Javscript30 - 시계

Javascript로 시계 만들기

Vanilla Javascript를 이용하여 시계를 만들어 보았습니다.

HTML, CSS

<div class="clock">
      <div class="clock-face">
        <div class="hand hour-hand"></div>
        <div class="hand min-hand"></div>
        <div class="hand second-hand"></div>
      </div>
    </div>


  <style>
    html {
      background: #018DED url(https://unsplash.it/1500/1000?image=881&blur=5);
      background-size: cover;
      font-family: 'helvetica neue';
      text-align: center;
      font-size: 10px;
    }

    body {
      margin: 0;
      font-size: 2rem;
      display: flex;
      flex: 1;
      min-height: 100vh;
      align-items: center;
    }

    .clock {
      width: 30rem;
      height: 30rem;
      border: 20px solid white;
      border-radius: 50%;
      margin: 50px auto;
      position: relative;
      padding: 2rem;
      box-shadow:
        0 0 0 4px rgba(0,0,0,0.1),
        inset 0 0 0 3px #EFEFEF,
        inset 0 0 10px black,
        0 0 10px rgba(0,0,0,0.2);
    }

    .clock-face {
      position: relative;
      width: 100%;
      height: 100%;
      transform: translateY(-3px); /* account for the height of the clock hands */
    }

    .hand {
      width: 50%;
      height: 6px;
      background: black;
      position: absolute;
      top: 50%;
      transform-origin: 100%;
      transform: rotate(90deg);
      transition-timing-function: cubic-bezier(0.1, 2.7, 0.58, 1);
    }
    .min-hand { height: 4px; }
    .second-hand { height: 2px; background: rgb(156, 0, 0); }
  </style>

Javascript

<script>
    const secondHand = document.querySelector('.second-hand');
    const minsHand = document.querySelector('.min-hand');
    const hourHand = document.querySelector('.hour-hand');

    function setDate() {
      const now = new Date();
      const seconds = now.getSeconds();
      const mins = now.getMinutes();
      const hours = now.getHours();
      
      // second 표현 ((현재초 / 1분은 60초) * 360deg) + 현재 rotate 90;
      const secondsDegrees = ((seconds / 60) * 360) + 90; 
      secondHand.style.transform = `rotate(${secondsDegrees}deg)`;
      
      // minute 표현 ((현재분 / 1시간은 60분) * 360deg) + 현재 rotate 90;
      const minsDegrees = ((mins / 60) * 360) + 90;
      minsHand.style.transform = `rotate(${minsDegrees}deg)`;

      // minute 표현 ((현재분 / 1시간은 60분) * 360deg) + 현재 rotate 90;
      const hoursDegrees = ((hours / 60) * 360) + 90;
      hourHand.style.transform = `rotate(${hoursDegrees}deg)`;
    }

    // 1초에 한번씩 setDate 실행
    setInterval(setDate, 1000);

  </script>

결과