有人告诉我，管理ajax现在已经过时了，最好改用REST API，但我想知道如何才能获得与此代码相同的结果，该代码使用REST API生成一个按钮，其中包含基于一些变量和自定义字段的链接？

另外，有人告诉我，这段代码不安全，因为我使用的是HTML响应，而不是ajax中的数据，但我想知道如何为这段代码使用数据？

很抱歉，我对编码还是很陌生

  add_action( \'woocommerce_before_add_to_cart_button\', \'simple_amz_link_ajax\', 10);


function simple_amz_link_ajax() {   
?>
<script>

jQuery(document).ready(function(){

             jQuery.ajax({
                url: "<?php echo admin_url(\'admin-ajax.php\'); ?>",
                type: \'POST\',
                data: {
                         action: \'getmyfunctionform1\',
                         postId: <?php echo get_post()->ID; ?>
                },
                dataType: \'html\',
                success: function(response) {

                jQuery("#buy_amz_btn_wrap").html(response);

                }

        }); 
    });
</script> 
<!-- end Ajax call to getmyfunctionform1 smc 11-22-2013 -->

<div id="buy_amz_btn_wrap"> Loading ... </div>

<?php
}

// Amazon Simple Button Function

add_action(\'wp_ajax_getmyfunctionform1\', \'myfunctionform1\');
add_action(\'wp_ajax_nopriv_getmyfunctionform1\', \'myfunctionform1\');

function myfunctionform1() { 
    $postId = filter_input( INPUT_POST, \'postId\', FILTER_SANITIZE_NUMBER_INT );
    $country_code = $_SERVER ["HTTP_CF_IPCOUNTRY"];
    $de_asin = get_post_meta( $postId, "wccaf_de_asin", true );
    $uk_asin = get_post_meta( $postId, "wccaf_uk_asin", true );    

    $not_avilable_country = \'<div id="amz_not_avilable" class="amz_not_avilable">This product is not avilable in your country yet</div>\';


//////////////////////////////////////////////


if ($country_code=="DE" or $country_code=="DE") {
    $amazon_domain = \'https://www.amazon.de\';
    $associate_id = \'bonstato-21\';
    $asin = $de_asin;
}

else if ($country_code=="GB" && $uk_asin!=="") {
    $amazon_domain = \'https://www.amazon.co.uk\';
    $associate_id = \'bonmedico-21\';
    $asin = $uk_asin;
}

///////////////////

global $post;
        $product = wc_get_product( $postId );
        $type = $product->get_type();
        if( $type == \'simple\' && $asin!="" ){   

                // Amazon Link For Mobile       
                ?>
                <script>
                    function amzGo(){
                        window.location=\'<?php echo $amazon_domain ?>/dp/<?php echo $asin ?>/?tag=<?php echo $associate_id ?>\';
                }
                </script>
                <?php


        ?>
            <div class="buy_amz_btn_wrap" >  
                <button type="button" id="buy_amz_btn" class="buy_amz_btn" onclick="amzGo();"><i class="fa fa-amazon fa-amz"></i><?php echo $amz_btn_title ?></button>                           
            </div>
        <?php
        }

        else if( $type == \'simple\' && $asin=="" ){   
            echo $not_avilable_country;
}


die(); 

} 
?>