您可以在循环中使用wp_get_attachment_image.

类似（未测试）：

//loop starts

//values for get_posts ( or wp query if you prefer)
$args = array(
   \'post_type\' => \'attachment\',  //gets the attachments aka your images
   \'numberposts\' => -1,
   \'post_parent\' => $post->ID
  );

// some attributes you want added to each image   
$default_attr = array(
   \'class\'  => "background-attachment", //for your javascript
   \'alt\'   =>  \'something\',
   \'title\' => \'\'something
);

//loops through the attachments,
//uses the \'full\' parameter assuming you want the default large image
$attachments = get_posts($args);
if ($attachments) {
    foreach ($attachments as $attachment) {
         echo wp_get_attachment_image($attachment->ID, \'full\', false, $default_attr);
    }
}

//loop ends
//your javascript for full page background via wp_enqueue_script