Đồng hồ kim với CSS và Javascript

Chia sẻ

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1. HTML

<div class="clock">

    <div class="hour">
      <div class="hr" id="hr"></div>
    </div>

    <div class="min">
      <div class="mn" id="mn"></div>
    </div>

    <div class="sec">
      <div class="sc" id="sc"></div>
    </div>

  </div>

2. CSS

* {
      margin: 0;
      padding: 0;
      box-sizing: border-box;
    }

    body {
      display: flex;
      justify-content: center;
      align-items: center;
      min-height: 100vh;
      background: #212121;
    }

    .clock {
      display: flex;
      width: 350px;
      height: 350px;
      justify-content: center;
      align-items: center;
      background: url(http://samuel-garcia.site/img/clock-sam.png);
      background-size: cover;
      border: 4px solid #191919;
      border-radius: 50%;
      box-shadow: -4px -4px 10px rgba(67, 67, 67, 0.5), inset 4px 4px 10px rgba(0, 0, 0, 0.5), inset -4px -4px 10px rgba(67, 67, 67, 0.3), 4px 4px 10px rgba(0, 0, 0, 0.3);
    }

    .clock:before {
      content: "";
      position: absolute;
      width: 15px;
      height: 15px;
      background: #747474;
      border-radius: 50%;
      z-index: 999;
    }

    .clock .hour,
    .clock .min,
    .clock .sec {
      position: absolute;
    }

    .clock .hour, .hr {
      width: 160px;
      height: 160px;
    }

    .clock .min, .mn {
      width: 190px;
      height: 190px;
    }

    .clock .sec, .sc {
      width: 230px;
      height: 230px;
    }

    .hr, .mn, .sc {
      display: flex;
      justify-content: center;
      /*align-items: center;*/
      position: absolute;
      border-radius: 50%;
    }

    .hr:before {
      content: "";
      position: absolute;
      width: 8px;
      height: 80px;
      background: #ffb510;
      z-index: 9;
      border-radius: 6px 6px 0 0;
    }

    .mn:before {
      content: "";
      position: absolute;
      width: 4px;
      height: 90px;
      background: #8b8b8b;
      z-index: 10;
      border-radius: 6px 6px 0 0;
    }

    .sc:before {
      content: "";
      position: absolute;
      width: 2px;
      height: 150px;
      background: #e5e5e5;
      z-index: 11;
      border-radius: 6px 6px 0 0;
    }

3. JAVASCRIPT

const deg = 6;
    const hr = document.querySelector('#hr');
    const mn = document.querySelector('#mn');
    const sc = document.querySelector('#sc');
    setInterval(() => {
      let day = new Date();
      let hh = day.getHours() * 30;
      let mm = day.getMinutes() * deg;
      let ss = day.getSeconds() * deg;
      hr.style.transform = `rotateZ(${(hh)+(mm/12)}deg)`;
      mn.style.transform = `rotateZ(${mm}deg)`;
      sc.style.transform = `rotateZ(${ss}deg)`;
    })

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