JavaScript judge FileUpload control upload file type _javascript tips

For the code to become more simple, the author used a regular expression to get the file name extension, if the reader is not familiar with the regular expression or have never been contacted, please immediately evil to fill it! After all, it's very important that most programming languages support regular expressions.

As we all know, backstage gets the FileUpload extension method:

String ext = path.getextension (fu. Postedfile.filename);

JS to determine fileupload control upload file extension:

FileUpload Instance Effect diagram:

The above is JS to determine the FileUpload control upload file extension of the implementation method, I hope to help you learn.