是的，您可以在循环中使用$wp\\u query->current\\u post来完成此操作。它返回循环内的当前posts索引号（从0开始）。查看以下代码块

<?php
global $wp_query;
while(have_posts()){
    the_post();
    the_title();
    //do your other stuff

    if($wp_query->current_post==1){
        //do what you want to do after 2nd post
    }else if($wp_query->current_post==5){
        //do what you want to do after 6th post
    }
}

在朋友的帮助下，我得到了解决方案：

<?php
        $line = 1;
        $col = 1;
        while(have_posts()) : the_post();
        if ($line % 2 == 0) {
            $class = \'grid_2\'; // class for the 3 smaller posts
        } else {
            $class = \'grid_3\'; // class for the 2 bigger posts
        }
    ?>
        <div class="<?php echo $class; ?>">
            <a href="<?php the_permalink(); ?>"><h3><?php the_title(); ?></h3></a>
            <?php the_excerpt(); ?>
        </div>
    <?php
        if (($col == 2 ) || ($col == 5 )) {
            $line++;
            if ($col == 5) {
                $col = 0;
            }
        }
        $col++;
        endwhile;
    ?>