js和css3實現的圓形鐘錶效果

admin發表於2017-04-12
JSCSSS3

由於css3的廣泛應用，所以實現絢麗的效果已經不再是難事。

下面就通過程式碼例項分享一個javascript結合css3實現的圓形鐘錶效果。

程式碼例項如下:

[HTML] 純文字檢視 複製程式碼
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<meta name="author" content="http://www.softwhy.com/" />
<title>螞蟻部落</title>
<style>
body {
  background: black;
}
.clock {
  position: absolute;
  opacity: 1;
}
.fill .clock {
  left: 50%;
  top: 50%;
}
.centre {
  position: absolute;
  top: 50%;
  left: 50%;
  width: 0;
  height: 0;
}
.expand {
  position: absolute;
  top: 0;
  left: 0;
  transform: translate(-50%, -50%);
}
.anchor {
  position: absolute;
  top: 0;
  left: 0;
  width: 0;
  height: 0;
}
.element {
  position: absolute;
  top: 0;
  left: 0;
}
.round {
  border-radius: 296px;
}
.circle-1 {
  background: white;
  width: 12px;
  height: 12px;
}
.circle-2 {
  background: #FA9F22;
  width: 8px;
  height: 8px;
}
.circle-3 {
  background: black;
  width: 4px;
  height: 4px;
}
.second {
  transform: rotate(180deg);
}
.minute {
  transform: rotate(54deg);
}
 
.second-hand {
  width: 2px;
  height: 164px;
  background: #FA9F22;
  transform: translate(-50%,-100%) translateY(24px);
}
.hour {
  transform: rotate(304.5deg);
}
.thin-hand {
  width: 4px;
  height: 50px;
  background: white;
  transform: translate(-50%,-100%);
}
.fat-hand {
  width: 10px;
  height: 57px;
  border-radius: 10px;
  background: white;
  transform: translate(-50%,-100%) translateY(-18px);
}
.minute-hand {
  height: 112px;
}
.hour-text {
  position: absolute;
  font: 40px Hei, Helvetica, Arial, sans-serif;
  color: white;
  transform: translate(-50%,-50%);
}
.hour-10 {
  padding-left: 0.4ex;
}
.hour-11 {
  padding-left: 0.25ex;
}
.minute-text {
  position: absolute;
  font: 12px Avenir Next, Helvetica, Arial, sans-serif;
  color: white;
  transform: translate(-50%,-50%);
}
.minute-line {
  background: white;
  width: 1px;
  height: 9px;
  transform: translate(-50%,-100%) translateY(-131px);
  opacity: 0.34;
}
</style>
</head>
<body>
  <div class="fill">
    <div class="reference"></div>
    <div class="clock" id="utility-clock">
      <div class="centre">
        <div class="dynamic"></div>
        <div class="expand round circle-1"></div>
        <div class="anchor hour">
          <div class="element thin-hand"></div>
          <div class="element fat-hand"></div>
        </div>
        <div class="anchor minute">
          <div class="element thin-hand"></div>
          <div class="element fat-hand minute-hand"></div>
        </div>
        <div class="anchor second">
          <div class="element second-hand"></div>
        </div>
        <div class="expand round circle-2"></div>
        <div class="expand round circle-3"></div>
      </div>
    </div>
  </div>
  <script>
    var clock = document.querySelector('#utility-clock')
    utilityClock(clock)
 
    if (clock.parentNode.classList.contains('fill')) autoResize(clock, 295 + 32)
 
    function utilityClock(container) {
      var dynamic = container.querySelector('.dynamic')
      var hourElement = container.querySelector('.hour')
      var minuteElement = container.querySelector('.minute')
      var secondElement = container.querySelector('.second')
      var minute = function (n) {
        return n % 5 == 0 ? minuteText(n) : minuteLine(n)
      }
      var minuteText = function (n) {
        var element = document.createElement('div')
        element.className = 'minute-text'
        element.innerHTML = (n < 10 ? '0' : '') + n
        position(element, n / 60, 135)
        dynamic.appendChild(element)
      }
      var minuteLine = function (n) {
        var anchor = document.createElement('div')
        anchor.className = 'anchor'
        var element = document.createElement('div')
        element.className = 'element minute-line'
        rotate(anchor, n)
        anchor.appendChild(element)
        dynamic.appendChild(anchor)
      }
      var hour = function (n) {
        var element = document.createElement('div')
        element.className = 'hour-text hour-' + n
        element.innerHTML = n
        position(element, n / 12, 105)
        dynamic.appendChild(element)
      }
      var position = function (element, phase, r) {
        var theta = phase * 2 * Math.PI
        element.style.top = (-r * Math.cos(theta)).toFixed(1) + 'px'
        element.style.left = (r * Math.sin(theta)).toFixed(1) + 'px'
      }
      var rotate = function (element, second) {
        element.style.transform = element.style.webkitTransform = 'rotate(' + (second * 6) + 'deg)'
      }
      var animate = function () {
        var now = new Date()
        var time = now.getHours() * 3600 +
                    now.getMinutes() * 60 +
                    now.getSeconds() * 1 +
                    now.getMilliseconds() / 1000
        rotate(secondElement, time)
        rotate(minuteElement, time / 60)
        rotate(hourElement, time / 60 / 12)
        requestAnimationFrame(animate)
      }
      for (var i = 1; i <= 60; i++) minute(i)
      for (var i = 1; i <= 12; i++) hour(i)
      animate()
    }
 
    function autoResize(element, nativeSize) {
      var update = function () {
        var scale = Math.min(window.innerWidth, window.innerHeight) / nativeSize
        element.style.transform = element.style.webkitTransform = 'scale(' + scale.toFixed(3) + ')'
      }
      update()
      window.addEventListener('resize', update)
    }
  </script>
</body>
</html>

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