block"                                     <php>}</php>                                     ></i>                                 </a>                                 <else/>                                 <a onclick="toast.error({:L('_PANEL_LIMIT_')})"> <i> </i>                                 </a>                             </if>                         </li> </if>

修改3.

源码文件：\Public\css\core.less

我们将core.less中的一些公共less提取并分离开来，得到如下的目录结构

分离出来的less文件被我们使用import.less进行了统一引入。特别是tool.less(右下角回到顶部的less)，adv.less(广告位管理的less)，如果您的主题复写了core.css，那么建议通过引用impot.less来统一引入这些less。然后重新生成一次css文件。

代码如下

@import '../../../../Public/css/import.less';

成功兼容则会在右下角出现

如果只是一个框的话，也问题不大，因为路径问题，放到网站根目录即可正常显示。

如果看了本文还有不理解的地方，欢迎跟帖。