Convert little endian binary to int in javascript on client (wscript)

I have an array of binary data that was converted using node js

buffer.toString('hex');

And there are 2 integer added in the beginning of the buffer like so:

buffer.WriteInt32LE(index,0);
buffer.WriteInt32LE(id,0);

in the end i got a string like this:

var str = "1100000050000000fd2595200380024"

How can i convert the first two values '11000000' and '50000000' from little endian string to integer, and the rest of the string to binary bytes represented by hex codes? In browser ArrayBuffer is avaliable, but the js executed from windows scripting environment.

via users1582