CSS+JS实现一个时钟

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效果如下：

预览链接:(https://shanfeng606.github.io/practice_05/) 点击跳转

HTML代码

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<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
</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(() => {  //定时器，以毫秒周期来调用函数
            let day = new Date();
            let hh = day.getHours() * 30; //一圈12h，每h旋转30度
            let mm = day.getMinutes() * deg;
            let ss = day.getSeconds() * deg;
            hr.style.transform = `rotateZ(${(hh) + (mm / 12)}deg)`;//时针旋转角度还要加分针的旋转分量
            mn.style.transform = `rotateZ(${mm}deg)`;
            sc.style.transform = `rotateZ(${ss}deg)`;
        })

    </script>
</body>
</html>

CSS代码

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*{
    margin: 0;
    padding: 0;
}
body{
    display: flex;
    justify-content: center;
    align-items: center;
    /* vh? */
    min-height: 100vh;/*相对于视口的高度。视口被均分为100单位的vh*/
    background: #091921;
}
.clock{
    width: 350px;
    height:350px;
    display: flex;
    justify-content: center;/*左右居中*/
    align-items: center;  /*上下居中*/
    background: url(fb16d3ee670f310e93be4b7ad845ed8df32a405e.png);
    background-size:cover; /*覆盖整个尺寸*/
    border:4px solid #091921;
    border-radius: 50%;
    /*box-shadow: h-shadow v-shadow blur spread color inset;右下正方向*/
    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(0,0,0,0.3),
                inset 0 15px 15px rgba(0,0,0,0.3);
}
.clock:before{
    content:'';
    position: absolute;
    width: 15px;
    height:15px;
    background:#fff;
    border-radius: 50%;
    z-index:1000;
}

.clock .hour,
.clock .min,
.clock .src
{
    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;
    /* align-items: center; 避免指针居中对齐*/
    position: absolute;
    border-radius:50%;
}
.hr:before{
    content:'';
    position: absolute;
    width: 8px;
    height:80px;
    background:#ff105e;
    border-radius: 6px 6px 0 0;
    z-index:10;
}
.mn:before{
    content:'';
    position: absolute;
    width: 4px;
    height:90px;
    background:#fff;
    border-radius: 6px 6px 0 0;
    z-index:11;
}
.sc:before{
    content:'';
    position: absolute;
    width:2px;
    height:150px;
    background:#fff;
    border-radius: 6px 6px 0 0;/*左上 右上 右下 左下*/
    z-index:12;
}
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