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<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<title></title>
</head>
<body>
<canvas id="clock" width="400" height="400"></canvas>
<script src="../js/jquery-1.9.0.js"></script>
<script type="text/javascript">
function canvasClock(id) {
var canvas = document.getElementById(id);
var context = canvas.getContext("2d");
context.clearRect(0, 0, 400, 400);
//绘制圆
context.strokeStyle = "purple";
context.beginPath();
context.arc(150, 150, 100, 0, Math.PI * 2, true);
context.closePath();
context.stroke();
//绘制分钟刻度
for (var i = 0; i < 60; i++) {
if (i % 5 == 0) {
continue;
}
context.save();
context.lineWidth = 1;
context.strokeStyle = "#000";
context.translate(150, 150);
context.rotate(i * 6 * Math.PI / 180);
context.beginPath();
context.moveTo(0, -100);
context.lineTo(0,-90);
context.closePath();
context.stroke();
context.restore();
};
//绘制时钟刻度
for (var i = 0; i < 12; i++) {
context.save();
context.lineWidth = 2;
context.strokeStyle = "#000";
context.translate(150, 150);
context.rotate(i * 30 * Math.PI / 180);
context.beginPath();
context.moveTo(0, -100);
context.lineTo(0, -85);
context.closePath();
context.stroke();
context.restore();
};
var date = new Date();
var hour = date.getHours();
var minutes = date.getMinutes();
var sec = date.getSeconds();
hour = hour + minutes / 60;
hour = hour > 12 ? hour - 12 : hour;
//时钟线
context.save();
context.lineWidth = 5;
context.strokeStyle = "#4cff00";
context.translate(150, 150);
context.rotate(hour * 30 * Math.PI / 180);
context.beginPath();
context.moveTo(0,-70);
context.lineTo(0, 10);
context.closePath();
context.stroke();
context.restore();
//分钟线
context.save();
context.lineWidth = 3;
context.strokeStyle = "#b200ff";
context.translate(150, 150);
context.rotate(minutes * 6 * Math.PI / 180);
context.beginPath();
context.moveTo(0, -80);
context.lineTo(0, 10);
context.closePath();
context.stroke();
context.restore();
//秒钟线
context.save();
context.lineWidth = 1.5;
context.strokeStyle = "#ff00dc";
context.translate(150, 150);
context.rotate(sec * 6 * Math.PI / 180);
context.beginPath();
context.moveTo(0, -90);
context.lineTo(0, 10);
context.closePath();
context.stroke();
context.restore();
};
setInterval(function () {
canvasClock("clock");
}, 1000);
</script>
</body>
</html>
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原文地址：http://www.cnblogs.com/LLJ748211490/p/4664815.html
