/**
* Get the add to cart button text.
*
* @return string
*/
public function add_to_cart_text() {
$text = $this->is_purchasable() && $this->is_in_stock() ? __( 'Add to cart', 'woocommerce' ) : __( '产品详情', 'woocommerce' );

return apply_filters( 'woocommerce_product_add_to_cart_text', $text, $this );
}