Client js determines the file type and file size, that is, limit the upload size _ javascript skills

The script is required to determine the size and file type on the client. Because there is no suitable method on the internet, I wrote an example to test the file upload size limitation. I would like to share with you the project requirements! The script is required to determine the size and file type on the client! I have worked hard to find information on the Internet! Simply write an example and test the file upload size limit. compatible with browsers such as ie6, ie7, ie8, Google Chrome, and ff.

The Code is as follows: