Whether it is a Web product or a Web project, file upload is a frequently used function. In the past, I often heard colleagues doing projects complain: "This file upload control is powerful but troublesome to use, the simplest input upload is easy to use but the function is too simple (for example, it does not support multiple files), and the appearance is not satisfactory." Since then, I have been paying attention to upload controls on the Internet. Recently, I saw a upload plug-in Uploadify based on jquery, which has a good performance in terms of function, appearance, usability and scalability, so I studied it and introduced it to you.