WordPress首页如何调取最新评论代码

WordPress首页如何调取最新评论代码？代码如下

<?php 
     $post_num = 7; // 设置调用条数 
     $args = array( 
     'post_password' =>'',
     'post_status' => 'publish', // 只选公开的文章. 
     'post__not_in' => array($post->ID),//排除当前文章 
     'caller_get_posts' => 1, // 排除置顶文章. 
     'orderby' => 'comment_count', // 依评论数排序. 
     'posts_per_page' => $post_num 
    ); 
      $query_posts = new WP_Query(); 
      $query_posts->query($args); 
      while( $query_posts->have_posts() ) { $query_posts->the_post(); ?> 
  <li ><a href="<?php the_permalink(); ?>" title="<?php the_title(); ?>"><?php  the_title(); ?></a></li> 
    <?php } wp_reset_query();?>