<"commentwelcome">
  <"edit_profile" title="重新填写资料" href="javascript:void(0);"><span>Change</span></a>
  </div>
<"<">      
   <!-- 评论者资料框代码 -->
</div>    
<!-- 评论框代码 -->

$('.hidden').hide();

$('#edit_profile').toggle(function(){
    $('.hidden').slideDown();
    },function(){
    $('.hidden').slideUp();
    });

jQuery(document).ready(function($){
$('.hidden').hide();
$('#edit_profile').toggle(function(){
    $('.hidden').slideDown();
    $('#edit_profile span').text("Finish");
    },function(){
    $('.hidden').slideUp();
    $('#edit_profile span').text("Change Again");
    });
 
});

if (!is_user_logged_in() && !empty($comment_author)) {
...
}

if (!is_user_logged_in() && !empty($comment_author)) {
  $welcome_login = '<p id="welcome-login"><span>欢迎回来, <strong>' . $comment_author . '</strong>.</span>';
  $welcome_login .= ' <span id="toggle-author"><u>更改</u> <i class="icon-signout"></i></span></p>';

  $comments_args['comment_field'] = '</div>' . $comments_args['comment_field'];
  $comments_args['comment_notes_before'] = $welcome_login . '<div id="author-info" class="hide">';
}

/* Toggle comment user */
$('#comments').on('click', '#toggle-author', function () { 
  $('#author-info').slideToggle(function () { 
    if ($(this).is(':hidden')) {
      /* Update author name in the welcome messages */
      $('#welcome-login strong').html($('#author').val());

      /* Update the toggle action name */
      $('#toggle-author u').html('更改');
    } else {
      /* Update the toggle action name */
      $('#toggle-author u').html('隐藏');
    }  
  }); 
});