尝试Jquery帖子不工作

Trying to submit data to a server-side script via jquery post failed. I get nothing. What are the possible reasons behind it? Is it that there is a problem with it? It works well on other servers. But only one server, it failed. Please help me resolve this. Below is is the jquery code:

$(".email_validator").blur(function() {
    var clientEmail = $(".email_validator").val();
    $.post("http://website.com/svr/tmb/verify",   
     { email:clientEmail },
     function(data) {
          if(data.error) { 
              alert(data.message);
              $(".email_validator").val("");
          } else { 
              alert(data.message);
          }
     },
     "json");
});

Extract of the server side:

if(!empty($_POST['email']))
{
    if(isValidEmail($_POST['email']))
    {
        exit(json_encode(array('error'=>false,'message'=>'your email ok')));
    }
    else
    {
        exit(json_encode(array('error'=>true,'message'=>'your email is blocled')));
    }

}
else
{
    exit(json_encode(array('error'=>true,'message'=>'no data received')));
}

But this did nothing...