模拟时钟

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html

css

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html

css

html, body {
  height: 100%;
}

body {
  display: flex;
  align-items: center;
  justify-content: center;
  background-color: #262626;
}

* {
  box-sizing: border-box !important;
}

.clock {
  width: 360px;
  height: 360px;
  padding: 25px;
  background-color: #F7F7F7;
  border-radius: 80px;
  box-shadow: 0 18px 40px rgba(0, 0, 0, 0.15);
}
.clock .inner {
  position: relative;
  width: 100%;
  height: 100%;
  background: #fff;
  border: 5px solid #181818;
  border-radius: 100%;
  box-shadow: 0 0 15px rgba(0, 0, 0, 0.75) inset;
}
.clock .inner .hand {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 7.2px;
  background-color: #181818;
}
.clock .inner .hand.hour {
  height: 90px;
  margin-top: -27.2727272727px;
  -webkit-transform: rotate(0deg) translate(-50%, -50%);
          transform: rotate(0deg) translate(-50%, -50%);
  -webkit-transform-origin: 0 27.2727272727px;
          transform-origin: 0 27.2727272727px;
}
.clock .inner .hand.minute {
  height: 120px;
  margin-top: -27.2727272727px;
  -webkit-transform: rotate(0deg) translate(-50%, -50%);
          transform: rotate(0deg) translate(-50%, -50%);
  -webkit-transform-origin: 0 27.2727272727px;
          transform-origin: 0 27.2727272727px;
}
.clock .inner .hand.second {
  width: 1.9459459459px;
  height: 120px;
  background-color: #ec231e;
  margin-top: -36px;
  box-shadow: -4px -6px 0 0 rgba(0, 0, 0, 0.15);
  -webkit-transform: rotate(0deg) translate(-50%, -50%);
          transform: rotate(0deg) translate(-50%, -50%);
  -webkit-transform-origin: 0 36px;
          transform-origin: 0 36px;
}
.clock .inner .hand.second:before, .clock .inner .hand.second:after {
  content: "";
  display: inherit;
  position: inherit;
  left: inherit;
  background-color: inherit;
  border-radius: 100%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
}
.clock .inner .hand.second:before {
  top: 94.7368421053px;
  width: 18px;
  height: 18px;
  box-shadow: -2px -2px 2px 0 rgba(0, 0, 0, 0.15);
}
.clock .inner .hand.second:after {
  top: 20px;
  width: 10px;
  height: 10px;
  box-shadow: -4px -6px 2px 0 rgba(0, 0, 0, 0.15);
}
.clock .inner .graduations .graduation {
  display: block;
  position: absolute;
  top: 7.5px;
  left: 50%;
  width: 1.9459459459px;
  height: 9px;
  background-color: #181818;
  -webkit-transform: rotate(0deg) translateX(-50%);
          transform: rotate(0deg) translateX(-50%);
  -webkit-transform-origin: 0 140px;
          transform-origin: 0 140px;
}
.clock .inner .graduations .graduation:nth-child(5n-4) {
  width: 4px;
  height: 20px;
}
.clock .inner .graduations .graduation:nth-child(1) {
  -webkit-transform: rotate(1deg) translateX(-50%);
          transform: rotate(1deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(2) {
  -webkit-transform: rotate(7deg) translateX(-50%);
          transform: rotate(7deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(3) {
  -webkit-transform: rotate(13deg) translateX(-50%);
          transform: rotate(13deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(4) {
  -webkit-transform: rotate(19deg) translateX(-50%);
          transform: rotate(19deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(5) {
  -webkit-transform: rotate(25deg) translateX(-50%);
          transform: rotate(25deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(6) {
  -webkit-transform: rotate(31deg) translateX(-50%);
          transform: rotate(31deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(7) {
  -webkit-transform: rotate(37deg) translateX(-50%);
          transform: rotate(37deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(8) {
  -webkit-transform: rotate(43deg) translateX(-50%);
          transform: rotate(43deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(9) {
  -webkit-transform: rotate(49deg) translateX(-50%);
          transform: rotate(49deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(10) {
  -webkit-transform: rotate(55deg) translateX(-50%);
          transform: rotate(55deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(11) {
  -webkit-transform: rotate(61deg) translateX(-50%);
          transform: rotate(61deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(12) {
  -webkit-transform: rotate(67deg) translateX(-50%);
          transform: rotate(67deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(13) {
  -webkit-transform: rotate(73deg) translateX(-50%);
          transform: rotate(73deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(14) {
  -webkit-transform: rotate(79deg) translateX(-50%);
          transform: rotate(79deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(15) {
  -webkit-transform: rotate(85deg) translateX(-50%);
          transform: rotate(85deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(16) {
  -webkit-transform: rotate(91deg) translateX(-50%);
          transform: rotate(91deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(17) {
  -webkit-transform: rotate(97deg) translateX(-50%);
          transform: rotate(97deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(18) {
  -webkit-transform: rotate(103deg) translateX(-50%);
          transform: rotate(103deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(19) {
  -webkit-transform: rotate(109deg) translateX(-50%);
          transform: rotate(109deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(20) {
  -webkit-transform: rotate(115deg) translateX(-50%);
          transform: rotate(115deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(21) {
  -webkit-transform: rotate(121deg) translateX(-50%);
          transform: rotate(121deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(22) {
  -webkit-transform: rotate(127deg) translateX(-50%);
          transform: rotate(127deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(23) {
  -webkit-transform: rotate(133deg) translateX(-50%);
          transform: rotate(133deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(24) {
  -webkit-transform: rotate(139deg) translateX(-50%);
          transform: rotate(139deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(25) {
  -webkit-transform: rotate(145deg) translateX(-50%);
          transform: rotate(145deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(26) {
  -webkit-transform: rotate(151deg) translateX(-50%);
          transform: rotate(151deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(27) {
  -webkit-transform: rotate(157deg) translateX(-50%);
          transform: rotate(157deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(28) {
  -webkit-transform: rotate(163deg) translateX(-50%);
          transform: rotate(163deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(29) {
  -webkit-transform: rotate(169deg) translateX(-50%);
          transform: rotate(169deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(30) {
  -webkit-transform: rotate(175deg) translateX(-50%);
          transform: rotate(175deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(31) {
  -webkit-transform: rotate(181deg) translateX(-50%);
          transform: rotate(181deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(32) {
  -webkit-transform: rotate(187deg) translateX(-50%);
          transform: rotate(187deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(33) {
  -webkit-transform: rotate(193deg) translateX(-50%);
          transform: rotate(193deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(34) {
  -webkit-transform: rotate(199deg) translateX(-50%);
          transform: rotate(199deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(35) {
  -webkit-transform: rotate(205deg) translateX(-50%);
          transform: rotate(205deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(36) {
  -webkit-transform: rotate(211deg) translateX(-50%);
          transform: rotate(211deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(37) {
  -webkit-transform: rotate(217deg) translateX(-50%);
          transform: rotate(217deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(38) {
  -webkit-transform: rotate(223deg) translateX(-50%);
          transform: rotate(223deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(39) {
  -webkit-transform: rotate(229deg) translateX(-50%);
          transform: rotate(229deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(40) {
  -webkit-transform: rotate(235deg) translateX(-50%);
          transform: rotate(235deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(41) {
  -webkit-transform: rotate(241deg) translateX(-50%);
          transform: rotate(241deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(42) {
  -webkit-transform: rotate(247deg) translateX(-50%);
          transform: rotate(247deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(43) {
  -webkit-transform: rotate(253deg) translateX(-50%);
          transform: rotate(253deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(44) {
  -webkit-transform: rotate(259deg) translateX(-50%);
          transform: rotate(259deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(45) {
  -webkit-transform: rotate(265deg) translateX(-50%);
          transform: rotate(265deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(46) {
  -webkit-transform: rotate(271deg) translateX(-50%);
          transform: rotate(271deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(47) {
  -webkit-transform: rotate(277deg) translateX(-50%);
          transform: rotate(277deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(48) {
  -webkit-transform: rotate(283deg) translateX(-50%);
          transform: rotate(283deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(49) {
  -webkit-transform: rotate(289deg) translateX(-50%);
          transform: rotate(289deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(50) {
  -webkit-transform: rotate(295deg) translateX(-50%);
          transform: rotate(295deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(51) {
  -webkit-transform: rotate(301deg) translateX(-50%);
          transform: rotate(301deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(52) {
  -webkit-transform: rotate(307deg) translateX(-50%);
          transform: rotate(307deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(53) {
  -webkit-transform: rotate(313deg) translateX(-50%);
          transform: rotate(313deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(54) {
  -webkit-transform: rotate(319deg) translateX(-50%);
          transform: rotate(319deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(55) {
  -webkit-transform: rotate(325deg) translateX(-50%);
          transform: rotate(325deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(56) {
  -webkit-transform: rotate(331deg) translateX(-50%);
          transform: rotate(331deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(57) {
  -webkit-transform: rotate(337deg) translateX(-50%);
          transform: rotate(337deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(58) {
  -webkit-transform: rotate(343deg) translateX(-50%);
          transform: rotate(343deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(59) {
  -webkit-transform: rotate(349deg) translateX(-50%);
          transform: rotate(349deg) translateX(-50%);
}
.clock .inner .graduations .graduation:nth-child(60) {
  -webkit-transform: rotate(355deg) translateX(-50%);
          transform: rotate(355deg) translateX(-50%);
}

