我解决了这个问题，但是有点棘手，我建议将其放在插件中

I solved this problem but a little hacky, I suggest to put it in a plugin

/**
 * Add the order_comments field to the cart
 **/
add_action('woocommerce_cart_collaterals', 'order_comments_custom_cart_field');

function order_comments_custom_cart_field() {
    echo '<div id="cart_order_notes">';

?>
<div class="customer_notes_on_cart">
<label for="customer_notes_text"><?php _e('Order notes','woocommerce'); ?></label>
<textarea id="customer_notes_text"></textarea>
</div>
<?php



}

/**
 * Process the checkout and overwriting the normal button
 *
 */
function woocommerce_button_proceed_to_checkout() {
    $checkout_url = wc_get_checkout_url();
    ?>
       <form id="checkout_form" method="POST" action="<?php echo $checkout_url; ?>">
       <input type="hidden" name="customer_notes" id="customer_notes" value="">
       <a  href="#" onclick="document.getElementById('customer_notes').value=document.getElementById('customer_notes_text').value;document.getElementById('checkout_form').submit()" class="checkout-button button alt wc-forward">
       <?php _e( 'Proceed to checkout', 'woocommerce' ); ?></a>
       </form>
       <?php
     }


// getting the values in checkout again
add_action('woocommerce_checkout_before_customer_details',function(){
?>
<script>
jQuery( document ).ready(function() {
    jQuery('#order_comments' ).val("<?php echo sanitize_text_field($_POST['customer_notes']); ?>");
});
</script>

<?php 

});