您可以为自定义字段使用自定义插件

function fb_custom_search_where($where) {
    // put the custom fields into an array
    $customs = array(\'custom_field1\', \'custom_field2\', \'custom_field3\');

    foreach( $customs as $custom ) {
    $query .= " OR (";
    $query .= "( m.meta_key = \'$custom\' )";
    $query .= " AND ( m.meta_value  LIKE \'{$n}{$term}{$n}\' )";
        $query .= ")";
    }

    $where = " AND ({$query}) AND ($wpdb->posts.post_status = \'publish\') ";
    return($where);
}
add_filter( \'posts_where\', \'fb_custom_search_where\' );