dede官方提供的聯動類別不能新增二級聯動。在dedecmsV5.7中新增一二級分類沒有出現任何錯誤，但是，當新增三級分類後，再次新增一級二級

分類就出現錯誤，一級二級分類分別變成二級三級了。

BUG修復方法如下。

1.開啟dede/stepselect_main.php 檔案，找到215行至290行。並將其替換為以下程式碼：

else if($action=='addenum_save') 
{ 
  if(empty($ename) || empty($egroup))  
  { 
         Showmsg("類別名稱或組名稱不能為空！","-1"); 
         exit(); 
    } 
    if($issign == 1 || $topvalue == 0) 
    { 
        $enames = explode(',', $ename); 
        foreach($enames as $ename) 
        { 
            $arr = $dsql->GetOne("SELECT * FROM 

`dede_sys_enum` WHERE egroup='$egroup' AND (evalue MOD 500)=0 ORDER BY disorder

DESC "); 
            if(!is_array($arr)) $disorder = $evalue = ($issign==1 ? 1 : 500); 
            else $disorder = $evalue = $arr['disorder'] + ($issign==1 ? 1 : 500); 
                 
            $dsql->ExecuteNoneQuery("INSERT INTO

`dede_sys_enum`(`ename`,`evalue`,`egroup`,`disorder`,`issign`)  
                                    VALUES('$ename','$evalue','$egroup','$disorder','$issign'); ");  
        } 
        WriteEnumsCache($egroup);                                                           
        ShowMsg("成功新增列舉分類！".$dsql->GetError(), $ENV_GOBACK_URL); 
        exit(); 
    } else if ($issign == 3 && $topvalue != 0) 
    { 
        $minid = $topvalue; 
        $maxnum = 500; // 三級子類最多500個  
        $enames = explode(',', $ename); 
        foreach ($enames as $ename) 
        { 
            $arr = $dsql->GetOne("SELECT * FROM 

`dede_sys_enum` WHERE egroup='$egroup' AND evalue LIKE '$topvalue.%%%' ORDER BY

evalue DESC "); 
            if(!is_array($arr)) 
            { 
                $disorder = $minid; 
                $evalue = $minid.'.001'; 
            } 
            else 
            { 
                $disorder = $minid; 
                preg_match("#([0-9]{1,})\.([0-9]{1,})#", $arr['evalue'], $matchs); 
                $addvalue = $matchs[2] + 1; 
                $addvalue = sprintf("%03d", $addvalue); 
                $evalue = $matchs[1].'.'.$addvalue; 
            } 
            $sql = "INSERT INTO`dede_sys_enum`(`ename`,`evalue`,`egroup`,`disorder`,`issign`)  
                                    VALUES('$ename','$evalue','$egroup','$disorder','$issign'); "; 
            // echo $sql;exit;  
            $dsql->ExecuteNoneQuery($sql);  
        } 
        // echo $minid;  
        WriteEnumsCache($egroup); 
        ShowMsg("成功新增列舉分類！".$issign, $ENV_GOBACK_URL); 
        exit(); 
    } else { 
   $minid = $topvalue; 
   $maxid = $topvalue + 500; 
   $enames = explode(',', $ename); 
      foreach($enames as $ename) 
      { 
    $arr = $dsql->GetOne("Select * From `dede_sys_enum` where egroup='$egroup' And evalue>$minid And evalue<$maxid order by

evalue desc "); 
    if(!is_array($arr)) 
    { 
     $disorder = $evalue = $minid+1; 
    } 
    else 
    { 
     $disorder = $arr['disorder']+1; 
     $evalue = (int)($arr['evalue']+1); 
    } 
    $dsql->ExecuteNoneQuery("Insert into `dede_sys_enum`(`ename`,`evalue`,`egroup`,`disorder`,`issign`) 
                                 values('$ename','$evalue','$egroup','$disorder','$issign'); "); 
       } 
       WriteEnumsCache($egroup); 
   ShowMsg("成功新增列舉分類！".$issign, $ENV_GOBACK_URL); 
   exit(); 
 } 
} 

2.開啟dede/templets/stepselect_main.htm檔案。

找到
if($topvalue % 500 != 0) $arr['issign'] = 2;
修改為
if($topvalue % 500 != 0) $arr['issign'] = 3;
if($topvalue % 500 == 0) $arr['issign'] = 2;

以上這樣修改後1,2,3 聯動能新增，再4級就不行了。因為這裡的標記只判斷到3，dedecms織夢也最多能新增3級聯動。基本足夠用了。

注意：：資料表的名字要替換成#@__這裡是兩個下劃線