首先，要使地理定位正常工作，请转到WooCommerce>状态并检查MaxMind GeoIP database 选项，如果有红色复选标记，请按照提供的说明下载数据库。

然后可以将此代码添加到主题中（在functions.php) 或将其添加为插件或code snippet 因为在更新主题时，主题中的更改可能会丢失。

function wpse_287199_woo_checkout_country( $fields ) {
    $geoData = WC_Geolocation::geolocate_ip();
    $countries = WC()->countries->get_countries();

    $fields[\'billing\'][\'billing_country\'] = array(
        \'type\' => \'select\',
        \'label\'     => __(\'Country\', \'woocommerce\'),
        \'options\' => array(
            $geoData[\'country\'] => $countries[$geoData[\'country\']]
        ),
        \'class\' => array(
            \'form-row-wide\',
            \'address-field\',
            \'update_totals_on_change\'
        )
    );

    $fields[\'shipping\'][\'shipping_country\'] = array(
        \'type\' => \'select\',
        \'label\'     => __(\'Country\', \'woocommerce\'),
        \'options\' => array(
            $geoData[\'country\'] => $countries[$geoData[\'country\']]
        ),
        \'class\' => array(
            \'form-row-wide\',
            \'address-field\',
            \'update_totals_on_change\'
        )
    );

    return $fields;
}
add_filter( \'woocommerce_checkout_fields\' , \'wpse_287199_woo_checkout_country\' );