用JavaScript+Canvas来实现最简单的时钟效果，供大家参考，具体内容如下
效果图：
先看html代码：
<html> <head> <meta charset="UTF-8"> <title></title> <script type="text/javascript" src="js/demo3.js" ></script> </head> <body> <canvas id = "canvas"></canvas> </body> </html>
JavaScript代码：
var canvas,context;
function draw(){//定义划时钟的方法
var data = new Date();
var hHoure = data.getHours();
var mMin = data.getMinutes();
var sSec = data.getSeconds();
var hValue = (hHoure*30+mMin/2-90)*Math.PI/180;
var mValue = (mMin*6-90)*Math.PI/180;
var sValue = (sSec*6 -90)*Math.PI/180;
var x = 200,y = 200,r = 150;
context.clearRect(0,0,canvas.width,canvas.height);
context.moveTo(x,y);
context.arc(x,y,r,0,6*Math.PI/180,false);
//
context.beginPath();
context.lineWidth = 1;
for(var i = 0;i<60;i++){
context.moveTo(x,y);
context.arc(x,y,r,6*i*Math.PI/180,6*(i+1)*Math.PI/180,false);
}
context.closePath();
context.stroke();
//
context.beginPath();
context.fillStyle = "white";
context.moveTo(x,y);
context.arc(x,y,r/1.1,-0,2*Math.PI,false);
context.closePath();
context.fill();
//
context.beginPath();
context.lineWidth = 3;
for(var i = 0;i<12;i++){
context.moveTo(x,y);
context.arc(x,y,r,30*i*Math.PI/180,30*(i+1)*Math.PI,false);
}
context.closePath();
context.stroke();
//
context.beginPath();
context.fillStyle = "white";
context.moveTo(x,y);
context.arc(x,y,r/1.12,0,2*Math.PI,false);
context.closePath();
context.fill();
context.beginPath();
context.fillStyle = "black";
context.moveTo(x,y);
context.arc(x,y,r/30,0,2*Math.PI,false);
context.fill();
//
context.beginPath();
context.lineWidth = 5;
context.moveTo(x,y);
context.arc(x,y,r/2.5,hValue,hValue,false);
context.stroke();
//
context.beginPath();
context.lineWidth = 3;
context.moveTo(x,y);
context.arc(x,y,r/2,mValue,mValue,false);
context.stroke();
//
context.beginPath();
context.lineWidth = 2;
context.moveTo(x,y);
context.arc(x,y,r/1.6,sValue,sValue,false);
context.stroke();
}
window.onload = function(){
canvas = document.getElementById('canvas');
context = canvas.getContext('2d');
canvas.height = 500;
canvas.width = 500;
setInterval(draw,1000);
draw();
}
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