canvas,时钟效果图： 
图（1） 
图（2） 代码如下： <!doctype html><html><head> <meta charset="UTF-8"> <title>Title</title><style>*{margin:0; padding:0;}body{ background:#000; text-align:center;}canvas{ background:#fff;}</style><script>function toDou(iNum){ return iNum<10?'0'+iNum:''+iNum;}function d2a(n){ return n*Math.PI/180;}window.onload = function(){ var oC = document.getElementById('c1'); var gd = oC.getContext('2d'); var cx = oC.width/2, cy = oC.height/2; function clock(){ gd.clearRect(0,0,oC.width,oC.height); var oDate = new Date(); var H = oDate.getHours()%12; var M = oDate.getMinutes(); var S = oDate.getSeconds(); var MS = oDate.getMilliseconds(); drawArc(60,0,(H*30+M/60*30),'orange'); drawArc(80,0,(M*6+S/60*6),'purple'); drawArc(100,0,(S*6+MS/1000*6),'aqua'); var str = toDou(H)+':'+toDou(M)+':'+toDou(S); gd.font = '20px 微软雅黑'; gd.textAlign = 'center'; gd.textBaseline = 'middle'; gd.fillText(str,cx,cy); } clock() setInterval(clock,1); function drawArc(r,s,e,color){ color = color||'black'; gd.beginPath(); gd.arc(cx,cy,r,d2a(s-90),d2a(e-90),false); gd.strokeStyle = color; gd.lineWidth = 20; gd.stroke(); }};</script></head><body> <canvas id="c1" width="800" height="600"></canvas></body></html>以上就是本文的全部内容，希望本文的内容对大家的学习或者工作能带来一定的帮助，同时也希望多多支持51zixue.net！
canvas,时钟
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