How to properly clear memory?

Question

css

I wrote a function to reconnect to the ws channel:

function connect() {
  var ws = new WebSocket('ws://...');

  ws.on('message', function (message) {
    //
  })

  ws.on('close', function () {
    ws.removeAllListeners('message');
    setTimeout(connect, 10000);
  })
}

Even though the on handler is removed, the entire closure still remains in memory. I would like to understand why

Answer 1

can be done by standard means:
1 make a menu where the main items will be what is displayed with large buttons
2 child items that will be displayed when hovering below
3 add css, if desired, js

Answer 2

Try ws = null;it in a handler close.

Answer 3

Remains because connect is involved in setTimeout.