pong.js - event listener

pong.js

let p1_key, p2_key
document.addEventListener("keydown",function(ev){
    // keyCode 87 = w, keycode 83 = s
    if(ev.keyCode == 87 || ev.keyCode == 83){
        p1_key = ev.keyCode
    }
    // keycode 38 = arrowUp, keycode 40 = arrowDown
    else if(ev.keyCode== 38 || ev.keyCode==40)
        p2_key = ev.keyCode
})