如果您需要随时从标准价格中添加或删除金额，可以在WooCommerce的设置页面中添加自定义字段，然后使用内置过滤器修改产品的价格。

下面是我的做法：（这将放在你的主题中functions.php 文件）

/**
 * Add a new tab to WooCommerce settings pages
**/
function add_wc_settings_tabs( $settings_tabs ) {
    $settings_tabs[ \'modify-price\' ] = __( \'Modify Price\', \'woocommerce\' );

    return $settings_tabs;
}
add_filter( \'woocommerce_settings_tabs_array\', \'add_my_wc_settings_tabs\', 60 );

/**
 * Set up settings fields
**/
function get_my_custom_settings() {
    return array(
        array(
            \'title\'     => __( \'Amount to add\', \'woocommerce\' ),
            \'desc\'      => \'<br/>\' . __( \'Enter an amount to add to each product price\', \'woocommerce\' ),
            \'id\'        => \'price_modification_amount\',
            \'type\'      => \'number\',
            \'min\'       => \'0\',
            \'step\'      => \'.01\',
            \'append\'    => \'€\',
        ),
    );
}

/**
 * Outputs settings fields on the Modify Price settings tab
**/
function my_custom_settings_page() {
    woocommerce_admin_fields( apply_filters( \'wc_get_settings_modify-price\', get_my_custom_settings() );
}
add_action( \'woocommerce_settings_modify-price\', \'my_custom_settings_page\' );

/**
 * Update fields in database when page saved
**/
function update_my_custom_settings() {
    woocommerce_update_options( get_my_custom_settings() );
}
add_action( \'woocommerce_update_options_modify-price\', \'update_my_custom_settings\' );

最后，要根据此金额调整价格，请再次将此函数添加到functions.php:

/**
 * Modify price HTML if a modification is set in Settings
**/
function my_custom_price_html( $output, $product ) {
    $adjustment = get_option(\'price_modification_amount\');

    if ( $adjustment ) {
        $output = wc_price( wc_get_price_to_display( $product ) + $adjustment;
    }
    return $output;
}
add_filter( \'woocommerce_get_price_html\', \'my_custom_price_html\', 30, 2 );

/**
 * Update price in cart if modification set in Settings
**/
function modify_cart_item_price( $cart_item ) {
    $adjustment = get_option(\'price_modification_amount\');

    if ( $adjustment ) {
        $price = $cart_item[\'data\']->get_price() + $adjustment;
        $cart_item[\'data\']->set_price( $price );
        $cart_item[\'my_price\'] = $price;
    }
    return $cart_item;
}
add_filter( \'woocommerce_add_cart_item\', \'modify_cart_item_price\', 30, 1 );

/**
 * Set correct price when reading cart from session
**/
function get_my_cart_item_from_session( $cart_item, $values, $cart_item_key ) {
    if ( ! empty( $cart_item[\'my_price\'] ) ) {
        $cart_item[\'data\']->set_price( $cart_item[\'my_price\'] );
    }
    return $cart_item;
}
add_filter( \'woocommerce_get_cart_item_from_session\', \'get_my_cart_item_from_session\', 30, 3 );