根据注释：这就是定制器API的用途。在以下情况下：header 有十几个参数可以用来调整行为。像这样：

$defaults = array(
    \'default-image\'          => \'\',
    \'width\'                  => 0,
    \'height\'                 => 0,
    \'flex-height\'            => false,
    \'flex-width\'             => false,
    \'uploads\'                => true,
    \'random-default\'         => false,
    \'header-text\'            => true,
    \'default-text-color\'     => \'\',
    \'wp-head-callback\'       => \'\',
    \'admin-head-callback\'    => \'\',
    \'admin-preview-callback\' => \'\',
);
add_theme_support( \'custom-header\', $defaults );