这实际上很容易做到。我刚刚改编了this answer

add_action( \'admin_bar_menu\', \'customize_my_wp_admin_bar\', 80 );
function customize_my_wp_admin_bar( $wp_admin_bar ) {

    //Get a reference to the view-site node to modify.
    $node = $wp_admin_bar->get_node(\'view-site\');

    //Change target
    $node->meta[\'target\'] = \'_blank\';

    //Update Node.
    $wp_admin_bar->add_node($node);

}