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<!DOCTYPE HTML PUBLIC"-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>Time</title> <script type="text/javascript"> window.onload=function(){ clock(); setInterval(clock,1000);///每一秒钟重新绘制一次 }; function clock(){ ///得到时分秒 var now=new Date(); var sec=now.getSeconds(),min=now.getMinutes(),hour=now.getHours(); hour=hour>=12?hour-12:hour; var c=document.getElementById("myCanvas").getContext("2d"); c.save(); c.clearRect(0,0,150,150); ///初始化画布 c.translate(75,75); c.scale(0.4,0.4); c.rotate(-Math.PI/2); c.strokeStyle="black"; c.fillStyle="black"; c.lineWidth=8; c.lineCap="round"; c.save(); c.strokeStyle="#330066"; c.beginPath(); for(var i=0;i<12;i++){///小时刻度 c.rotate(Math.PI/6); c.moveTo(100,0); c.lineTo(120,0); } c.stroke(); c.restore(); c.save(); c.lineWidth=5; c.beginPath(); for(var i=0;i<60;i++){///分钟刻度 if(i%5!=0){ c.moveTo(117,0); c.lineTo(120,0); } c.rotate(Math.PI/30); } c.stroke(); c.restore(); c.save(); c.rotate((Math.PI/6)*hour+(Math.PI/360)*min+(Math.PI/21600)*sec);///画上时针 c.lineWidth=12; c.strokeStyle="black"; c.beginPath(); c.moveTo(-20,0); c.lineTo(75,0); c.stroke(); c.restore(); c.save(); c.rotate((Math.PI/30)*min+(Math.PI/1800)*sec);///分针 c.strokeStyle="#29A8DE"; c.lineWith=10; c.beginPath(); c.moveTo(-28,0); c.lineTo(102,0); c.stroke(); c.restore(); c.save(); c.rotate(sec*Math.PI/30);///秒针 c.strokeStyle="#D40000"; c.lineWidth=6; c.beginPath(); c.moveTo(-30,0); c.lineTo(83,0); c.stroke(); c.restore(); c.save(); ///表框 c.lineWidth=14; c.strokeStyle="#325FA2"; c.beginPath(); c.arc(0,0,142,0,Math.PI*2,true); c.stroke(); c.restore(); c.restore(); } </script> </head> <body> <canvas id="myCanvas" width="200" height="200" ></canvas> </body> </html>
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原文地址：http://www.cnblogs.com/kuangxiangnice/p/4302789.html
