这应该可以做到(将其放在网络激活的插件中):
add_filter( \'myblogs_blog_actions\', \'my_sites_visit_site_target_blank\', 10, 2 );
function my_sites_visit_site_target_blank( $actions, $user_blog ) {
$to_replace = ">" . __( \'Visit\' ) . \'</a>\';
$to_replace_with = " target=\'_blank\' >" . __( \'Visit\' ) . \'</a>\';
return str_replace( $to_replace, $to_replace_with, $actions );
}