WordPress使用过滤器wp_trim_excerpt 剥离标签。您可以删除过滤器并创建自己的过滤器，从而允许链接：

<?php
function new_wp_trim_excerpt($text) {
  $raw_excerpt = $text;
  if ( \'\' == $text ) {
    $text = get_the_content(\'\');
    $text = strip_shortcodes( $text );
    $text = apply_filters(\'the_content\', $text);
    $text = str_replace(\']]>\', \']]>\', $text);
    $text = strip_tags($text, \'<a>\');
    $excerpt_length = apply_filters(\'excerpt_length\', 55);
    $excerpt_more = apply_filters(\'excerpt_more\', \' \' . \'[...]\');
    $words = preg_split(\'/(<a.*?a>)|\\n|\\r|\\t|\\s/\', $text, $excerpt_length + 1, PREG_SPLIT_NO_EMPTY|PREG_SPLIT_DELIM_CAPTURE );
    if ( count($words) > $excerpt_length ) {
      array_pop($words);
      $text = implode(\' \', $words);
      $text = $text . $excerpt_more;
      } 
    else {
      $text = implode(\' \', $words);
      }
    }
  return apply_filters(\'new_wp_trim_excerpt\', $text, $raw_excerpt);
  }
remove_filter(\'get_the_excerpt\', \'wp_trim_excerpt\');
add_filter(\'get_the_excerpt\', \'new_wp_trim_excerpt\');