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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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