jQuery挂在墙上的钟表

【前言】

分享个特效，jQuery挂在墙上的钟表。原理很简单，注意点：①transform-origin 属性设置旋转元素的基点位置；transform转换；

效果图：

jQuery挂在墙上的钟表

【主体】

<!DOCTYPE html>
<html >
<head>
  <meta charset="UTF-8">
  <title>jQuery挂在墙上的圆盘时钟动画特效</title>
  <link rel="stylesheet" href="css/style.css">
  <script src="js/prefixfree.min.js"></script>
</head>
<body>
  <div class="support"></div>
<div class="clock">
  <div class="numbers">
    <ul>
      <li>12</li>
      <li>3</li>
      <li>6</li>
      <li>9</li>
    </ul>
  </div>
  <div class="clockwise">
    <div class="center"></div>
    <div class="hand-second" id="analogsecond"></div>
    <div class="hand-minute" id="analogminute"></div>
    <div class="hand-hour" id="analoghour"></div>
  </div>
</div>
  <script src='js/jquery.min.js'></script>
    <script  src="js/index.js"></script>
</body>
</html>

*, *:before, *:after {
  box-sizing: border-box;
}

html {
  height:100%;
}

body {
  background: radial-gradient(center center, circle cover, #c9c2b6, #7a726f);
  background: -moz-radial-gradient(center center, circle cover, #c9c2b6 0%, #7a726f 100%);
  background: -webkit-radial-gradient(center center, circle cover, #c9c2b6 0%, #7a726f 100%);
  font-family: Arial, helvetica, 'sans';
}
.clock {
  width:193px;
  height:193px;
  border-radius:50%;
  margin:auto;
  position:absolute;
  top:0; right:0; bottom:0; left:0;
  background:#f0f1e9;
  box-shadow: 0 10px 20px rgba(0,0,0,0.2), inset 0 3px 0 rgba(255,255,255,0.5), inset 0 -4px 0 rgba(0,0,0,0.1), 0 2px 5px rgba(0,0,0,0.2);
  /* background: linear-gradient(top, #f0f1e9, #f0f1e9 100%);*/
}
.clock::before {
  content:'';
  width:130px;
  height:130px;
  position:absolute;
  margin:auto;
  top:0; right:0; bottom:0; left:0;
  border-radius:50%;
  background: -webkit-linear-gradient(top, #e9eae2, #f5f5ec 100%);
  background: -moz-linear-gradient(top, #e9eae2, #f5f5ec 100%);
  background: linear-gradient(top, #e9eae2, #f5f5ec 100%);
}

.numbers, clockwise {
  width:100%;
  height:100%;
  border-radius:50%;
}

.numbers ul {
  list-style:none;
}

.numbers ul li {
  position:absolute;
  width:1.5em;
  height:1.5em;
  text-align:center;
  line-height:1.5em;
  font-size:1.3em;
  color:#a5a595;
}

.numbers ul li:first-child {
  top:0;
  left:50%;
  margin-left:-0.75em;
}
.numbers ul li:nth-child(2){
  top:50%;
  right:0;
  margin-top:-0.75em;
}
.numbers ul li:nth-child(3){
  left:50%;
  bottom:0;
  margin-left:-0.75em;
}
.numbers ul li:last-child{
  top:50%;
  left:0;
  margin-top:-0.75em;
}

.clockwise .center, .support {
  position:absolute;
  width:10px;
  height:10px;
  border-radius:50%;
  background: radial-gradient(center center, circle , #ffffff, #837874 97%, #b4b2aa 100%);
  background: -moz-radial-gradient(center center, circle,#ffffff, #837874 97%, #b4b2aa 100%);
  background: -webkit-radial-gradient(center center, circle , #ffffff, #837874 97%, #b4b2aa 100%);
  background-position:50% -12px;
  box-shadow: 0 3px 5px rgba(0,0,0,0.3);
}

.clockwise .center {
  left:50%; margin-left:-5px;
  top:50%; margin-top:-5px;
  z-index:5;
}

.support {
  margin:auto;
  top:-260px; right:0; bottom:0; left:0;
  box-shadow: 0 5px 5px rgba(0,0,0,0.4), 0 -1px 2px rgba(0,0,0,0.3);
}

