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一级栏目本栏目下出现子目录 if($GLOBALS[navclasid]==3) { UL /UL }elseif($GLOBALS[navclasid]==4) { UL /UL}else{ }二级栏目本栏目下出现子目录 if($clas_r[$GLOBALS[navclasid]][bclasid]==3) { UL