<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>时钟</title>
</head>
<body>
<canvas id="clock" width="500" height="500" style="background-color:white;">你的浏览器不支持canvas</canvas>
<script type="text/javascript">
var canvas = document.getElementById("clock");
var cxt = canvas.getContext("2d");
function drawClock() {
var now = new Date();
var sec = now.getSeconds();
var min = now.getMinutes();
var hour = now.getHours();
hour > 12 ? hour - 12 : hour;
hour += (min / 60);
//先清空画布
cxt.clearRect(0, 0, canvas.width, canvas.height);
// var img = new Image();
// img.src = "tw.png";
// cxt.drawImage(img, 46, 46);
//img.onload = function () {
// cxt.drawImage(img, 0, 0);
//}
//画表盘大圆 圆心：x=250 y=250
// cxt.strokeStyle = "#1C86EE";
// cxt.lineWidth = 3;
// cxt.beginPath();
// cxt.arc(500, 500, 200, 0, 360);
// cxt.stroke();
// cxt.closePath();
//时刻度
for (var i = 0; i < 12; i++) {
cxt.save();//保存当前状态
cxt.lineWidth = 2;
cxt.strokeStyle = "#1C86EE"; //strokeStyle=color|gradient|pattern 返回用于笔触的颜色、渐变或模式
//设置原点
cxt.translate(250, 250); //重新映射画布上的 (x,y) 位置
//设置旋转角度
cxt.rotate(30 * i * Math.PI / 180);//弧度 角度*Math.PI/180
cxt.beginPath(); //beginPath() 方法开始一条路径，或重置当前的路径。
cxt.moveTo(0, -175); //把路径移动到画布中的指定点，不创建线条
cxt.lineTo(0, -195); //添加一个新点，然后在画布中创建从该点到最后指定点的线条
cxt.stroke(); //绘制已定义的路径
cxt.closePath();//创建从当前点回到起始点的路径
cxt.restore();//返回之前保存过的路径状态和属性s
}
//分刻度
for (var i = 0; i < 60; i++) {
cxt.save();
cxt.lineWidth = 2;
cxt.strokeStyle = "#1C86EE";
cxt.translate(250, 250);
cxt.rotate(i * 6 * Math.PI / 180);
cxt.beginPath();
cxt.moveTo(0, -185);
cxt.lineTo(0, -195);
cxt.stroke();
cxt.closePath();
cxt.restore();
}
//以下的时针、分针、秒针均要转动，所以在这里要设置其异次元空间的位置
//根据当前的小时数、分钟数、秒数分别设置各个针的角度即可
//-----------------------------时针-----------------------------
cxt.save();
cxt.lineWidth = 5;
cxt.strokeStyle = "#1C86EE";
cxt.translate(250, 250);
cxt.rotate(hour * 30 * Math.PI / 180);//每小时旋转30度
cxt.beginPath();
cxt.moveTo(0, -130);
cxt.lineTo(0, 10);
cxt.stroke();
cxt.closePath();
cxt.restore();
//-----------------------------分针-----------------------------
cxt.save();
cxt.lineWidth = 5;
cxt.strokeStyle = "#1C86EE";
cxt.translate(250, 250);
cxt.rotate(min * 6 * Math.PI / 180);//每分钟旋转6度
cxt.beginPath();
cxt.moveTo(0, -150);
cxt.lineTo(0, 10);
cxt.stroke();
cxt.closePath();
cxt.restore();
//-----------------------------秒针-----------------------------
cxt.save();
cxt.lineWidth = 3;
cxt.strokeStyle = "#1C86EE";
cxt.translate(250, 250);
cxt.rotate(sec * 6 * Math.PI / 180);//每秒旋转6度
cxt.beginPath();
cxt.moveTo(0, -170);
cxt.lineTo(0, 10);
cxt.stroke();
cxt.closePath();
//美化表盘，画中间的小圆
cxt.beginPath();
cxt.arc(0, 0, 5, 0, 360);
cxt.fillStyle = "#1C86EE";
cxt.fill();
cxt.strokeStyle = "#1C86EE";
cxt.stroke();
cxt.closePath();
//秒针上的小圆
cxt.beginPath();
cxt.arc(0, -140, 2, 0, 360);
cxt.fillStyle = "#1C86EE";
cxt.fill();
cxt.stroke();
cxt.closePath();
cxt.restore();
//显示时间
// cxt.font = "18px 微软雅黑";
// cxt.lineWidth = 2;
// cxt.fillStyle = "#1C86EE";
// hour=now.getHours();
// var str = hour > 10 ? hour : ("0" + hour) + ":" + (min > 10 ? min : ("0" + min))
// cxt.fillText(str, 225, 380);
//中国制造
// cxt.font = "12px 宋体";
// cxt.lineWidth = 1;
// cxt.fillText("Made In China", 210, 400);
// cxt.font= "16px 微软雅黑";
// cxt.lineWidth= "6";
// cxt.fillStyle ="#171717"
// ctx.font="30px Verdana";
// var str = (hour > 10 ? hour : ("0" + hour)) + ":" + (min > 10 ? min : ("0" + min))+(sec > 10 ? sec: ("0"+sec) );
// cxt.fillText(str,220,380);
}
drawClock();
setInterval(drawClock, 1000);
</script>
</body>
</html>