JS-timer/timer.html at main · slawern/JS-timer · GitHub

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<html>
<head>
<meta charset="UTF-8">
<script>
    var mins = 25, secs = 0;
    var isrunning = false;
    var ison = true;
    var siren = new Audio('siren.mp3');
    var bell  = new Audio('bell.mp3');
    var audioon = false;

    function i2s(i) {
	var s = '' + i;
	if (i < 10)
	    s = '0' + s;
	return s;
    }

    function str() {
	s = i2s(mins) + ":" + i2s(secs);
	if(mins == 0)
		s = '<span style="color:red">' + s + '</span>';
	else
		s = '<span style="color:yellow">' + s + '</span>';
	return s;
    }

    function dec() {
	if (secs > 0)
	    secs--;
	else {
	    secs = 59;
	    mins--;
	}
    }

    function go() {
        document.getElementById("counter").innerHTML = str();
	run();
    }

    function run() {
	if (isrunning) {
	    document.getElementById("counter").innerHTML = ison ? str() : "";
	    if(mins == 0 && secs == 30)
	    	bell.play();
            if (mins == 0 && secs == 0) {
		ison = !ison;
		if(!audioon) {
			bell.pause();
			audioon = true;
			siren.play();
		}
	    }
	    else
		dec();
	}
	setTimeout(run, 1000);
    }
</script>

</head>
<body style="background: black; color: yellow" onload="go();">
<form>
    <input type="button" name="start" value="Start" onclick="isrunning = true;">
    <input type="button" name="stop" value="Stop"  onclick="isrunning = false;">
</form>
<div id="counter" style="text-align:center; width: 90%; margin-left: auto; margin-right: auto; margin-top: 50px; font-size: 350px; font-family: monospace; font-weight: bold">
</div>
</body>
</html>