語(yǔ)法錯(cuò)誤：“[object object object]”不是有效的JSON

我對(duì)以下代碼有問(wèn)題。console.log輸出為：

我通過(guò)javascript ajax請(qǐng)求請(qǐng)求的URL是"login.php"：

 <?php include('init.php');
    use Login\LoginService;

    #include(__DIR__.'/Login/LoginService.php');
    
    global $pdo;
    session_start();
    
    $username = $_POST['username'];
    $pass = $_POST['password'];
    if (!empty($username)) {
        $test = new LoginService();
        $user = $test->getUsersLogin($username);
        if (!empty($user) && $user[0]['login'] == $username) {
            $json = json_encode(array("success" => 1));
            echo $json;
        } else {
            $json = json_encode(array("success" => 0));
            echo $json;
        }
    }
    ?>

我通過(guò)js的ajax請(qǐng)求：

$(() => {
    $('.login-form').on('submit', function (e) {
        e.preventDefault();

        $.ajax({
            type: "POST",
            dataType: "json",
            timeout: 500,
            url: '/src/login.php',
            data: $(this).serialize(),

            success: (data) => {
                try {
                    var jso = JSON.parse(data);
                    console.log(jso);
                } catch (e) {
                    console.log(e);
                    return false;
                }
            },
            error: (data) => {
                console.log(JSON.parse(data));
            }
        });
    });
});

為什么php {"success":1}的響應(yīng)不正確？問(wèn)題是什么？

語(yǔ)法錯(cuò)誤：“[object object object]”不是有效的JSON