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="https://www.jb51.net/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(); }