【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：
【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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