html_started/Demo13.html at main · Dominic2k/html_started · GitHub

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<!DOCTYPE html>
<html>
<head>
	<meta charset="utf-8">
	<meta name="viewport" content="width=device-width, initial-scale=1">
	<title></title>
</head>
<body>
<form>
	Nhập số:
	<input type="number" id="input_so">
	<br>
	<button type="button" onclick="kiem_tra()">Kiểm tra số nguyên tố</button>
</form>
<div id="ket_qua"></div>
<script type="text/javascript">
	function kiem_tra(){
		let so = parseInt(document.getElementById('input_so').value);
		let dem_chia_het = 0;
		let ket_qua;
		for(let i = 1; i <= so; i++){
			if(so % 1 == 0){
				dem_chia_het++;
			}
		}
		if(dem_chia_het == 2){
			ket_qua = 'Đúng';
		} else {
			ket_qua = 'Sai';
		}
		document.getElementById('ket_qua').innerHTML = ket_qua;
}
</script>
</body>
</html>