帝国Cms怎么实现调用网站一级栏目和二级栏目做为网站导航

修改头文件，具体代码如下

<nav class="nav">
<ul class="nav__menu">
<li class="nav__menu-item"><a href="[!--news.url--]" target="_self">首页</a></li>
<?php
$ecms_bq_sql=sys_ReturnEcmsLoopBq('select classid,classname,classpath from [!db.pre!]enewsclass where bclassid=0 and showclass=0 order by myorder limit 8',20,24,0); $bqno=0;
while($bqr=$empire->fetch($ecms_bq_sql))
{
$bqsr=sys_ReturnEcmsLoopStext($bqr);
$bqno++;
if($bqr[classid] != '23' ){
?>

<li class="nav__menu-item"><a href="<?=$public_r[newsurl]?><?=$bqr[classpath]?>" title="<?=$bqr[classname]?>" target="_self" ><?=$bqr[classname]?></a>
<ul class="nav__submenu">
<?php
$ecms_bq_sql2=sys_ReturnEcmsLoopBq("select classid,classname,classpath from [!db.pre!]enewsclass where bclassid='$bqr[classid]' order by myorder limit 5",20,24,0);
$bqno2=0;
while($bqr2=$empire->fetch($ecms_bq_sql2))
{
$bqsr2=sys_ReturnEcmsLoopStext($bqr2);
$bqno2++;
?>
<li class="nav__submenu-item"><a href="<?=$public_r[newsurl]?><?=$bqr2[classpath]?>" title="<?=$bqr2[classname]?>" target="_self" ><?=$bqr2[classname]?></a></li>
<?php
}
?>
</ul>
</li>

<?php
}
}
?>
</ul>
</nav>