JavaScript

/** Our wonderfull little clock **/
class Clock {

/**
   * Clock initialization
   */
  constructor() {
    
    this.hourHand   = document.querySelector('.hour.hand');
    this.minuteHand = document.querySelector('.minute.hand');
    this.secondHand = document.querySelector('.second.hand');
    this.timer();
    
    setInterval(() => this.timer(), 1000);
  }
  
  /**
   * Timer of the clock
   */
  timer() {
    this.sethandRotation('hour');
    this.sethandRotation('minute');
    this.sethandRotation('second');
  }

/**
   * Changes the rotation of the hands of the clock
   * @param  {HTMLElement} hand   One of the hand of the clock
   * @param  {number}      degree degree of rotation of the hand
   */
  sethandRotation(hand) {
    let date = new Date(), hours, minutes, seconds, percentage, degree;
    
    switch (hand) {
      case 'hour':
        hours       = date.getHours();
        hand        = this.hourHand;
        percentage  = this.numberToPercentage(hours, 12);
        break;
      case 'minute':
        minutes     = date.getMinutes();
        hand        = this.minuteHand;
        percentage  = this.numberToPercentage(minutes, 60);
        break;
      case 'second':
        seconds     = date.getSeconds();
        hand        = this.secondHand;
        percentage  = this.numberToPercentage(seconds, 60);
        break;
    }
  
    degree                = this.percentageToDegree(percentage);
    hand.style.transform  = `rotate(${degree}deg) translate(-50%, -50%)`;
  }

/**
   * Converting a number to a percentage
   * @param  {number} number Number
   * @param  {number} max    Maximum value of the number
   * @return {number}        Return a percentage
   */
  numberToPercentage(number = 0, max = 60) {
    return (number / max) * 100;
  }

/**
   * Converting a percentage to a degree
   * @param  {number} percentage Percentage
   * @return {number}            Return a degree
   */
  percentageToDegree(percentage = 0) {
    return (percentage * 360) / 100;
  }

}

let clock = new Clock();

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