如何在 Javascript 中将字节转换为整数？

Question

I'm running a server on Python which sends data to JavaScript. This server however can only send bytes. I'm needing the data to be in integer form. Is there a way to convert this in Javascript.

Here's the line of Code that's receiving the data. How can I transform evt.data from bytes to Integers. What I'm receiving from Python is the b' followed by the number. Example: b'120'

ws.onmessage = function (evt) {
                  var received_msg = evt.data;

Here is the line of code that is used to Send data from Python. It's UDP and unfortunately can only send bytes. I'm sending data from a python server to python client and then to a python websocket server. That python web socket server unfortunately can't send over the bytes converted to ints via the " int() " method.

sock.sendto(bytes(MESSAGE, "utf-8"), (ip_address, UDP_PORT))

What do I need to do? Thanks in Advance: :)

Answer 1

I hope this helps

 function binToInt(bin){ return parseInt(bin, 2); } console.log(binToInt("00101001")); //Outputs 41

Answer 2

Javascript doesn't support 64 bits integers. That said this function should do the trick for 32 bit signed integers:

var byteArrayToInt = function(byteArray) {
    var value = 0;
    for (var i = byteArray.length - 1; i >= 0; i--) {
        value = (value * 256) + byteArray[i];
    }

    return value;
};