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                【基礎用法】 名稱:empty 功能:判斷某個變量是否為空,可以嵌套到任何標簽里面使用,比如:channel、type等 語法: {eyou:empty name='$eyou.field.seo_title' /} {$eyou.field.title} {/eyou:empty} 文件: 無 參數: name='' 變量名 底層字段: 無 【更多示例】 \-------------------------------示例1-------------------------------- 描述:文檔SEO標題為空時,顯示文檔常規標題;否則顯示SEO標題。 ``` {eyou:empty name='$eyou.field.seo\_title' /} {$eyou.field.title} {eyou:else /} {$eyou.field.seo\_title} {/eyou:empty} ```
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