在jquery中读取响应

Question

我使用最简单的Jquery代码来检查是否向服务器发出请求以检查某些表列并相应地返回true或false ....

    $.ajax({
        type: "POST",
        url: "check_ajax_availablity.php",
        data: "user_name=" + user_name,

        success: function (server_response) {
            alert(server_response);                                
        }
    });

我的PHP脚本是......

<?php
    include 'admin_functions.php';
    if (isset($_REQUEST)) {
        $user_name = $_REQUEST['user_name'];
        $condition = " `UserName` = '" . $user_name . "'";
        $result = $oAdmFun->chk_records('login_admin', $condition);
        if ($result == TRUE) {
            return "N";
        } else {
            return "Y";
        }
    }
?>

问题是警告空白值......

Answer 1

而不是return "N"和return "Y" 尝试使用echo "N"和echo "Y" 希望这会对你有所帮助。