代码如下：
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>canvas画钟表</title> <style> body{ background: #fc0; } #canvas1{ background: #fff; } </style> </head> <body> <canvas></canvas> <script> var oC=document.getElementById('canvas1'); var oGC=oC.getContext('2d'); function toDraw(){ var x=200; var y=200; var r=150; oGC.clearRect(0,0,oC.width,oC.height); var oDate=new Date(); var oHour=oDate.getHours(); var oMinu=oDate.getMinutes(); var oSec=oDate.getSeconds(); var hVal=(-90+oHour*30+oMinu/2)*Math.PI/180; var mVal=(-90+oMinu*6)*Math.PI/180; var sVal=(-90+oSec*6)*Math.PI/180; oGC.beginPath(); for(i=0;i<60;i++){ oGC.moveTo(x,y); oGC.arc(x,y,r,6*i*Math.PI/180,6*(i+1)*Math.PI/180,false); } oGC.closePath(); oGC.stroke(); oGC.fillStyle='#fff'; oGC.beginPath(); oGC.moveTo(x,y); oGC.arc(x,y,r*19/20,0,360*Math.PI/180,false); oGC.closePath(); oGC.fill(); oGC.lineWidth=3; oGC.beginPath(); for(i=0;i<12;i++){ oGC.moveTo(x,y); oGC.arc(x,y,r,30*i*Math.PI/180,30*(i+1)*Math.PI/180,false); } oGC.closePath(); oGC.stroke(); oGC.fillStyle='#fff'; oGC.beginPath(); oGC.moveTo(x,y); oGC.arc(x,y,r*18/20,0,360*Math.PI/180,false); oGC.closePath(); oGC.fill(); oGC.lineWidth=5; oGC.beginPath(); oGC.moveTo(x,y); oGC.arc(x,y,r*10/20,hVal,hVal,false); oGC.closePath(); oGC.stroke(); oGC.lineWidth=3; oGC.beginPath(); oGC.moveTo(x,y); oGC.arc(x,y,r*14/20,mVal,mVal,false); oGC.closePath(); oGC.stroke(); oGC.lineWidth=1; oGC.beginPath(); oGC.moveTo(x,y); oGC.arc(x,y,r*17/20,sVal,sVal,false); oGC.closePath(); oGC.stroke(); } setInterval(toDraw,1000); toDraw(); </script> </body> </html>