使用ajax调用返回json记录时分析错误

我对MVC、Ajax的概念以及它们如何协同工作从数据库中调用数据还很陌生，请耐心等待：）

我遇到了错误：

解析错误语法错误意外的标记<[对象，对象]

当我从数据库返回值时。

我不确定：

1. 我是否正确地将数据从ajax传递到要解析的查询，因为我使用了bindParam以便可以正确地发布变量，但我没有看到任何结果
2. 我是否正确格式化了ajax调用

服务器端

quiz_controller.php

switch($_POST['action']) {
case 'get_users':
    print $users->getUsers($questID);
break;
}

Quiz.php

$questID = $db->$_POST['qid'];
class Quiz {
private $dbh;
public function __construct($host,$user,$pass,$db)  {       
    $this->dbh = new PDO("mysql:host=".$host.";dbname=".$db,$user,$pass);       
}
//getQuestion : To get single questions related fields
public function getUsers(){             
    //$sth = $this->dbh->prepare("SELECT a.questID, a.questTitle, a.questDesc, b.qCatName,c.qTypTitle FROM eq_question AS a INNER JOIN eq_question_category AS b ON a.qCatID = b.qCatID INNER JOIN eq_question_type AS c ON a.qTypID WHERE questID= $questID ");
    $sth = $this->dbh->prepare("SELECT a.questID, a.questTitle, a.questDesc, b.qCatName,c.qTypTitle FROM eq_question AS a INNER JOIN eq_question_category AS b ON a.qCatID = b.qCatID INNER JOIN eq_question_type AS c ON a.qTypID WHERE questID= :parameter ");
    //$sth->bindParam(':parameter', $questID, PDO::PARAM_STR);
    $sth->bindParam(':parameter', $questID);
    $sth->execute();
    return json_encode($sth->fetchAll());
}

客户端

quiz_controller.js

$(function() {  
    $(document).on("click", "button#ct", function(){ getUserList(this); }); 
}
function getUserList(element) {
    alert('worked!');
    $('#indicator').show();
    qid = 3;
    alert('worked assign qid    !');
    alert(qid+'is the qid');
        $.ajax({
            type: "POST",
            url: "../../equizz/app/controller/quiz_controller.php",
            dataType: "json",
            data: {
             "questID":qid, //page: value in the url php  : currentpage: value in js 
             //action: 'get_users'
             action: 'get_users'
            },
            success: function(data){
                alert('data now is '+data);
                renderUserList(data);
                $('#indicator').hide();
            },//success: function(data) END
            error: function(XMLHttpRequest, textStatus, errorThrown) { 
                alert('error!');
                alert(textStatus+"  " + errorThrown +"  " + XMLHttpRequest); 
            } //error END
        });//$.ajax() END
}//getUserList END
function renderUserList(jsonData) {
    //ACW- instead of generate a new table of content. Replace content inside related ID fields!
    var table = '</nav><!--Top Navigation END--><div class="content black"><div class="title dark-gray-text black grid-parent"><div class="grid-100">';
    $.each( jsonData, function( index, user){
        table += '<h2 class="title-2" id="qNumberv">'+'Question No.'+user.questID+'</h2>';
        table += '</div><div class="grid-100 grid-parent">';
        table += '<h1 class="grid-33 mobile-grid-50 " id="qCatv"><!--Question Category-->'+user.qCatName+'</h1>';
        table += '<h1 class="center-4text grid-33 mobile-grid-50-text4right " id="strikesv"><!--Strikes-->'+'00 Strikes'+'</h1>';
        table += '<h1 class="right right-title right-4text grid-33 mobile-grid-50-text4right " id="scorev"><!--Score-->'+'00 Scores'+'</h1</div></div><!--title END-->';
        table += '<section class="question-content"><!--Question Details--><h3 class="question shadow-body grid-100" id="qTitlev" ><!--Question Title-->'+user.questTitle+'</h3>';
        table += '<!--Question Description--><p class="question-detail shadow-body grid-100" id="qDescv" >'+user.questDesc+'</p></section></div><!--content END-->';    
    }); 
    $('div#qcontent').html(table);

}

附加信息：

1. （固定）警报的错误显示parse errror syntax error Unexpected token < [object, object]
2. 关于prevenDefault()，关于写$.each( jsonData, function( index, user){的行，但我不知道如何修复它
3. 查询本身是完美的，但我不确定Perimeter的应用

更新：

我发现我对控制器文件的调用状态如下：

Request URL:http:.../app/controller/quiz_controller.php
Request Method:POST
Status Code:200 OK
Request Headersview source
Accept:application/json, text/javascript, */*; q=0.01
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-US,en;q=0.8
Cache-Control:no-cache
Connection:keep-alive
Content-Length:26
Content-Type:application/x-www-form-urlencoded; charset=UTF-8
Cookie:PHPSESSID=fpm2m9kl4rd8ijgvqlkmv0kvc5
Host:10.9.44.118
Origin:http://10.9.44.118
Pragma:no-cache
Referer:http:.../app/equizz/public/index.php
User-Agent:Mozilla/5.0 (Windows NT 5.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36
X-Requested-With:XMLHttpRequest
Form Dataview sourceview URL encoded
questID:3
action:get_users
Response Headersview source
Connection:Keep-Alive
Content-Length:292
Content-Type:text/html
Date:Mon, 25 Nov 2013 16:19:43 GMT
Keep-Alive:timeout=5, max=100
Server:Apache/2.4.3 (Win32) OpenSSL/1.0.1c PHP/5.4.7
X-Powered-By:PHP/5.4.7

注意：我将文件的实际路径替换为。。。出于安全原因。

$sth->bindParam(':parameter', $_POST['qid']);