Question

I need to list all the files in the JavaScript thingy, such as using "ls".

Answer 1

Unprivileged JavaScript in a browser can neither list files nor execute programs for security reasons.

In Node.js, for example, executing programs works like this:

var spawn = require('child_process').spawn,
var ls  = spawn('ls', ['-l']);
ls.stdout.on('data', function (data) {
   console.log(data);
});

And there is a direct way to list files using readdir().