.support::before {
  content:'';
  width:4px;
  height:100px;
  background:#fff;
  position:absolute;
  z-index:-1;
  transform:rotate(38deg);
  transform-origin:50% 0%;
  top:5px;
  left:3px;
  background: linear-gradient(left, #f3f3f3, #fff);
  box-shadow: 4px 3px 3px rgba(0,0,0,0.2), inset 1px 0 4px rgba(0,0,0,0.2);
}
.support::after {
  content:'';
  width:4px;
  height:100px;
  background:#fff;
  position:absolute;
  z-index:-1;
  transform:rotate(-38deg);
  transform-origin:50% 0%;
  top:5px;
  left:1px;
  background: linear-gradient(left, #f3f3f3, #fff);
  box-shadow: -2px 3px 3px rgba(0,0,0,0.2), inset 1px 0 4px rgba(0,0,0,0.2);
}

[class*="hand-"] {
  border-radius: 100% 100% 5px 5px;
  box-shadow: 0 0 0.5em rgba(black,0.2);
  left: 50%;
  position: absolute;
  top: 50%;
  z-index: 4;
  box-shadow:0 5px 5px rgba(0,0,0,0.3);
}
.hand-second {
  width: 2px;
  top: 18px;
  height: 78px;
  background:#f16e54;
    transform-origin: 50% 100%;
}

.hand-minute {
  width: 6px;
  top:26px;
  margin-left:-3px;
  height: 88px;
  background:#68645b;
  transform-origin: 50% 80%;
}

.hand-hour {
  width: 6px;
  top: 56px;
  transform-origin: 50% 40px;
  margin-left:-3px;
  height: 50px; 
  background:#68645b;
}

var oClockAnalog = {
    aSecond:         [],
    dtDate:          new Date(),
    iCurrSecond:     -1,
    iHourRotation:   -1,
    iMinuteRotation: -1,
    iStepSize:       10,
    iTimerAnimate:   setInterval("oClockAnalog.fAnimate()", 20),
    iTimerUpdate:    setInterval("oClockAnalog.fUpdate()", 1000),

    fAnimate:       function() {
        if (this.aSecond.length > 0) {
            this.fRotate("analogsecond", this.aSecond[0]);
            this.aSecond = this.aSecond.slice(1);
        }
    },
    fGetHour:     function() {
        var iHours = this.dtDate.getHours();
        if (iHours > 11) {
            iHours -= 12;
        }
        return Math.round((this.dtDate.getHours() * 30) + (this.dtDate.getMinutes() / 2) + (this.dtDate.getSeconds() / 120));
    },
    fGetMinute:     function() {
        return Math.round((this.dtDate.getMinutes() * 6) + (this.dtDate.getSeconds() / 10));
    },
    fInit:          function() {
        this.iHourRotation = this.fGetHour();
        this.fRotate("analoghour", this.iHourRotation);

        this.iMinuteRotation = this.fGetMinute();
        this.fRotate("analogminute", this.iMinuteRotation);

        this.iCurrSecond = this.dtDate.getSeconds();
        this.fRotate("analogsecond", (6 * this.iCurrSecond));
    },
    fRotate:        function(sID, iDeg) {
        var sCSS = ("rotate(" + iDeg + "deg)");
        $("#" + sID).css({ '-moz-transform': sCSS, '-o-transform': sCSS, '-webkit-transform': sCSS });
    },
    fStepSize:     function(iTo, iFrom) {
        var iAnimDiff = (iFrom - iTo);
        if (iAnimDiff > 0) {
            iAnimDiff -= 360;
        }
        return iAnimDiff / this.iStepSize;
    },
    fUpdate:        function() {
        // update time
        this.dtDate = new Date();

        // hours
        var iTemp = this.fGetHour();
        if (this.iHourRotation != iTemp) {
            this.iHourRotation = iTemp;
            this.fRotate("analoghour", iTemp);
        }

        // minutes
        iTemp = this.fGetMinute();
        if (this.iMinuteRotation != iTemp) {
            this.iMinuteRotation = iTemp;
            this.fRotate("analogminute", iTemp);
        }

        // seconds
        if (this.iCurrSecond != this.dtDate.getSeconds()) {
            var iRotateFrom = (6 * this.iCurrSecond);
            this.iCurrSecond = this.dtDate.getSeconds();
            var iRotateTo = (6 * this.iCurrSecond);

            // push steps into array
            var iDiff = this.fStepSize(iRotateTo, iRotateFrom);
            for (var i = 0; i < this.iStepSize; i++) {
                iRotateFrom -= iDiff;
                this.aSecond.push(Math.round(iRotateFrom));
            }
        }
    }
};   ClockInit();

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 * MIT license
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jQuery挂在墙上的钟表

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