文本属性在 WOOF 中无效，因为 WooCommerce 不支持它们

From woocommerce version 3.3.2 text attributes not supported, use only selectable attributes which supported. WOOF doesn work with text attributes!

• https://wordpress.org/support/topic/updated-to-3-3-1-and-text-attributes-now-all-select-type/
• https://wordpress.org/support/topic/attributes-all-set-to-select-after-update-3-3/
• https://github.com/woocommerce/woocommerce/issues/19178

Minimal woocommerce version for WOOF: v.3.4 (2020 年)