为什么AJAX响应为0！让我很恼火！。我想在blur上检查电子邮件地址是否有效。请建议我这是我的代码这是我的php代码

 add_action(\'wp_ajax_send_message_to_customer\',\'add_send_msg\');?>
<form>
    <input type="text" name="email_customer"  id="email_customer"/>
</form>
<div id="email_info"></div>
<?php
function add_send_msg(){
    $email = isset($_POST[\'email_customer\']) ? $_POST[\'email_customer\'] : null; 
    if( $email ){
        if(is_email($email)){
        $msg = \'valid\';
        }
    }
    echo $msg;
    die();
}

    add_action( \'init\', \'my_script_enqueuer\' );

function my_script_enqueuer() {
   wp_enqueue_script( "send_email", path_join(WP_PLUGIN_URL,basename(dirname(__FILE__)).\'/send_email.js\', array(\'jquery\')));
   wp_localize_script( \'send_email\', \'myAjax\', array( \'ajaxurl\' => admin_url( \'admin-ajax.php\' )));        
}

jQuery(document).ready(function () {
    jQuery("input[name=\'email_customer\']").blur(function (){
        dataString = "email_customer="+jQuery(this).attr("value")+"&action=send_message_to_customer";


        jQuery.ajax({
            type: "POST",
            data: "email_customer="+jQuery(this).attr("value")+"&action=send_message_to_customer",
            url: myAjax.ajaxurl,
            beforeSend: function(){
                jQuery("#email_info").html("Checking Email......");
            },          
            success: function(data) {
                alert(data);
                if( data == \'valid\'){
                jQuery("#email_info").html("Email Ok");

            }
            else{
                jQuery("#email_info").html("You have entered invalid email");

            }

        }

        });
    });
});