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| html页面代码
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" >
<meta name="viewport" content="width=device-width,initial-scale=1">
<title>canvas</title>
<style type="text/css">
div {
text-align: center;
margin-top: 250px;
}
#appStudy{
border:1px solid #cccccc;
}
</style>
</head>
<body>
<div >
<canvas id="app_study" ></canvas>
</div>
<script type="text/javascript" src="appStudy.js"></script>
</body>
</html>
脚本代码
var dom = document.getElementById("clock");
var ctx = dom.getContext("2d");
var height = ctx.canvas.height;
var width = ctx.canvas.width;
var r = height / 2;
var rem = width / 200;
var ss = 0;
//表盘
function drawBackgroup() {
ctx.save();
ctx.translate(r, r);
ctx.beginPath();
ctx.lineWidth = 8 * rem;
ctx.arc(0, 0, r - ctx.lineWidth, 2 * Math.PI, false);
ctx.stroke();
//画表盘数字
var hourNumber = [3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 2];
ctx.font = 18 * rem + "px Arial";
ctx.textAlign = "center";
ctx.textBaseline = "middle"
hourNumber.forEach(function (number, i) {
var rad = 2 * Math.PI / 12 * i;
var x = Math.cos(rad) * (r - 30 * rem);
var y = Math.sin(rad) * (r - 30 * rem);
ctx.fillText(number, x, y);
});
//刻度点
for (var i = 0; i < 60; i++) {
var rad = 2 * Math.PI / 60 * i;
var x = Math.cos(rad) * (r - 18 * rem);
var y = Math.sin(rad) * (r - 18 * rem);
ctx.beginPath();
if (i % 5 == 0) {
ctx.fillStyle = "#000000";
ctx.arc(x, y, 2 * rem, 0, 2 * Math.PI, false);
} else {
ctx.fillStyle = "#cccccc";
ctx.arc(x, y, 2 * rem, 0, 2 * Math.PI, false);
}
ctx.fill();
};
}
//时针
function drawHour(huor, min) {
ctx.save();
ctx.beginPath();
ctx.fillStyle = "#000000";
var sss = Math.PI / 360 * min;
var hoss = 2 * Math.PI * huor / 12;
ss = hoss + sss;
ctx.rotate(ss);
ctx.lineWidth = 3 * rem;
ctx.lineCap = "round";
ctx.moveTo(-6 * rem, 15 * rem)
ctx.lineTo(6 * rem, 15 * rem);
ctx.lineTo(2, -r / 2);
ctx.lineTo(-2, -r / 2);
ctx.fill();
ctx.restore();
}
//分针
function drawMinute(min) {
ctx.save();
ctx.beginPath();
ctx.fillStyle = "#000";
ctx.rotate(2 * Math.PI * min / 60);
ctx.lineWidth = 6 * rem;
ctx.lineCap = "round";
ctx.moveTo(-2 * rem, 40 * rem);
ctx.lineTo(0, -r / 12 * 7);
ctx.stroke();
ctx.restore();
}
//秒针
function drawMiao(miao) {
ctx.save();
ctx.beginPath();
ctx.fillStyle = "#ff0000";
ctx.rotate(2 * Math.PI * miao / 60);
ctx.lineWidth = 3 * rem;
ctx.lineCap = "round";
ctx.moveTo(-3 * rem, 45 * rem)
ctx.lineTo(3 * rem, 45 * rem);
ctx.lineTo(1, -r / 3 * 2);
ctx.lineTo(-1, -r / 3 * 2);
ctx.fill();
ctx.restore();
}
//表中心点
function drawDot() {
ctx.beginPath();
ctx.fillStyle = "#fff";
ctx.arc(0, 0, 2 * rem, 0, 2 * rem * Math.PI, false);
ctx.fill();
ctx.stroke();
}
function draw() {
ctx.clearRect(0, 0, width, height);
var nowTime = new Date();
var hour = nowTime.getHours();
var min = nowTime.getMinutes();
var miao = nowTime.getSeconds();
drawBackgroup();
drawHour(hour, min);
drawMinute(min);
drawMiao(miao);
drawDot();
ctx.restore();
}
draw();
//定时器
setInterval(draw, 1000);
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