sp_get_menu函数使用分析

function sp_get_menu($id="main",$effected_id="mainmenu",$filetpl="<span class=‘file‘>\$label</span>",$foldertpl="<span class=‘folder‘>\$label</span>",$ul_class="" ,$li_class="" ,$style="filetree",$showlevel=6,$dropdown=‘hasChild‘){
	$navs=F("site_nav_".$id);
	if(empty($navs)){
		$navs=_sp_get_menu_datas($id);
	}

	import("Tree");
	$tree = new \Tree();
	$tree->init($navs);
	// var_dump($navs);
	return $tree->get_treeview_menu($id,$effected_id, $filetpl, $foldertpl,  $showlevel,$ul_class,$li_class,  $style,  1, FALSE, $dropdown);
}