您应该为此使用自定义页面。作为参考，我们可以修改默认的（Twenty199POST）内容块。根据您的主题，您可能需要修改single.php, 或其中包含的内容块。在twentynineteen theme，我们可以在网上看到24:

get_template_part( \'template-parts/content/content\', \'single\' );

 23         the_content(
 24             sprintf(
 25                 wp_kses(
 26                     /* translators: %s: Name of current post. Only visible to screen readers */
 27                     __( \'Continue reading<span class="screen-reader-text"> "%s"</span>\', \'twentynineteen\' ),
 28                     array(
 29                         \'span\' => array(
 30                             \'class\' => array(),
 31                         ),
 32                     )
 33                 ),
 34                 get_the_title()
 35             )
 36         );
 37  

the_excerpt(); // Echo the excerpt directly.
$excerpt = get_the_excerpt(); // Store the excerpt in $excerpt.

// Retrieve the "raw" exceprt - this has not passed any filters etc,
// and instead comes directly from the database.
$post = get_post();
echo $post->post_excerpt;

这个twentynineteen 首页由文件控制/wp-content/themes/twentynineteen/index.php. 它包含代码

while (have_posts()) {
  the_post();
  get_template_part(\'template-parts/content/content\');
}

while (have_posts()) {
  the_post();
  get_template_part(\'template-parts/content/content-excerpt\');
}

您需要在PHP更改中修改模板the_content() 到the_excerpt()

此php函数分别打印内容和摘录