WordPress 在首页使用 query_posts() 分页 404？

Question

小弟在开发时遇到个问题，思路大概是这样的：

• 设置四种文章类型('post','detail','jingyan','haitao)，相当于与后台的「文章」同级。

• 在首页调取四种文章类型中的所有内容，如下：

<?php
    $paged = get_query_var( 'paged' ) ? get_query_var( 'paged' ) : 1;
    $sticky = get_option( 'sticky_posts' );
    $notcat = explode(',',zm_get_option('not_cat_n'));
    $args = array(
        'category__not_in' => $notcat,
        'post__not_in' => $sticky,
        'post_type'=>array( 'post','detail','jingyan','haitao'),
        'posts_per_page' => 15,
        'paged' => $paged
    );
    query_posts( $args );
?>
<?php if ( have_posts() ) : ?>
<?php while ( have_posts() ) : the_post(); ?>
...
<?php 
    endwhile; pagenavi(); endif; wp_reset_query(); 
?>

• Functions.php 加了这些：

<?php
add_filter('pre_get_posts', 'query_post_type');
function query_post_type($query) {
  if(is_category() || is_tag()) {
    $post_type = get_query_var('post_type');
    if($post_type)
        $post_type = $post_type;
    else
        $post_type = array( 'post','detail','jingyan','haitao');
        $query->set('post_type',$post_type);
        $query->set('posts_per_page', 15);
    return $query;
    }
}

问题来了： 按照这样的方法输出内容后，分页仅按照文章数显示。例如，「Post」下有 60 篇文章，「detail」、「jingyan」、「haitao」各 10 篇。按照想法应分 (60+10*3)/15 = 6 页。然而实际情况为翻至 60/15 = 4 页结束后，第 5、6 页均显示 404.

Copy 别人的 pagenavi()：

<?php
 
// 分页显示
function pagenavi($before = '', $after = '') {
    global $wpdb, $wp_query,$pagenavi_options;
    if (!is_single()) {
        $request = $wp_query->request;
        $posts_per_page = intval(get_query_var('posts_per_page'));
        $paged = intval(get_query_var('paged'));
        $numposts = $wp_query->found_posts;
        $max_page = $wp_query->max_num_pages;
        if(empty($paged) || $paged == 0){
            $paged = 1;
        }
        $pages_to_show = intval($pagenavi_options['num_pages']);
        $pages_to_show = intval(4);
        $pages_to_show_minus_1 = $pages_to_show-1;
        $half_page_start = floor($pages_to_show_minus_1/2);
        $half_page_end = ceil($pages_to_show_minus_1/2);
        $start_page = $paged - $half_page_start;
        if($start_page <= 0) {
            $start_page = 1;
        }
        $end_page = $paged + $half_page_end;
        if(($end_page - $start_page) != $pages_to_show_minus_1) {
            $end_page = $start_page + $pages_to_show_minus_1;
        }
        if($end_page > $max_page) {
            $start_page = $max_page - $pages_to_show_minus_1;
            $end_page = $max_page;
        }
        if($start_page <= 0) {
            $start_page = 1;
        }
        if($max_page > 1 || intval($pagenavi_options['always_show']) == 1) {
            $pages_text = str_replace("%CURRENT_PAGE%", number_format_i18n($paged), "共 %TOTAL_PAGES% 页");
            $pages_text = str_replace("%TOTAL_PAGES%", number_format_i18n($max_page), $pages_text);
            echo $before.'<div class="pagenavi">'."\n";
            if(!empty($pages_text)) {
                echo '<span class="pages">'.$pages_text.'</span>';
            }                   
            if ($start_page >= 2 && $pages_to_show < $max_page) {
                $first_page_text = str_replace("%TOTAL_PAGES%", number_format_i18n($max_page), "&laquo; 第一页");
                echo '<a href="'.esc_url(get_pagenum_link()).'" title="'.$first_page_text.'">'.$first_page_text.'</a>';
                echo '<span class="extend">...</span>';
            }
            previous_posts_link("&laquo;");
            for($i = $start_page; $i  <= $end_page; $i++) {                       
                if($i == $paged) {
                    $current_page_text = str_replace("%PAGE_NUMBER%", number_format_i18n($i), "%PAGE_NUMBER%");
                    echo '<span class="current">'.$current_page_text.'</span>';
                } else {
                    $page_text = str_replace("%PAGE_NUMBER%", number_format_i18n($i), "%PAGE_NUMBER%");
                    echo '<a href="'.esc_url(get_pagenum_link($i)).'" title="'.$page_text.'">'.$page_text.'</a>';
                }
            }
            next_posts_link("&raquo;", $max_page);
            if ($end_page < $max_page) {
                echo '<span class="extend">'."...".'</span>';
                $last_page_text = str_replace("%TOTAL_PAGES%", number_format_i18n($max_page), "最后 &raquo;");
                echo '<a href="'.esc_url(get_pagenum_link($max_page)).'" title="'.$last_page_text.'">最后 &raquo;</a>';
            }
            echo '</div>'.$after."\n";
        }
    }
}
 
?>