下面的jquery代码在本地服务器上运行良好，但在远程服务器上不起作用。仅供参考，远程服务器正在识别jquery。我通过My Stackoverflow Q获得了该代码
请在Merry Flowers Admission Page处检查问题页面。当我输入banana8@gmail.com作为电子邮件ID（在Parent Info中）并按Tab键时，所有后续的表单元素都应该自动填充。但在这里它没有这样做。
以下是chrome开发者工具中针对/students/get_parent_info的网络头文件：

Request URL:http://www.merryflowers.com/students/get_parent_info
Request Method:POST
Status Code:200 OK
Request Headersview source
Accept:*/*
Accept-Charset:ISO-8859-1,utf-8;q=0.7,*;q=0.3
Accept-Encoding:gzip,deflate,sdch
Accept-Language:en-US,en;q=0.8
Connection:keep-alive
Content-Length:52
Content-Type:application/x-www-form-urlencoded; charset=UTF-8
Cookie:CAKEPHP=b0103aa50047806a7063301569298541
Host:www.merryflowers.com
Origin:http://www.merryflowers.com
Referer:http://www.merryflowers.com/students/add
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.19 (KHTML, like Gecko) Chrome/18.0.1025.162 Safari/535.19
X-Requested-With:XMLHttpRequest
Form Dataview URL encoded
data[MerryParent][email]:banana8@gmail.com
Response Headersview source
Connection:Keep-Alive
Content-Type:text/html; charset=UTF-8
Date:Fri, 20 Apr 2012 18:56:03 GMT

Keep-Alive:timeout=5, max=100
P3P:CP="NOI ADM DEV PSAi COM NAV OUR OTRo STP IND DEM"
Server:Apache
Transfer-Encoding:chunked
X-Powered-By:PHP/5.2.17

网络响应和预览：

****************************************

仅供参考，我已经验证了banana8@gmail.com存在现有记录。
阅读lazerblade的答案后，我检查了www和public_html文件夹中的index.php和test.php。我在远程服务器上的根目录是/home/aquinto 1。我很早以前就对这些文件进行了修改。现在我没有修改这里的任何内容。
下面是我的代码：
index.php

if (!defined('ROOT')) {
    define('ROOT', DS.'home'.DS.'aquinto1');  
    //define('ROOT', dirname(dirname(dirname(__FILE__))));
}
/**
 * The actual directory name for the "app".
 *
 */

if (!defined('APP_DIR')) {
    define('APP_DIR','app');
    //define('APP_DIR', basename(dirname(dirname(__FILE__))));
}
/**
 * The absolute path to the "cake" directory, WITHOUT a trailing DS.
 *
 */

if (!defined('CAKE_CORE_INCLUDE_PATH')) {
    //define('CAKE_CORE_INCLUDE_PATH', ROOT);
    define('CAKE_CORE_INCLUDE_PATH', DS.'home'.DS.'aquinto1');

}

test.php

if (!defined('ROOT')) {
    define('ROOT', DS.'home'.DS.'aquinto1');  
    //define('ROOT', dirname(dirname(dirname(__FILE__))));
}
/**
 * The actual directory name for the "app".
 *
 */

if (!defined('APP_DIR')) {
    define('APP_DIR','app');
    //define('APP_DIR', basename(dirname(dirname(__FILE__))));
}
/**
 * The absolute path to the "cake" directory, WITHOUT a trailing DS.
 *
 */

if (!defined('CAKE_CORE_INCLUDE_PATH')) {
    //define('CAKE_CORE_INCLUDE_PATH', ROOT);
    define('CAKE_CORE_INCLUDE_PATH', DS.'home'.DS.'aquinto1');
}

<script type="text/javascript">
   //var j=jQuery.noConflict();
  $(document).ready(function(){
      $("#MerryParentEmail").change(function(){
        //txt=$("#MerryParentEmail").val();
        email_id=$("#MerryParentEmail").serialize();
        $.post("/students/get_parent_info",email_id,function(result_str){
        result_array=result_str.split('*****');
          $("#MerryParentInitial").val(result_array[0]);
          $("#MerryParentName").val(result_array[1]); 
          $("#MerryParentLandline").val(result_array[2]);
          $("#MerryParentMobile").val(result_array[3]); 
          $("#MerryParentAddress").val(result_array[4]);
          $("#MerryParentStateId").val(result_array[5]);
          state=result_array[5];
          txt_str="state_id="+state;
          $.get("/students/getcities",txt_str,function(result){
            $("#MerryParentCityId").html(result).show();
            $("#MerryParentCityId").val(result_array[6]);
          });
          $("#MerryParentPostalCode").val(result_array[7]);
        });
      });

       $("#MerryParentStateId").change(function(){
        state=$(this).val();
        txt_str="state_id="+state;
        $.get("/students/getcities",txt_str,function(result){
            $("#MerryParentCityId").html(result).show();
        });
       });
 });
 </script>

学生控制器的获取家长信息函数和获取城市函数：

function get_parent_info(){
//$this->layout=false;
 if (!empty($this->data)){

    $merryparent_info=$this->Student->MerryParent->getMerryParents($this->data['MerryParent']['email']);
    print_r($merryparent_info);
    echo $merryparent_info['MerryParent']['initial'].'*****';
    echo $merryparent_info['MerryParent']['name'].'*****';
    echo $merryparent_info['MerryParent']['landline'].'*****';
    echo $merryparent_info['MerryParent']['mobile'].'*****';
    echo $merryparent_info['MerryParent']['address'].'*****';
    echo $merryparent_info['MerryParent']['state_id'].'*****';
    echo $merryparent_info['MerryParent']['city_id'].'*****';
    echo $merryparent_info['MerryParent']['postal_code'].'*****';
    }
}

function getcities(){
    $this->data['MerryParent']['state_id']=$_GET['state_id'];
    if (!empty($this->data['MerryParent']['state_id'])){
       $cities = $this->Student->MerryParent->City->getCities($this->data['MerryParent']['state_id']);
    //print_r($cities);
    foreach ($cities as $k=>$v){
            echo '<option value="'.$k.'">'.$v.'</option>';
    }

        /* foreach($cities as $optionValue){
            echo '<option>' . $optionValue . '</option>';
        }*/
    }else{
        $this->Session->setFlash('You didn\'t select a state!');
    }

}