Template:Is empty/doc

Returns true if the first parameter is assigned no value. It can be useful in de-obfuscating wiki markup. It was created to facilitate adding tracking categories.

用法

Logic

if not x then 1.

if x then <null>.

例

{{#if:{{is empty| }}|empty|not empty}} → empty

{{#if:{{is empty|value}}|empty|not empty}} → not empty