HTML5小时钟

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8">

<meta http-equiv="X-UA-Compatible" content="IE=edge,chrome=1">

<title>Examples</title>

<meta name="description" content="">

<meta name="keywords" content="">

<link href="" rel="stylesheet">

<style>

    canvas{

        background: #eee;

    }

</style>

<script>

    window.onload=function(){

        var con=document.getElementById('con');

        var oCanvas=con.getContext("2d");

        var startX=200;

        var startY=200;

        var radius=100;

        setInterval(function(){

            oCanvas.clearRect(0, 0, 400, 400);

            // 阴影

            oCanvas.shadowColor="#888";

            oCanvas.shadowOffsetX=1;

            oCanvas.shadowOffsetY=1;

            oCanvas.shadowBlur=3;

            // 渐变

            var grd=oCanvas.createRadialGradient(startX, startY,1, startX, startY,100);

            grd.addColorStop(0, '#efefef');

            grd.addColorStop(1, "#cecece");

            oCanvas.fillStyle=grd;

            oCanvas.lineWidth=5;

            oCanvas.beginPath();

            oCanvas.strokeStyle="#a34";

            oCanvas.arc(startX, startY, radius, 0, 2*Math.PI);

            oCanvas.stroke();

            oCanvas.fill();

            // 去掉阴影

            oCanvas.shadowColor="#888";

            oCanvas.shadowOffsetX=0;

            oCanvas.shadowOffsetY=0;

            oCanvas.shadowBlur=0;

            // 画刻度

            dragMark();

            var myDate=new Date();

            var H=myDate.getHours()*30+myDate.getMinutes()/2-90;

            var M=myDate.getMinutes()*6-90;

            var S=myDate.getSeconds()*6-90;

            // 时针

            dragT("#000",4,55,H);

            // 分针

            dragT("#888",3,65,M);

            // 秒针

            dragT("#f10",2,80,S);

            // 画中心点

            oCanvas.beginPath();

            oCanvas.fillStyle="#ccc";

            oCanvas.arc(200, 200, 6, 0, 2*Math.PI);

            oCanvas.fill();

        }, 1000);

        function dragT(color,lw,radius,angle){

            oCanvas.beginPath();

            oCanvas.strokeStyle=color;

            oCanvas.lineWidth=lw;

            oCanvas.moveTo(startX, startY);

            oCanvas.lineTo(startX+radius*Math.cos(angle*Math.PI/180), startY+radius*Math.sin(angle*Math.PI/180));

            oCanvas.stroke();

        }

        function dragMark(){

            for(var i = 0; i < 60; i++) {

                var lw=2;

                var radius1=radius-5;

                var angle=i*6*Math.PI/180;

                oCanvas.strokeStyle="#888";

                if (i%5==0) {

                    radius1=radius-8;

                    lw=3;

                    oCanvas.strokeStyle="#666";

                };

                // if(i%15==0){

                //     var s=(i*6-90)*Math.PI/180;

                //     oCanvas.fillStyle="#000"

                //     oCanvas.fillText(i/5, startX+(radius-15)*Math.cos(s), startY+(radius-15)*Math.sin(s));

                // }

                oCanvas.lineWidth=lw;

                oCanvas.beginPath();

                oCanvas.moveTo(startX+radius*Math.cos(angle), startY+radius*Math.sin(angle));

                oCanvas.lineTo(startX+radius1*Math.cos(angle), startY+radius1*Math.sin(angle));

                oCanvas.stroke();

            };

        }

    }

</script>

</head>

<body>

    <canvas width="400" height="400" id="con"></canvas>

</body>

</html>
效果图~
HTML5小时钟
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