上一篇、下一篇文章代碼:
<?php previous_post_link('%link','<<') ?>
<?php next_post_link('%link','>>') ?>

該代碼解析出來的代碼大概如下:
<a href="……" rel="external nofollow"  rel="external nofollow" > …… </a>
<a href="……" rel="external nofollow"  rel="external nofollow" > …… </a>

通過 get_previous_post 、 get_next_post 這兩個函數我們可以獲取到上一篇和下一篇文章的相關信息 (大家可以到官網看看這兩個函數的介紹) 。

具體解決方法如下:

<?php previous_post_link('%link','<<') ?>
<?php next_post_link('%link','>>') ?>

替換為
<?php
$prev_post = get_previous_post();
if (!empty( $prev_post )): ?>
  <a title="<?php echo $prev_post->post_title; ?>"
href="<?php%20echo%20get_permalink(%20$prev_post->ID%20);%20?>"
rel="external nofollow" ><?php echo $prev_post->post_title;
?></a>
<?php endif; ?>
<?php
$next_post = get_next_post();
if (!empty( $next_post )): ?>
  <a title="<?php echo $next_post->post_title; ?>"
href="<?php%20echo%20get_permalink(%20$next_post->ID%20);%20?>"
rel="external nofollow" ><?php echo $next_post->post_title;
?></a>
<?php endif; ?>