<!DOCTYPE html>
<html>
<body>
<h1>JavaScript 配列</h1>
<h2>For In ループ</h2>
<p>for inステートメントは配列値をループできます。</p>
<p id="demo"></p>
<script>
const numbers = [45, 4, 9, 16, 25];
let txt = "";
for (let x in numbers) {
txt += numbers[x] + "<br>";
}
document.getElementById("demo").innerHTML = txt;
</script>
</body>
</html>
