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                            使用默認值幾個好處：
1. 如果變量未定義可以防止報錯
2. 如果變量為空可以提供默認值，減少條件判斷，復雜默認值還是要使用條件判斷標簽來實現

給變量設置默認值輸出
```
{$category.name|default='分類名為空'}
{$user.user_nickname|default='這個家伙沒有設置昵稱'}
```

給系統變量設置默認值輸出
```
{$Think.get.name|default="名稱為空"}
```
                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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