This is what the BT hard disk localization team found on the Internet. It is a foreign source code. It is simple and convenient to use and very compact. It is more like a plug-in than a source code. It is very easy to use. So I share it with everyone in Chinese. The following is an introduction to him from foreign websites. Upload image with AJAX Inserts filenames in database with AJAX Image resize Create thumbnail Keep image aspect ratio Check if image name already exists Unique image name After submit file field is disabled for 5 seconds