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                            # 18 default過濾器詳解

## 'default'過濾器:

使用方式'',如果value這個'key'不存在，那么就會使用'default'過濾器提供的默認值。如果想使用類似于'python'中判斷一個值是否為False，那么就必須要傳遞另外一個參數''

可以使用'or' 來替代 'default\('默認值',boolean=True\)'  
例如:''.

[其余見上一節](17-guo-lv-qi-ji-ben-shi-yong.md)


                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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