希望您会发现这一点，我正在添加下面的代码。这是一种方式，你也可以用其他方式做事情。

add_action(\'admin_menu\',\'create_admin_menu\');
function create_admin_menu()
{
    add_menu_page   (
                        \'Page Title\',
                        \'Top level menu Title\',
                        \'manage_options\',
                        \'your_unique_slug\',
                        \'your_magic_function\'
                    );

    function your_magic_function()
    {
        include_once(\'first.php\');
    }

    add_submenu_page    (
                            \'your_unique_slug\',
                            \'\',
                            \'\',
                            \'manage_options\',
                            \'your_unique_slug\',
                            \'\'
                        );

    add_submenu_page    (
                            \'your_unique_slug\',
                            \'Submenu2\',
                            \'Submenu2\',
                            \'manage_options\',
                            \'your_unique_submenu_slug1\',
                            \'your_magic_function2\'
                        );


    function your_magic_function2()
    {
        include_once(\'second.php\');
    }

    add_submenu_page    (
                            \'your_unique_slug\',
                            \'Page Title2\',
                            \'Submenu Title2\',
                            \'manage_options\',
                            \'your_unique_submenu_slug2\',
                            \'your_magic_function3\'
                        );

    function your_magic_function3()
    {
        include_once(\'three.php\');
    }
}

<h1>First</h1>

<h2>Second</h2>

<h3>Third</h3>