自动下载行为和后退按钮问题

Instead of linking directly to files for download on a web site we link to a page that says "thank you for downloading". The page has tracking codes on it so we know how many people have downloaded the file. The page launches the download file using the jQuery code shown which adds a short delay after the page loads before the download begins. The download location has a content disposition header so it always downloads properly in the browser leaving the "thank you for downloading" page visible. This all works well.Instead of linking directly to files for downlo