<!doctype html>
 <html>
 <head>
 <meta charset="utf-8">
 <title>canvas绘图小实例之方块移动</title>
 <style>
 body{ background:#000;}
 #canvas1{ margin:100px 500px; background:#fff;}
 #canvas1 span{ color:#fff;}
 </style>
 <script>
 window.onload = function(){
     var oCanvas = document.getElementById('canvas1');
     var oContext = oCanvas.getContext('2d');    //获取绘图的2d环境

     function tick(){
         oContext.clearRect(0,0,oCanvas.width,oCanvas.height);
        　　　　　　//画表盘
         oContext.beginPath();
         for(var i=0;i<60;i++){
             oContext.moveTo(300,300);
             oContext.arc(300,300,200,i*6*Math.PI/180,(i+1)*6*Math.PI/180,false);
         }
         oContext.stroke();

         oContext.beginPath();
         oContext.arc(300,300,200*0.9,0,360*Math.PI/180,false);
         oContext.fillStyle= "white";
         oContext.fill();

         oContext.beginPath();
         for(var i=0;i<12;i++){
             oContext.moveTo(300,300);
             oContext.arc(300,300,200,i*30*Math.PI/180,(i+1)*30*Math.PI/180,false);
         }
         oContext.lineWidth = 3;
         oContext.stroke();

         oContext.beginPath();
         oContext.arc(300,300,200*0.87,0,360*Math.PI/180,false);
         oContext.fill();

         //获取时间
         var oDate = new Date();
         var oHour = oDate.getHours();
         var oMin = oDate.getMinutes();
         var oSec = oDate.getSeconds();

         var degHour = (-90+oHour*30+oMin/2)*Math.PI/180;
         var degMin = (-90+oMin*6)*Math.PI/180;
         var degSec = (-90+oSec*6)*Math.PI/180;
     　　　　　　　　 //画时针
         oContext.beginPath();
         oContext.moveTo(300,300);
         oContext.arc(300,300,200*0.5,degHour,degHour,false);
         oContext.lineWidth = 5;
         oContext.stroke();
         //画分针
         oContext.beginPath();
         oContext.moveTo(300,300);
         oContext.arc(300,300,200*0.7,degMin,degMin,false);
         oContext.lineWidth = 3;
         oContext.stroke();
         //画秒针
         oContext.beginPath();
         oContext.moveTo(300,300);
         oContext.arc(300,300,200*0.8,degSec,degSec,false);
         oContext.lineWidth = 1;
         oContext.stroke();
     }

     tick();
     setInterval(tick,1000);

 }
 </script>
 </head>

 <body>
 <canvas id="canvas1" width="600" height="600">
     <span>该浏览器不支持canvas</span>
 </canvas>
 </body>
 </html>

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