php - Jquery Ajax调用获取json结果 'undefined'

Question

我想使用 Jquery 获取 json 结果。现在我总是得到“未定义”的结果。我可以使用 json 打印出来

alert(data);

但总是使用返回“未定义”

alert(data.first_name);

Jquery客户端代码

$.post(
    "/modules/services/userlogincheck_new.php",
    {
        dataType: 'jsonp',
        action : "checkpassword",
        email : email,
        password : password
    },
    function(data) {
        alert(data.first_name);
    }
);

PHP 服务器端

if ($_POST['action'] == "checkpassword") {
    $query = "select * from users where email='" . $email . "'";
    $result = mysql_query($query, $forumdbcon) or die('Error, insert query failed');

    while ($row = mysql_fetch_assoc($result)) {
        if (($row['password'] == md5($password))) {
            $arr = array("response" => 1, "first_name" => $row['first_name'], "last_name" => $row['last_name'], "address" => $row['address1']);
            echo json_encode($arr);
        } else {
            $arr = array("response" => 2);
            echo json_encode($arr);
        }
    }
}

Answer 1

试试这个:

$.post("/modules/services/userlogincheck_new.php", {
   action : "checkpassword",
   email : email,
   password : password
}, function(data) {
   alert(data.first_name);
},'json');