JavaScript Canvas编写炫彩的网页时钟
进阶的JFarmer 人气:0本文实例为大家分享了JavaScript Canvas编写炫彩网页时钟的具体代码，供大家参考，具体内容如下
只是利用了Canvas制作的。
示意图如下：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv = "Content-Type" content = "text/html"; charsert = "utf-8" />
<title> 网页时钟 </title>
</head>
<body>
<h2> Web时钟 </h2>
<canvas id = "hello" width = "400" height = "400"
style = "border:1px solid black"> </canvas>
<script languagetype = "text/javascript">
var myCavas = document.getElementById('hello');
var c = myCavas.getContext('2d');
function clock() {
c.clearRect(0, 0, 400, 400);
//获取当前时间
var data = new Date();
//获取秒
var sec = data.getSeconds();
//获取分钟
var min = data.getMinutes();
//获取小时
var hour = data.getHours();
c.save();
c.translate(200, 200);
c.rotate(-Math.PI/2);
//分针刻度线
for (var i = 0; i < 60; i++) { //画60个刻度线
c.beginPath();
c.strokeStyle = "yellowgreen";
c.lineWidth = 5;
c.moveTo(117, 0);
c.lineTo(120, 0);
c.stroke();
//每6deg画一个分钟刻度线
c.rotate(Math.PI/30);
c.closePath();
}
//时钟刻度线
for (var i = 0; i < 12; i++) { //画60个刻度线
c.beginPath();
c.strokeStyle = "green";
c.lineWidth = 8;
c.moveTo(100, 0);
c.lineTo(120, 0);
c.stroke();
//每6deg画一个分钟刻度线
c.rotate(Math.PI/6);
c.closePath();
}
//外表盘
c.beginPath();
c.strokeStyle = "pink";
c.arc(0, 0, 145, 0, Math.PI*2);
c.lineWidth = 12;
c.stroke();
c.closePath();
//画时针
hour = hour > 12 ? hour-12 : hour;
//console.log(hour);
c.beginPath();
c.save();
//设置旋转角度，参数是弧度，角度0-360 弧度角度*Math.PI/180
c.rotate(Math.PI/6*hour + Math.PI/6*min/60 + Math.PI/6*sec/3600);
c.strokeStyle = "yellowgreen";
c.lineWidth = 4;
c.moveTo(-20, 0);
c.lineTo(50, 0);
c.stroke();
c.restore();
c.closePath();
//画分针
//console.log(min);
c.beginPath();
c.save();
c.rotate(Math.PI/30*min + Math.PI/30*sec/60);
c.strokeStyle = "springgreen";
c.lineWidth = 3;
c.moveTo(-30, 0);
c.lineTo(70, 0);
c.stroke();
c.restore();
c.closePath();
//画秒针
c.beginPath();
c.save();
c.rotate(Math.PI/30*sec);
c.strokeStyle = "red";
c.lineWidth = 2;
c.moveTo(-40, 0);
c.lineTo(120, 0);
c.stroke();
c.restore();
c.closePath();
c.restore();
}
clock();
setInterval(clock, 1000);
</script>
</body>
</html>
更多JavaScript时钟特效点击查看：JavaScript时钟特效专题
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