为您的after_setup_theme 高于父主题。默认优先级为10。使用twentysixteen 例如，在子主题上使用优先级11\'after_setup_theme\' 行动示例如下：

function twentysixteen_child_setup() {
    add_theme_support( \'post-formats\', array(
        \'video\',
    ) );
}
add_action( \'after_setup_theme\', \'twentysixteen_child_setup\', 11 );

确保您不仅仅是在函数中调用这些函数。php，但使用add\\u action（）在正确的时间调用它们。请尝试以下操作：

// in your Child Theme\'s functions.php    

// Use the after_setup_theme hook with a priority of 11 to load after the
// parent theme, which will fire on the default priority of 10
add_action( \'after_setup_theme\', \'remove_post_formats\', 11 ); 

function remove_post_formats() {

    remove_theme_support( \'post-formats\' );
    add_theme_support( \'post-formats\', array( \'video\' ) );
}