1.在page_header.lbi对应的位置（你想显示导航的位置）插入

  (注意下面的"themes/模板名称/util.php"中的"模板名称"改成你模板文件夹的名称)

1. <?php 
2.     require_once("themes/模板名称/util.php"); 
3. ?> 
4. <div class="header-menu">  
5.              <p {if $navigator_list.config.index eq 1} class="cur" {/if}><a href=http://www.mamicode.com/"../index.php">{$lang.home}</a></p>   
6.                 <ul>                   
7.                   <!-- {foreach name=nav_middle_list from=$navigator_list.middle item=nav} --> 
8.                    <li onMouseOver="sw_nav(this,1);" onMouseOut="sw_nav(this,0);" {if $nav.active eq 1} class="curs"{/if}> 
9.                    <a href=http://www.mamicode.com/"{$nav.url}" {if $nav.opennew eq 1}target="_blank" {/if}>{$nav.name}</a> 
10.                   <?php  
11.                                   $subcates = get_subcate_byurl($GLOBALS[‘smarty‘]->_var[‘nav‘][‘url‘]); 
12.                              if($subcates!=false) 
13.                         { 
14.                                 if(count($subcates)>0) 
15.                             { 
16.                                     echo "<div class=‘sub_nav‘>"; 
17.                                  
18.                                 if($subcates) 
19.                                 { 
20.                                 foreach($subcates as $cate) 
21.                                 { 
22.                                         echo "<a href=http://www.mamicode.com/‘".$cate[‘url‘]."‘ class=‘level_1‘>".$cate[‘name‘]."</a>"; 
23.                                     
24.                                 } 
25.                                 }                                 
26.                                 echo "</div><iframe frameborder=‘0‘ scrolling=‘no‘ class=‘nomask‘></iframe>"; 
27.                             } 
28.                         } 
29.                              ?> 
30.                    </li> 
31.                  <!-- {/foreach} --> 
32.             </ul> 
33.       <script type="text/javascript"> 
34.       //初始化主菜单 
35.                 function sw_nav(obj,tag) 
36.                 { 
37.  
38.                         var subdivs = obj.getElementsByTagName("DIV"); 
39.                         var ifs = obj.getElementsByTagName("IFRAME"); 
40.                          
41.                         if(subdivs.length>0) 
42.                         { 
43.  
44.                                 if(tag==1) 
45.                                 { 
46.                                         subdivs[0].style.display = "block"; 
47.                                         ifs[0].style.display = "block"; 
48.                                 } 
49.                                 else 
50.                                 { 
51.                                         subdivs[0].style.display = "none";         
52.                                         ifs[0].style.display = "none"; 
53.                                 } 
54.                                  
55.                         } 
56.                 } 
57.  
58.       </script>  
59. </div> 

2.在CSS文件中插入

1. .header-menu p{ float:left;padding:1px 12px 1px 0;margin-top:-2px;} 
2. .header-menu  ul li{float:left;padding:1px 12px 1px 12px;margin-top:-2px;} 
3. .header-menu ul li a,.header-menu p a{color: #333;display:block;} 
4. .header-menu ul li a:hover,.header-menu p a:hover{color:#888;} 
5. .header-menu ul li.curs{background:#999;} 
6. .header-menu ul li.curs a{color:#fff;} 
7.  
8. .sub_nav{ background:#999;width:110px; position:absolute; z-index:5003; display:none;margin-left:-12px;} 
9. .nomask{ background:#fff; width:110px; height:50px; position:absolute; z-index:5002;display:none;margin-left:-12px;} 
10. .sub_nav a.level_1{ display:block;color:#fff;padding:6px 6px 6px 13px;font:11px Tahoma,Verdana,PMingLiU,Arial;border-bottom:1px dotted #D1D1D1;*border-bottom:1px dotted #D1D1D1 !important;*border-bottom:1px solid #A8A8A8;} 
11. .sub_nav a.level_1:hover{color:#fff;background:#55B46C;text-decoration:none;} 

3.把以下代码编辑成(util.php)解压出来拷贝到模板目录下

1.  <?php 
2. /** 
3.  * 通过传入参数的url判断是否为目录分类，从而获取子菜单 
4.  * 
5.  * @param string $url 
6.  */ 
7. function get_subcate_byurl($url) 
8. { 
9.     $rs = strpos($url,"category"); 
10.     if($rs!==false) 
11.     { 
12.         preg_match("/\d+/i",$url,$matches); 
13.         $cid = $matches[0]; 
14.         $cat_arr = array(); 
15.         $sql = "select * from ".$GLOBALS[‘ecs‘]->table(‘category‘)." where parent_id=".$cid." and is_show=1"; 
16.         $res = $GLOBALS[‘db‘]->getAll($sql); 
17.          
18.         foreach($res as $idx => $row) 
19.         { 
20.             $cat_arr[$idx][‘id‘]   = $row[‘cat_id‘]; 
21.             $cat_arr[$idx][‘name‘] = $row[‘cat_name‘]; 
22.             $cat_arr[$idx][‘url‘]  = build_uri(‘category‘, array(‘cid‘ => $row[‘cat_id‘]), $row[‘cat_name‘]); 
23.             $cat_arr[$idx][‘children‘] = get_clild_list($row[‘cat_id‘]); 
24.         } 
25.  
26.         return $cat_arr; 
27.     } 
28.     else  
29.     { 
30.         return false; 
31.     } 
32. } 
33.  
34. function get_clild_list($pid) 
35. { 
36.    //开始获取子分类 
37.     $sql_sub = "select * from ".$GLOBALS[‘ecs‘]->table(‘category‘)." where parent_id=".$pid." and is_show=1"; 
38.  
39.     $subres = $GLOBALS[‘db‘]->getAll($sql_sub); 
40.     if($subres) 
41.     { 
42.         foreach ($subres as $sidx => $subrow) 
43.         { 
44.             $children[$sidx][‘id‘]=$subrow[‘cat_id‘]; 
45.             $children[$sidx][‘name‘]=$subrow[‘cat_name‘]; 
46.             $children[$sidx][‘url‘]=build_uri(‘category‘, array(‘cid‘ => $subrow[‘cat_id‘]), $subrow[‘cat_name‘]); 
47.         } 
48.     } 
49.     else  
50.     { 
51.         $children = null; 
52.     } 
53.              
54.     return $children; 
55. } 
56.  
57. ?> 

ecshop简单三部实现导航分类二级菜单