问题是image 不是正确的mime类型。您可以看到list of mime-types here - 因此，根据链表，我们需要传递所需内容的数组：

$supported_mimes = array(
    \'image/jpeg\', \'image/gif\', \'image/png\',
    \'video/avi\', \'video/x-flv\', \'video/mp4\', \'video/ogg\', \'video/webm\',

);

$args = array(
    \'numberposts\'       => -1, // Using -1 loads all posts
    \'orderby\'           => \'menu_order\', // This ensures images are in the order set in the page media manager
    \'order\'             => \'ASC\',
    \'post_mime_type\'    => $supported_mimes
    \'post_parent\'       => $post->ID, // Important part - ensures the associated images are loaded
    \'post_status\'       => null,
    \'post_type\'         => \'attachment\'
);