html5写的一个时钟

时间：2021-01-07 11:49:03

看到的一个htmhtml5写的一个时钟l5写的时钟

<!doctype>

<html>

<head>

  <script>

   window.onload=function(){

    var canvas=document.getElementById("myCanvas");

    var c=canvas.getContext("2d");//getContenText  返回一个绘图的环境，其中2d是目前唯一合法的字符  指的是 

    var drawClock=function(){

     c.clearRect(0,0,500,500);//清除画布,

     var now =new Date();

     var sec=now.getSeconds();

     var min=now.getMinutes();

     var hour=now.getHours();

     hour=hour+min/60;

     hour=hour>12?hour-12:hour;//21:36:21 把24小时转12小时制

     //表盘

     c.lineWidth=10;

     c.strokeStyle="blue";

     c.beginPath();

     c.arc(250,250,200,0,360,false);

     c.closePath();

     c.stroke();

     //1.刻度

     //1.1 时刻度

     c.lineWidth=7;

     c.strokeStyle="#000";

     for(var i=0;i<12;i++){

      c.save();

      c.translate(250,250);

      c.rotate(i*30*Math.PI/180);

      c.beginPath();

      c.moveTo(0,-170);

      c.lineTo(0,-190);

      c.closePath();

      c.stroke();

      c.restore();

     }

     //1.2 分刻度

     c.lineWidth=5;

     c.strokeStyle="#000";

     for(var i=0;i<60;i++){

      c.save();

      c.translate(250,250);

      c.rotate(i*6*Math.PI/180);

      c.beginPath();

      c.moveTo(0,-170);

      c.lineTo(0,-180);

      c.closePath();

      c.stroke();

      c.restore();

     }

     //2.1 时针

     c.save();

     c.lineWidth=7;

     c.strokeStyle="#000";

     c.translate(250,250);

     c.rotate(hour*30*Math.PI/180);

     c.beginPath();

     c.moveTo(0,-100);

     c.lineTo(0,10);

     c.closePath();

     c.stroke();

     c.restore();

     //2.2 分针

     c.save();

     c.lineWidth=5;

     c.strokeStyle="#333";

     c.translate(250,250);

     c.rotate( min*6*Math.PI/180);

     c.beginPath();

     c.moveTo(0,-140);

     c.lineTo(0,15);

     c.closePath();

     c.stroke();

     c.restore();

     //2.3 秒针

     c.save();

     c.lineWidth=2;

     c.strokeStyle="red";

     c.translate(250,250);

     c.rotate(sec * 6 *Math.PI/180);

     c.beginPath();

     c.moveTo(0,-160);

     c.lineTo(0,20);

     c.closePath();

     c.stroke();

     //圆心加个圆圈

     c.beginPath();

     c.arc(0,0,5,0,360,false);

     c.closePath();

     c.fillStyle="green";

     c.fill();

     //在秒针前端加个圆点

     c.beginPath();

     c.arc(0,-140,10,0,360,false);

     c.closePath();

     c.fillStyle="red";

     c.fill();

     c.restore();

     //3 盘外时刻数字

     for(var i=1;i<13;i++){

      c.save();

      c.lineWidth=5;

      c.strokeStyle="blue";

      c.font="40px 黑体";

      c.translate(250,250);

      c.rotate(i*30*Math.PI/180);

      c.beginPath();

      c.strokeText(""+i,-20,-210);

      c.closePath();

      c.stroke();

      c.restore();

     }

    }

    drawClock();

    setInterval(drawClock,1000);

   }

  </script>

</head>

<body>

  <canvas width="500" height="500" id="myCanvas" style="background-color:yellow">

     垃圾浏览器不支持canvas标签

  </canvas>

</body>

</html>

效果图

html5写的一个时钟

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