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【JavaScript】現在時刻をリアルタイムで一定時間繰り返す画面を作成せよ。(西暦から秒まで)

JavaScript

Posted at 2021-05-11

<!DOCTYPE html>
<html lang="ja">
<head>
   <meta charset="UTF-8">
   <title>一定間隔で繰り返し実行</title>
   <script>
       function count_time() {
           var timer = document.getElementById('timer');
           var date = new Date();
           timer.innerHTML = date.toLocaleString();
       }
       window.onload = function() {
           // 1秒(1000ミリ秒)ごとにcount_time関数を実行
           setInterval(count_time, 1000);
       }
   </script>
</head>
<body>
   <div id="timer"></div>
</body>
</html>

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