javascript圓形鐘錶程式碼例項

antzone發表於2017-04-13
原文網址 : https://www.softwhy.com/article-6946-1.html
JavaScript

本章節分享一段程式碼例項，它實現了圓形鐘錶效果。

程式碼如下:

[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>
* {
  margin: 0;
  padding: 0;
}
h1 {
  text-align: center;
  line-height: 100px;
}
body {
  background: #ccc;
}
.circle {
  position: relative;
  width: 300px;
  height: 300px;
  margin: 20px auto;
  border-radius: 50%;
  border: 5px solid #000;
  box-shadow: 0 2px 4px rgba(0,0,0,.5);
}
.circleCenter {
  position: absolute;
  width: 20px;
  height: 20px;
  border-radius: 50%;
  margin-left: -10px;
  margin-top: -10px;
  left: 50%;
  top: 50%;
  z-index: 99;
  background: #000;
}
.pointer div {
  position: absolute;
  left: 50%;
  top: 50%;
  border-top-left-radius: 5px;
  border-top-right-radius: 5px;
  box-shadow: 0 2px 4px rgba(0,0,0,.3);
}
.hourHand {
  width: 10px;
  height: 60px;
  background: #000;
  margin-left: -5px;
  margin-top: -60px;
  transform-origin: 5px 60px;
  -webkit-transform-origin: 5px 60px;
}
.secondsHand {
  width: 2px;
  height: 110px;
  background: #000;
  margin-left: -1px;
  margin-top: -110px;
  transform-origin: 1px 110px;
  -webkit-transform-origin: 1px 110px;
}
.minutesHand {
  width: 6px;
  height: 85px;
  background: #000;
  margin-left: -3px;
  margin-top: -85px;
  transform-origin: 3px 85px;
  -webkit-transform-origin: 3px 85px;
}
.timeTag div {
  position: absolute;
  background: #000;
}
.short {
  width: 2px;
  height: 6px;
  transform-origin: 1px 0px;
  -webkit-transform-origin: 1px 0px;
  margin-left: -1px;
}
.long {
  width: 4px;
  height: 15px;
  transform-origin: 2px 0px;
  -webkit-transform-origin: 2px 0px;
  margin-left: -2px;
}
.midnight {
  width: 100px;
  height: 40px;
  border: 4px solid #000;
  position: absolute;
  left: 50%;
  top: 60%;
  margin-left: -54px;
  line-height: 40px;
  color: #000;
  font-size: 24px;
  text-align: center;
  font-family: arial;
  font-weight: bold;
  box-shadow: 0 2px 4px rgba(0,0,0,.5);
}
</style>
</head>
<body>
<div class="circle">
  <div class="midnight" id="midnight"></div>
  <div class="timeTag" id="timeTag"></div>
  <div class="circleCenter"></div>
  <div class="pointer">
    <div class="hourHand" id="hourHand"></div>
    <div class="minutesHand" id="minutesHand"></div>
    <div class="secondsHand" id="secondsHand"></div>
  </div>
</div>
<script>
function createTimeTag(r, ele) {
  for (var i = 0; i < 60; i++) {
    var tag = document.createElement('div');
    var t = r - Math.cos(6 * i * Math.PI / 180) * r;
    var l = Math.sin(6 * i * Math.PI / 180) * r + r;
    tag.className = i % 5 == 0 ? 'long' : 'short';
    tag.style.cssText = 'top:' + Math.round(t) + 'px;left:' + Math.round(l) + 'px;transform:rotate(' + 6 * i + 'deg);-webkit-transform:rotate(' + 6 * i + 'deg);';
    ele.appendChild(tag);
  }
}
function runtime() {
  var time = new Date();
  var nH = time.getHours();
  var nM = time.getMinutes();
  var nS = time.getSeconds();
  var str = nH >= 12 ? 'PM' : 'AM';
  midnight.innerHTML = str;
  var hDeg = ((nH > 12 ? nH - 12 : nH) + nM / 60 + nS / 3600) * 30;
  var mDeg = (nM + nS / 60) * 6;
  var sDeg = Math.round(nS * 6);
  console.log(sDeg)
  hourHand.style.cssText = 'transform:rotate(' + hDeg + 'deg);-webkit-transform:rotate(' + hDeg + 'deg);';
  minutesHand.style.cssText = 'transform:rotate(' + mDeg + 'deg);-webkit-transform:rotate(' + mDeg + 'deg);';
  secondsHand.style.cssText = 'transform:rotate(' + sDeg + 'deg);-webkit-transform:rotate(' + sDeg + 'deg);';
}
var timeTag = document.getElementById('timeTag');
var hourHand = document.getElementById('hourHand');
var minutesHand = document.getElementById('minutesHand');
var secondsHand = document.getElementById('secondsHand');
var midnight = document.getElementById('midnight');
createTimeTag(150, timeTag);
runtime();
setInterval(runtime, 1000)
</script>
</body>
</html>

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