尝试以下操作，当在购物车项目中找到特定运输类别时，将输出一个灰色的非活动"下订单"订单按钮：

add_filter('woocommerce_order_button_html', 'inactive_order_button_html' );
function inactive_order_button_html( $button ) {
    // HERE define your targeted shipping class
    $targeted_shipping_class = 332;
    $found = false;

    // Loop through cart items
    foreach( WC()->cart->get_cart() as $cart_item ) {
        if( $cart_item['data']->get_shipping_class_id() == $targeted_shipping_class ) {
            $found = true; // The targeted shipping class is found
            break; // We stop the loop
        }
    }

    // If found we replace the button by an inactive greyed one
    if( $found ) {
        $style = 'style="background:Silver !important; color:white !important; cursor: not-allowed !important;"';
        $button_text = apply_filters( 'woocommerce_order_button_text', __( 'Place order', 'woocommerce' ) );
        $button = '<a class="button" '.$style.'>' . $button_text . '</a>';
    }
    return $button;
}

代码进入您的活动子主题（或活动主题）的function.php文件。

要完全删除"下订单"按钮，您将使用以下类似按钮：

add_filter('woocommerce_order_button_html', 'remove_order_button_html' );
function remove_order_button_html( $button ) {
    // HERE define your targeted shipping class
    $targeted_shipping_class = 332;
    $found = false;

    // Loop through cart items
    foreach( WC()->cart->get_cart() as $cart_item ) {
        if( $cart_item['data']->get_shipping_class_id() == $targeted_shipping_class ) {
            $found = true; // The targeted shipping class is found
            break; // We stop the loop
        }
    }

    // If found we remove the button
    if( $found )
        $button = '';

    return $button;
}

代码进入您的活动子主题（或活动主题）的function.php文件。