WordPress有摘要显示摘要 没摘要自动截取一段正文的内容作为摘要，实现方法如下：

 <?php if (has_excerpt()) {  
                echo $description = get_the_excerpt(); 
				//When there is a summary, display the summary entered when entering the article 
            }else {  
                echo mb_strimwidth(strip_tags(apply_filters('the_content', $post->post_content)), 0, 170,"……"); 
				//Automatically truncate a paragraph of the main text as a summary when no summary is entered 
            } 
			?>