jquery页面未重新加载(location.reload）

查询返回成功消息后，我的页面不会刷新。我尝试过location.reload((、location.reload(true(，甚至尝试过在"loginFunction.php"页面中使用标头重定向，但似乎都不起作用。

JQuery

if ($.trim(user) != '' && password != '') {
    $.post('includes/loginFunction.php', {
        userName: user,
        uPassword: password
    }, function(data) {
        var result = data;
        if (data !== "success") {
            $('#uNameE').text(data);
        } else {
            window.location.reload(true);
        }
    });
}

PHP

require_once('dbopen.php');
    if(isset($_POST['userName']) === true && empty ($_POST['userName']) === false ){
        $userName = $_POST["userName"];
        $userPass = $_POST["uPassword"];
        $query = $conn->query("SELECT * FROM members WHERE userN = '$userName' AND password = '$userPass'");
        $num = $query->num_rows;
        if($num != 0 ){ 
            $_SESSION['usernameP'] = $userName;
             //Header not working neither
             //header('location: index.php');
            echo "success";
        }
        else{
            echo "Username or password incorrect";
        }       
}