利用JavaScript实现网页时钟,效果如下图所示:

首先在body中完成表盘、指针的资源载入:

 <div><img src="../../image/clockface.jpg" alt=""></div> <hr id="hour" > <hr id="min"> <hr id="second">

设置CSS样式:

 <style> body{ margin: 0; } div{ margin: 0 auto; width: 600px; height: 600px; } #hour{ background-color: black; width: 130px; height: 10px; position: fixed; top: 295px; left: 50%; margin-left: -65px; } #min{ background-color: red; width: 200px; height: 8px; position: fixed; top: 296px; left: 50%; margin-left: -100px; } #second{ background-color: yellow; width: 270px; height: 5px; position: fixed; top: 297.5px; left: 50%; margin-left: -135px; } </style>

最后是JS代码部分,使用循环定时器setInterval()每秒调用一次主函数,主函数内使用new Date()创建时间对象,分别使用 .getHours();.getMinutes();.getSeconds()获得当前的时分秒,然后利用CSS自带动画-旋转改变指针的角度:

 setInterval(watch,1000); var anjleSeconds=0,anjleMin=0,anjleHours=0; function watch() { var Time= new Date(); anjleSeconds=Time.getSeconds()/60*360+90; anjleMin=Time.getMinutes()/60*360+90; anjleHours=nowHours/12*360+90; document.getElementById("second").style.transform="rotate("+anjleSeconds+"deg)"; document.getElementById("min").style.transform="rotate("+anjleMin+"deg)"; document.getElementById("hour").style.transform="rotate("+anjleHours+"deg)"; } 

完整代码如下:

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        body{
            margin: 0;
        }
        div{
            margin: 0 auto;
            width: 600px;
            height: 600px;
        }
        #hour{
            background-color: black;
            width: 130px;
            height: 10px;
            position: fixed;
            top: 295px;
            left: 50%;
            margin-left: -65px;
        }
        #min{
            background-color: red;
            width: 200px;
            height: 8px;
            position: fixed;
            top: 296px;
            left: 50%;
            margin-left: -100px;
        }
        #second{
            background-color: yellow;
            width: 270px;
            height: 5px;
            position: fixed;
            top: 297.5px;
            left: 50%;
            margin-left: -135px;
        }
    </style>
</head>
<body>
<div><img src="../../image/clockface.jpg" alt=""></div>
<hr id="hour" >
<hr id="min">
<hr id="second">
<script>
    setInterval(watch,1000);
    var anjleSeconds=0,anjleMin=0,anjleHours=0;
    function watch() {
        var Time= new Date();
        anjleSeconds=Time.getSeconds()/60*360+90;
        anjleMin=Time.getMinutes()/60*360+90;
        anjleHours=Time.getHours()/12*360+90;
        document.getElementById("second").style.transform="rotate("+anjleSeconds+"deg)";
        document.getElementById("min").style.transform="rotate("+anjleMin+"deg)";
        document.getElementById("hour").style.transform="rotate("+anjleHours+"deg)";
    }
</script>
</body>
</html>

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