How to nest OR statements in JavaScript?

Question

Currently I am creating a filemanager.

What I want is to check if the user has selected a video file. The file can be mov, f4v, flv<

Answer 1

you need to split them up, like so:

if(ext === "mov" || ext === "f4v" || ext === "flv" || ext === "mp4" || ext === "swf")
{
    // do stuff
}

you could also consider putting all the different extension in an array and checking whether ext exists in that array