WebProgramming/practice10-6.html at main · huheyun/WebProgramming · GitHub

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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">
  <title>Document</title>
  <script>
    let clock;
    let timer=null;
    function startClock() {
      clock = document.getElementById('clock');
      showTime();
      timer = setInterval('showTime();', 1000);
    }

    function showTime() {
      let time = new Date();
      clock.innerHTML = time.toLocaleTimeString();
    }

    function stop_start_clock() {
      if (timer) {
        clearInterval(timer);
        timer = null;
        clock.style.color = 'gray';
      } else if (timer == null) {
        timer = setInterval('showTime();', 1000);
        clock.style.color = 'black';
      }

    }

  </script>
</head>
<body onload="startClock();">
  <h2>div 태그에 시계 만들기</h2>
  <hr>
  <div id="clock" onclick="stop_start_clock();">

  </div>

</body>
</html>