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<ul id="nav" class="fr">

<li class="n1 now on">

<a href="{SITE_URL}">首頁</a>

</li>

<li class="n6 ">

<a href="javascript:void(0);">關(guān)于文旅</a>

<ul class="subnav" style="display: none;">

<li><a href="{SITE_URL}index.php?c=page&id=1">文旅簡介</a></li>

<li><a href="{SITE_URL}index.php?c=page&id=2">組織架構(gòu)</a></li>

<li><a href="{SITE_URL}index.php?c=page&id=3">下屬子公司</a></li>

<li><a href="{SITE_URL}index.php?c=page&id=4">大事展示</a></li>

<li><a href="{SITE_URL}index.php?c=page&id=5">企業(yè)榮譽(yù)</a></li>

</ul>

</li>

<li class="n7 ">

<a href="{SITE_URL}index.php?s=boss&c=category&id=1">領(lǐng)導(dǎo)分工</a>

</li>

<li class="n8">

<a href="{SITE_URL}index.php?s=news&c=category&id=1">新聞動(dòng)態(tài)</a>

</li>

<li class="n9 ">

<a href="javascript:void(0);">黨群工作</a>

<ul class="subnav" style="display: none;">

<li><a href="{SITE_URL}index.php?s=party&c=category&id=2">黨的建設(shè)</a></li>

<li><a href="{SITE_URL}index.php?s=party&c=category&id=3">群團(tuán)工作</a></li>

</ul>

</li>

<li class="n11">

<a href="javascript:void(0);">文旅項(xiàng)目</a>

<ul class="subnav" style="display: none;">

<li class="n22"> <a href="{SITE_URL}index.php?s=case&c=category&id=5">旅游經(jīng)營</a> </li>

<li class="n21"> <a href="{SITE_URL}index.php?s=case&c=category&id=4">文創(chuàng)綜合體</a> </li>

<li class="n20"> <a href="{SITE_URL}index.php?s=case&c=category&id=3">主題景區(qū)</a> </li>

<li class="n17"> <a href="{SITE_URL}index.php?s=case&c=category&id=2">古街古鎮(zhèn)</a> </li>

</ul>

</li>

<li class="n12 ">

<a href="{SITE_URL}index.php?s=zhidu&c=category&id=1">制度建設(shè)</a>

</li>

</ul>

導(dǎo)航欄是這樣的 怎么判斷當(dāng)前頁在什么位置然后在class里加now on呢？