纯js+css实现在线时钟

本文实例为大家分享了js+css实现在线时钟的具体代码，供大家参考，具体内容如下

<!DOCTYPE html>
<html>
 <head>
 <meta charset="utf-8">
 <title>时钟</title>
 <style type="text/css">
 *{
 padding: 0;
 margin: 0;
 }
 .wrap{
 position: absolute;
 width: 200px;
 height: 200px;
 border: 2px solid;
 background-color: pink;
 border-radius: 50%;
 left: 50%;
 top: 50%;
 transform: translate(-50%,-50%);
 }
 .wrap>ul{
 list-style: none;
 }
 .wrap>ul>li{
 position: absolute;
 left: 99px;
 top: 0;
 width: 2px;
 height: 10px;
 background-color: black;
 transform-origin: center 100px;
 }
 .wrap>ul>li:nth-child(5n+1){
 height: 15px;
 }
 .wrap > .hour{
 position: absolute;
 left: 97px;
 top:70px ;
 width: 6px;
 height: 30px;
 background: black;
 transform-origin: center bottom;
 }
 .wrap > .min{
 position: absolute;
 left: 98px;
 top: 50px;
 width: 4px;
 height: 50px;
 background: gray;
 transform-origin: center bottom;
 }
 .wrap > .sec{
 position: absolute;
 left: 99px;
 top: 30px;
 width: 2px;
 height: 70px;
 background: red;
 transform-origin: center bottom;
 }
 .wrap > .center{
 position: absolute;
 left: 90px;
 top: 90px;
 width: 20px;
 height: 20px;
 border-radius:50% ;
 background: black;
 }
 </style>
 </head>
 <body>
 <div class="wrap">
 <ul></ul>
 <div class="hour"></div>
 <div class="min"></div>
 <div class="sec"></div>
 <div class="center"></div>
 </div>
 </body>
 <script type="text/javascript">
 window.onload =function(){
 var hourNode =document.querySelector(".wrap > .hour");
 var minNode =document.querySelector(".wrap > .min");
 var secNode =document.querySelector(".wrap > .sec");
 var ulNode =document.querySelector(".wrap>ul");
 var styleNode =document.createElement('style');
 var liHtml ='';
 var styleHtml ='';
 for(var i=0;i<60;i++){
 liHtml += "<li></li>";
 styleHtml+=".wrap>ul>li:nth-child("+(i+1)+"){transform: rotate("+(i*6)+"deg);}"
 }
 ulNode.innerHTML =liHtml;
 styleNode.innerHTML =styleHtml;
 document.querySelector('head').appendChild(styleNode);

 moveTime();
 setInterval(moveTime,1000);

 function moveTime(){
 var date =new Date();
 var sec =date.getSeconds();
 var min =date.getMinutes()+sec/60;
 var hour =date.getHours()+min/60;
 hourNode.style.transform ="rotate("+(hour*30)+"deg)";
 minNode.style.transform ="rotate("+(min*6)+"deg)";
 secNode.style.transform ="rotate("+(sec*6)+"deg)";
 }

 }
 </script>
</html>

实现要点

1、transform-origin的基本点的应用
2、批量处理html和样式的信息
3、指证位置进行了优化（时针与小时和分针位置有关，分针与分和秒针位置有关）。

新增居中方式：

开启绝对定位 left:50%;top :50%;transform:translate(50%,50%);

更多JavaScript时钟特效点击查看：JavaScript时钟特效专题

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我们。