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                            >[info]RGCMS的欄目繼承，意思是：當該欄目某字段為空時，則自動繼承上一級欄目的該字段，直到該字段有值為止。如果該欄目所有上級的該字段都為空，則返回空值。

## **欄目繼承**
用法：`標簽變量|findup="*"`

\* 代表要findup的參數，可默認不寫
>[warning] 當參數不寫時，則為當前欄目的`img` 字段

> 默認為`img`字段：
> `{$nav_img|findup} `當，當前欄目的字段`{$nav_img}`無值為空時，則自動往上級欄目尋找值
> 該場景常用于，建立欄目大圖后，無需設置子欄目大圖，如果設置了子欄目大圖，則顯示子欄目的大圖，否則顯示上級欄目大圖

> 其他字段：
> `{$nav_ename|findup="ename"} `當，當前欄目的字段`{$nav_ename}`無值為空時，則自動往上級欄目尋找`ename`值
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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