已更新2： 您的代码中有很多错误和错误……

Updated 2: There are many errors and mistakes in your code…

您的代码中有一种错误的运输方式，因为您只有2：

THERE IS A MISSING SHIPPING METHOD IN YOUR CODE as you only have 2:

• 'shipping_by_rules：16' ==>标准递送（0-10公斤）


• ’shipping_by_rules：15’ ==>第二天交付

• 'shipping_by_rules:16' ==> Standard delivery(0-10kg)
• 'shipping_by_rules:15' ==> Next day delivery

但是标准交付（11-20kg）

您应该尝试以下操作：

add_filter( 'woocommerce_package_rates', 'custom_hide_shipping_methods', 20, 2 );
function custom_hide_shipping_methods( $rates, $package ) {
    $targeted_class_id = 149;  // <== ID OF MY SHIPPING_CLASS
    $has_class = $has_no_class = false;
    
    // Loop through cart items
    foreach( WC()->cart->get_cart() as $cart_item  ) {
        $shipping_class = $cart_item['data']->get_shipping_class_id();
        # $weight = $cart_item['data']->get_weight();
        
        if( $shipping_class == $targeted_class_id ) 
            $has_class = true;
        elseif( empty( $shipping_class ) )
            $has_no_class = true;
    }
    // Unseting shipping methods
    if( $has_class ) 
    { // CASE 1 and 3
        unset( $rates['shipping_by_rules:16'] ); // standard delivery
        # wc_add_notice( sprintf( __( '1 | %s', 'woocommerce' ), $weight ), 'error' );
    }
    elseif( ! $has_class && $has_no_class )
    { // CASE 2
        unset( $rates['shipping_by_rules:15'] ); // next day delivery
        # wc_add_notice( sprintf( __( '2 | %s', 'woocommerce' ), $weight ), 'error' );
    }
    elseif( $has_class && $has_no_class ) // ==> Optional (You may not neeed it)
    { // CASE 3
        unset( $rates['shipping_by_rules:16'] ); // standard delivery
        # wc_add_notice( sprintf( __( '3 | %s', 'woocommerce' ), $weight ), 'error' );
    }
    return $rates;
}

代码位于活动子主题（或活动主题）的function.php文件中

应该可以。