- <!DOCTYPE html>
- <html>
- <head>
- <script type="text/javascript">
- function init(){
- clock();
- setInterval(clock,1000);
- }
- function clock(){
- var now = new Date();
- var ctx = document.getElementById('canvas').getContext('2d');
- ctx.save();
- ctx.clearRect(0,0,150,150);
- ctx.translate(75,75);
- ctx.scale(0.4,0.4);
- ctx.rotate(-Math.PI/2);
- ctx.strokeStyle = "black";
- ctx.fillStyle = "white";
- ctx.lineWidth = 8;
- ctx.lineCap = "round";
- // Hour marks
- ctx.save();
- for (var i=0;i<12;i++){
- ctx.beginPath();
- ctx.rotate(Math.PI/6);
- ctx.moveTo(100,0);
- ctx.lineTo(120,0);
- ctx.stroke();
- }
- ctx.restore();
- // Minute marks
- ctx.save();
- ctx.lineWidth = 5;
- for (i=0;i<60;i++){
- if (i%5!=0) {
- ctx.beginPath();
- ctx.moveTo(117,0);
- ctx.lineTo(120,0);
- ctx.stroke();
- }
- ctx.rotate(Math.PI/30);
- }
- ctx.restore();
- var sec = now.getSeconds();
- var min = now.getMinutes();
- var hr = now.getHours();
- hr = hr>=12 ? hr-12 : hr;
- ctx.fillStyle = "black";
- // write Hours
- ctx.save();
- ctx.rotate( hr*(Math.PI/6) + (Math.PI/360)*min + (Math.PI/21600)*sec )
- ctx.lineWidth = 14;
- ctx.beginPath();
- ctx.moveTo(-20,0);
- ctx.lineTo(80,0);
- ctx.stroke();
- ctx.restore();
- // write Minutes
- ctx.save();
- ctx.rotate( (Math.PI/30)*min + (Math.PI/1800)*sec )
- ctx.lineWidth = 10;
- ctx.beginPath();
- ctx.moveTo(-28,0);
- ctx.lineTo(112,0);
- ctx.stroke();
- ctx.restore();
- // Write seconds
- ctx.save();
- ctx.rotate(sec * Math.PI/30);
- ctx.strokeStyle = "#D40000";
- ctx.fillStyle = "#D40000";
- ctx.lineWidth = 6;
- ctx.beginPath();
- ctx.moveTo(-30,0);
- ctx.lineTo(83,0);
- ctx.stroke();
- ctx.beginPath();
- ctx.arc(0,0,10,0,Math.PI*2,true);
- ctx.fill();
- ctx.beginPath();
- ctx.arc(95,0,10,0,Math.PI*2,true);
- ctx.stroke();
- ctx.fillStyle = "#555";
- ctx.arc(0,0,3,0,Math.PI*2,true);
- ctx.fill();
- ctx.restore();
- ctx.beginPath();
- ctx.lineWidth = 14;
- ctx.strokeStyle = '#325FA2';
- ctx.arc(0,0,142,0,Math.PI*2,true);
- ctx.stroke();
- ctx.restore();
- }
- </script>
- </head>
- <body onload="init();">
- <canvas id="canvas" width="150" height="150"></canvas>
- </body>
- </html>
- //该片段来自于http://www.codesnippet.cn/detail/010220132028.html
来源: http://www.codesnippet.cn/detail/010220132028.html