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areaSquare.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
</head>
<body>
<div>
가로: <input id='width'> <br>
세로: <input id='length'> <br>
<button onclick="square()"> 사각형의 넓이 구하기 </button>
<p id="result"> </p>
</div>
<script>
function square() {
let w = Number(document.getElementById('width').value);
let l = Number(document.getElementById('length').value);
if (isNaN(w) || isNaN(l) || !w || !l) {
document.getElementById('result').innerHTML = '빈칸이 있거나 숫자가 아닌 값이 들어있습니다.';
} else {
let squareArea = w * l
document.getElementById('result').innerHTML = '사각형의 넓이는 = ' + squareArea;
}
}
</script>
</body>
</html>