pcbot.js

fn=(delay=5,rands=[20,10,15])=>{
  if(!loop) return;
  console.log("click")
  document.dispatchEvent(new Event('keydown', {keyCode: 'a'}))
  setTimeout(fn, rands.reduce((s,v)=>s+Math.random()*v) +5);
}
startFn=()=>{
    loop = true
    fn()
}
stopFn=()=>{
    loop =false
}

startFn()

stop : stopFn()