Posted in Javascript onAugust 30, 2018
本文实例讲述了原生JS实现的简单小钟表功能。分享给大家供大家参考，具体如下：
先来看看运行效果：
完整代码：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>3water.com 钟表</title>
<style type="text/css">
body {
background-color:#00A2D4;
}
.clock {
width: 200px;
height: 200px;
background: -webkit-radial-gradient(#3b3b3b, #000);
background: radial-gradient(#2E3F50, #0E1B29);
box-shadow: inset 0px 0px 30px #131313, 0px 2px 18px rgba(0,0,0,0.5);
border: 6px solid #172839;
border-radius: 106px;
margin: auto;
position: absolute;
top: 0; bottom: 0; left: 0; right: 0;
}
.hour-hand {
width: 4px;
height: 55px;
background: #fff;
box-shadow: 0px 0px 7px #000;
position: absolute;
top: 45px;
left: 98px;
}
.minute-hand {
width: 4px;
height: 80px;
background: #fff;
box-shadow: 0px 0px 4px #000;
position: absolute;
top: 20px;
left: 98px;
}
.second-hand {
width: 2px;
height: 80px;
background: #bbb;
box-shadow: 0px 0px 7px #000;
position: absolute;
top: 20px;
left: 99px;
}
.pin {
width: 10px;
height: 10px;
background: #222;
border-radius: 10px;
margin: auto;
position: absolute;
top: 0; bottom: 0; left: 0; right: 0;
}
.hour-hand,
.minute-hand,
.second-hand {
-webkit-transform-origin: 50% 100%;
-moz-transform-origin: 50% 100%;
-o-transform-origin: 50% 100%;
-ms-transform-origin: 50% 100%;
transform-origin: 50% 100%;
}
.circle{
width:20px;
height:20px;
line-height:20px;
text-align:center;
color:#fff;
position: absolute;
}
</style>
</head>
<body>
<div class="clock">
<div class="minute-hand"></div>
<div class="hour-hand"></div>
<div class="second-hand"></div>
<div class="pin"></div>
<div class="circle">6</div>
<div class="circle">5</div>
<div class="circle">4</div>
<div class="circle">3</div>
<div class="circle">2</div>
<div class="circle">1</div>
<div class="circle">12</div>
<div class="circle">11</div>
<div class="circle">10</div>
<div class="circle">9</div>
<div class="circle">8</div>
<div class="circle">7</div>
</div>
<div class="time"></div>
<script type="text/javascript">
window.onload=function(){
setInterval(function(){
var dt = new Date();
var sec_deg = dt.getSeconds() * (360/60);
var min_deg = dt.getMinutes() * (360/60);
var hr_deg = dt.getHours() * (360/12) + dt.getMinutes() * (360/60/12);
document.querySelector(".clock .second-hand").style.cssText='-webkit-transform:rotate(' + sec_deg + 'deg)','-moz-transform:rotate(' + sec_deg + 'deg)', '-o-transform:rotate(' + sec_deg + 'deg)', '-ms-transform:rotate(' + sec_deg + 'deg)', 'transform:rotate(' + sec_deg + 'deg)';
document.querySelector('.clock .minute-hand').style.cssText='-webkit-transform:rotate(' + min_deg + 'deg)', '-moz-transform:rotate(' + min_deg + 'deg)', '-o-transform:rotate(' + min_deg + 'deg)', '-ms-transform:rotate(' + min_deg + 'deg)', 'transform:rotate(' + min_deg + 'deg)';
document.querySelector('.clock .hour-hand').style.cssText='-webkit-transform:rotate(' + hr_deg + 'deg)', '-moz-transform:rotate(' + hr_deg + 'deg)', '-o-transform:rotate(' + hr_deg + 'deg)', '-ms-transform:rotate(' + hr_deg + 'deg)', 'transform:rotate(' + hr_deg + 'deg)';
}, 1000);
var dx=90,
dy=90,
s=87,//半径
x=Math.sin(0),
y=Math.cos(0),
dig=2*Math.PI/12;
var circle=document.querySelectorAll(".circle");
for(var i=0;i<12;i++){
var x=Math.sin(i*dig);
var y=Math.cos(i*dig);
var topValue=Number(dy+y*s),
leftValue=Number(dx+x*s);
circle[i].style.top=topValue+"px";
circle[i].style.left=leftValue+"px";
}
}
</script>
</body>
</html>
感兴趣的朋友可使用在线HTML/CSS/JavaScript代码运行工具：http://tools.3water.com/code/HtmlJsRun测试一下运行效果。
原生JS实现的简单小钟表功能示例
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邹大叔声明：登载此文出于传递更多信息之目的，并不意味着赞同其观点或证实其描述。
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