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【JavaScript】1から100までの間で、3の倍数（3〜99）の数だけを足した合計値を表示せよ

JavaScript

Last updated at 2021-05-06Posted at 2021-05-06

<!DOCTYPE html>
<html lang="ja">
<head>
   <meta charset="UTF-8">
   <title>1から100までの間で、3の倍数の数だけを足した合計値</title>
</head>
<body>
<script>
    var sum = 0; 
    for (var i = 1; i <= 100; i++) {
        if (i % 3 === 0) {
        document.write('<p>' +  sum + ' + ' + '【'  + i + '】'  + '</p>');
        sum = sum + i ; //sum += i でもOK
        document.write('<p>' + '= ' + sum + '<p>');
        }
    }
    document.write('<h1>' +  '合計：' + sum  + '<h1>');
</script>
</body>
</html>

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