我的refreshContent函数调用不了，我已被这个问题困扰了好几天了 ，就是找不到问题出在哪了，希望大家帮我看看，谢谢！
代码如下：

xajax_smarty.php

  require_once( 'Config/Config.inc.php');
  require_once('xajax/xajax_core/xajax.inc.php');
  $xajax = new xajax();
  function loadContent($n){
      global  $Smarty;
      if($n==0){
       $data[] = array('title' =>'helloworld','content' =>'

what is going on?

');
       $data[] = array('title' =>'another item','content' => '

nothing fancy

');
            }
       else if($n == 1){
           echo '=============';
             $data[] = array('title' =>'Dynamically loaded' , 'content' => '

There you go

');
            }
       $Smarty ->assign('posts' ,$data);
       $ret = $Smarty ->fetch('post.html');
       $Smarty ->clear_all_assign();
       return $ret;
  }
   function refreshContent($formValues){//调用不了
     echo "ldkfjdl";
      $response= new xajaxResponse();
      $newContent = loadContent($formValues['select_page']);
      $response ->addAssign('content' , 'innerHTML' , $newContent);
      return $response;
   }
   $xajax ->registerFunction('refreshContent');
   $xajax->processRequest();
   
   $Smarty ->assign('content' , loadContent(0));
   $Smarty ->assign('xajaxjavascript' , $xajax ->getJavascript('xajax/'));
   $Smarty ->display('main.html');
?>

post.html


<%{foreach from = $posts item = post}%>

<%{/foreach }%>



main.html


<%{$xajaxjavascript}%>

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