要检查产品是否有标签，可以使用has_term() 或is_object_in_term().

has_term( \'tag_slug_or_ID\', \'product_tag\' )

// checking if the product has any tag
is_object_in_term( $product_id, \'product_tag\' )

// checking if the product has a given tag
is_object_in_term( $product_id, \'product_tag\', \'tag_slug_or_ID\' )