本文实例为大家分享了JS CSS实现动态时钟的具体代码，供大家参考，具体内容如下
知识点总结：
document.querySelector（）方法返回文档中匹配指定 CSS 选择器的一个元素。
setInterval() 方法可按照指定的周期（以毫秒计）来调用函数或计算表达式。
setInterval() 方法会不停地调用函数，直到 clearInterval() 被调用或窗口被关闭。由 setInterval() 返回的 ID 值可用作 clearInterval() 方法的参数。
HTML js部分
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<link rel="stylesheet" href="shiying.css" >
<title>Document</title>
</head>
<body>
<div class="clock">
<div class="hour">
<div class="hr" id="hr"></div>
</div>
<div class="min">
<div class="mn" id="mn"></div>
</div>
<div class="sec">
<div class="sc" id="sc"></div>
</div>
</div>
<script type="text/javascript">
const deg = 6;
const hr = document.querySelector('#hr');
const mn = document.querySelector('#mn');
const sc = document.querySelector('#sc');
setInterval(() => {
let day = new Date();
let hh = day.getHours() * 30;
let mm = day.getMinutes() * deg;
let ss = day.getSeconds() * deg;
hr.style.transform = `rotateZ(${(hh) (mm / 12)}deg)`;
mn.style.transform = `rotateZ(${mm}deg)`;
sc.style.transform = `rotateZ(${ss}deg)`;
})
</script>
</body>
</html>
CSS部分
*{
margin:0;
padding:0;
box-sizing: border-box;
}
body{
display: flex;
justify-content: center;
align-items: center;
min-height: 100vh;
background: #091921;
}
.clock{
width: 350px;
height: 350px;
display:flex;
justify-content: center;
align-items: center;
background: url(1613462007944.png);
background-size: cover;
border:4px solid #091921;
border-radius: 50%;
box-shadow: 0 -15px 15px rgba(255,255,255,0.05),
inset 0 -15px 15px rgba(255,255,255, 0.05),
0 -15px 15px rgba(0,0,0,0.05),
inset 0 -15px 15px rgba(0,0,0, 0.05);
}
.clock:before
{
content:"";
position: absolute;
width: 15px;
height: 15px;
background: #fff;
border-radius: 50%;
z-index:10000;
}
.clock .hour,
.clock .min,
.clock .sec
{
position: absolute;
}
.clock .hour, .hr{
width: 160px;
height: 160px;
}
.clock .min, .mn{
width: 190px;
height: 190px;
}
.clock .sec, .sc{
width: 230px;
height: 230px;
}
.hr, .mn, .sc{
display: flex;
justify-content: center;
position: absolute;
border-radius: 50%;
}
.hr:before{
content:"";
position: absolute;
width: 8px;
height: 80px;
background: #ff105e;
z-index: 10;
border-radius: 6px 6px 0 0;
}
.mn:before{
content:"";
position: absolute;
width: 4px;
height: 90px;
background: #fff;
z-index: 11;
border-radius: 6px 6px 0 0;
}
.sc:before{
content:"";
position: absolute;
width: 4px;
height: 150px;
background: #fff;
z-index:12;
border-radius: 6px 6px 0 0;
}
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持Devmax。