<?= $this->formText('user_profile[email]', null, array('class' => 'textfield email onlyEmail')); ?>
 
//zend 输出后如下
<input type="text" class="textfield email onlyEmail" value="" id="user_profile_inv-email" name="user_profile_inv[email]">
//js

    $.validator.addMethod("onlyEmail", function(value, element) {    
 return eval($.ajax({
     url: "/user/ajaxrpc/exsitcheck",
     type: 'POST',
     async: false,
     data: {
  val:value,
  name:'email',
  base:"user_profile"
     }
 }).responseText);
 
    }, "Email has been exist!");

public function exsitcheckAction() {
 //init db object
 $db;
 $base = $this->_request->getPost('base');
 $name = $this->_request->getPost('name');
 $data = $this->_request->getPost('val');
 if ($base == 'user_profile') {
     $db = new User_Model_ProfileMapper();
 }
 
 if ($db) {
     if ($this->dataNoExist($name, $data, $db)) {
  echo true;
     }
 }
 echo false;
    }