js鐘錶效果程式碼例項

admin發表於2017-04-17
JS

分享一段程式碼例項，它利用js操作dom實現了圓形鐘錶效果。

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>
<script>
window.onload = function() {
  var clock = document.createElement('div');
  clock.style.width = '600px';
  clock.style.height = '600px';
  clock.style.borderRadius = '50%';
  clock.style.border = '4px solid rgba(0, 0, 0, 0.6)';
  clock.style.position = 'relative';
  clock.style.margin = '0 auto';
 
  var body = document.getElementsByTagName('body')[0];
  body.appendChild(clock);
 
  for (var i = 1; i < 31; i++) {
    var scale = document.createElement('div');
    scale.style.width = '4px';
    scale.style.height = '580px';
    scale.style.borderTop = '10px solid rgba(0, 0, 0, 0.6)';
    scale.style.borderBottom = '10px solid rgba(0, 0, 0, 0.6)';
    scale.style.position = 'absolute';
    scale.style.left = '298px';
    scale.style.transform = 'rotate(' + i * 6 + 'deg)';
    clock.appendChild(scale);
    if (i % 5 == 0) {
      scale.style.borderTop = '18px solid rgba(0, 0, 0, 0.6)';
      scale.style.borderBottom = '18px solid rgba(0, 0, 0, 0.6)';
      scale.style.height = '564px';
      scale.style.width = '8px';
      scale.style.left = '296px';
      var numberBox = document.createElement('div');
      numberBox.style.width = '88%';
      numberBox.style.height = '8px';
      numberBox.style.position = 'absolute';
      numberBox.style.transform = 'rotate(' + (i * 6 + 90) + 'deg)';
      numberBox.style.left = '6%';
      numberBox.style.top = '296px';
      clock.appendChild(numberBox);
 
      for (var j = 1; j < 3; j++) {
        var number = document.createElement('i');
        number.style.display = 'block';
        number.style.fontSize = '30px';
        number.style.textShadow = '2px 2px lightGray';
        number.style.width = '30px';
        number.style.height = '30px';
        number.style.marginTop = '-21px';
        number.style.padding = '10px';
        number.style.textAlign = 'center';
        number.style.lineHeight = '30px';
        number.style.transform = 'rotate(-' + (i * 6 + 90) + 'deg)';
        if (j == 2) {
          number.style.float = 'right';
          number.innerHTML = (i / 5 + 6).toString();
        } else {
          number.style.float = 'left';
          number.innerHTML = (i / 5).toString();
        }
        numberBox.appendChild(number);
      }
    }
  }
 
  var hour = document.createElement('div');
  hour.style.width = '12px';
  hour.style.height = '36%';
  hour.style.background = 'rgba(0, 0, 0, 0.6)';
  hour.style.position = 'absolute';
  hour.style.left = '294px';
  hour.style.top = '14%';
  hour.style.zIndex = '1800';
  hour.style.borderRadius = '4px';
  clock.appendChild(hour);
 
  var minute = document.createElement('div');
  minute.style.width = '8px';
  minute.style.height = '44%';
  minute.style.background = 'orange';
  minute.style.position = 'absolute';
  minute.style.left = '296px';
  minute.style.top = '6%';
  minute.style.zIndex = '1900';
  minute.style.borderRadius = '4px';
  clock.appendChild(minute);
 
 
 
  var second = document.createElement('div');
  second.style.width = '4px';
  second.style.height = '56%';
  second.style.background = 'red';
  second.style.position = 'absolute';
  second.style.left = '298px';
  second.style.zIndex = '2000';
  second.style.borderRadius = '2px';
  clock.appendChild(second);
 
  var dot = document.createElement('div');
  dot.style.width = '16px';
  dot.style.height = '16px';
  dot.style.borderRadius = '50%';
  dot.style.background = 'red';
  dot.style.position = 'absolute';
  dot.style.left = '292px';
  dot.style.top = '292px';
  dot.style.zIndex = '3000';
  clock.appendChild(dot);
 
  var dotMask = document.createElement('div');
  dotMask.style.width = '28px';
  dotMask.style.height = '28px';
  dotMask.style.borderRadius = '50%';
  dotMask.style.background = 'lightGray';
  dotMask.style.opacity = '0.6';
  dotMask.style.position = 'absolute';
  dotMask.style.left = '286px';
  dotMask.style.top = '286px';
  dotMask.style.zIndex = '3001';
  clock.appendChild(dotMask);
 
  hour.style.transformOrigin = 'bottom';
  minute.style.transformOrigin = 'bottom';
  second.style.transformOrigin = '2px 300px';
 
  function clockStart() {
    var currentDate = new Date();
    var currentHour = currentDate.getHours();
    var currentMinute = currentDate.getMinutes();
    var currentSecond = currentDate.getSeconds();
    second.style.transform = 'rotate(' + currentSecond * 6 + 'deg)';
    var minDeg = 6 * currentMinute / 360 * 30;
    hour.style.transform = "rotate(" + (currentHour * 30 + minDeg) + "deg)";
    var secDeg = 6 * currentSecond / 360 * 6;
    minute.style.transform = "rotate(" + (currentMinute * 6 + secDeg) + "deg)";
  }
  clockStart();
  setInterval(clockStart, 1000);
}
</script>
</head>
<body>
</body>
</html>

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