在线抽签工具 - 随机抽取质数和非质数 - 常规

<!DOCTYPE html>
<html>
<head>
	<meta charset='UTF-8'>
	<title>在线抽签工具 - 随机抽取质数和非质数</title>
	<script type='text/javascript'>
		var num, timer;
		function start() {
			document.getElementById('startBtn').innerHTML = '停止';
			timer = setInterval(function() {
				num = Math.floor(Math.random() * 80) + 1;
				if (isPrime(num)) {
					document.getElementById('result1').innerHTML = num;
				} else {
					document.getElementById('result2').innerHTML = num;
				}
			}, 100);
		}
		function stop() {
			clearInterval(timer);
			document.getElementById('startBtn').innerHTML = '开始';
			document.getElementById('finalResult').innerHTML = '质数：' + document.getElementById('result1').innerHTML + '，非质数：' + document.getElementById('result2').innerHTML;
		}
		function isPrime(n) {
			if (n <= 1) {
				return false;
			}
			for (var i = 2; i <= Math.sqrt(n); i++) {
				if (n % i == 0) {
					return false;
				}
			}
			return true;
		}
	</script>
</head>
<body>
	<h1>在线抽签工具 - 随机抽取质数和非质数</h1>
	<p>从数字1-80中，抽出1个质数和1个非质数</p>
	<p>质数：<span id='result1'></span></p>
	<p>非质数：<span id='result2'></span></p>
	<button id='startBtn' onclick='start()'>开始</button>
	<button id='stopBtn' onclick='stop()'>停止</button>
	<p id='finalResult'></p>
</body>
</html>