Борис К,
<!DOCTYPE html>
<html>
<head>
<script>
let go = true, timer;
function rotateEvery(sec)
{
if(go) {
clearTimeout(timer);
return;
}
let Quotation=new Array(
'Мир',
'Труд',
'Май',
'Июнь',
'Июль',
'Август'
);
let which = Math.round(Math.random()*(Quotation.length - 1));
document.getElementById('textrotator').innerHTML = Quotation[which];
timer = setTimeout('rotateEvery('+sec+')', sec*3000);
}
</script>
</head>
<body>
<button onclick="go = !go;rotateEvery(1)">Старт/стоп</button>
<div id="textrotator"></div><audio id="audio"></audio>
</body>
</html>