JS html时钟制作代码分享

2019-11-19 17:19:44

字体：大中小

来源：转载

供稿：网友

时钟效果图：

闲来无聊做了一个网页的时钟，效果模拟传统时钟的运行方式，

运用了html 的画布实现指针，背景图片引用了网络图片。

具体原理：

首先将时钟分为四个不同区域，对每个区域计算cos，sin 来确实指针顶点位置。在通过画布来绘画出指针。
通过setInterval 每秒刷新指针位置实现传统机械表针的动态跳动。

本人是JS开发程序员，从业1年多。闲来无聊的简单页面，

欢迎大家提问，或者建议。共同进步

代码部分，直接复制HTML 文件中即可查看效果：

<!DOCTYPE html><html><head>  <meta charset=utf-8>  <title>clock</title></head><body style="color:green; <!--background-image:url('http://image.lxway.com/upload/b/f0/bf0d97dcee487096548e6edbc89d4963_thumb.png');--> background-size:100%; background-repeat: no-repeat; background-attachment:fixed">  <div style="width: 900px; height: 900px; margin-top: 50px; margin-left: 50px;">    <div style="position: absolute; left:119px;top: 193px; width: 900px; height: 900px; background-image:url('http://image.lxway.com/upload/b/f0/bf0d97dcee487096548e6edbc89d4963_thumb.png'); background-repeat: no-repeat; z-index: -1;">    </div>    <canvas id="t" width="800" height="800"></canvas>    <div style="position: absolute; left:118px;top: 464px; width: 100px; height: 200px; background-color: white; background-repeat: no-repeat; z-index: 10;">    </div>  </div>  <script language="javascript">        var s = setInterval(moveI, 1000);        function moveI() {          var c = document.getElementById("t");          var pc = c.getContext("2d");          c.height = c.height;          //秒          pc.lineWidth = 3;          pc.strokeStyle = 'rgba(255,0,0,0.8)';          var now = new Date();          var sindex = getxy(150, now.getSeconds());          pc.moveTo(400, 400);          pc.lineTo(sindex.x, sindex.y);          pc.stroke();          pc.beginPath();          //分          pc.lineWidth = 7;          pc.strokeStyle = 'rgba(50,50,50,0.8)';          var mindex = getxy(120, now.getMinutes() + (now.getSeconds() / 60));          pc.moveTo(400, 400);          pc.lineTo(mindex.x, mindex.y);          pc.stroke();          pc.beginPath();          //时          pc.lineWidth = 10;          pc.strokeStyle = 'rgba(0,0,0,0.8)';          var hindex = getxy(80, ((now.getHours() > 12 ? now.getHours() - 12 : now.getHours()) + (now.getMinutes() / 60)) * 5);          pc.moveTo(400, 400);          pc.lineTo(hindex.x, hindex.y);          pc.stroke();        };        function getxy(r, t) {          //计算分区 0,1,2,3          var a = parseInt(t / 15);          //分区角度          t = t - 15 * a;          var y;          var x;          //基于分区的坐标计算          switch (a) {            case 0:              y = r - (r * Math.cos(2 * Math.PI / 360 * 90 * (t / 15)));              x = r + (r * Math.sin(2 * Math.PI / 360 * 90 * (t / 15)));              break;            case 1:              y = r + (r * Math.sin(2 * Math.PI / 360 * 90 * (t / 15)));              x = r + (r * Math.cos(2 * Math.PI / 360 * 90 * (t / 15)));              break;            case 2:              y = r + (r * Math.cos(2 * Math.PI / 360 * 90 * (t / 15)));              x = r - (r * Math.sin(2 * Math.PI / 360 * 90 * (t / 15)));              break;            case 3:              y = r - (r * Math.sin(2 * Math.PI / 360 * 90 * (t / 15)));              x = r - (r * Math.cos(2 * Math.PI / 360 * 90 * (t / 15)));              break;            default:              break;          }          y = (400 - r) + y;          x = (400 - r) + x;          return {            'x': x,            'y': y          };        };  </script></body></html>

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