网上看到个时钟效果，感觉挺好看，转了来，具体通过html5画布技术实现的，效果图如下：
具体 html 代码：
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>html5 时钟效果</title>
</head>
<body>
<canvas id="dom" width="120" height="120"></canvas>
<script type="text/javascript">
/**
* Created by Administrator on 2017/3/28 0028.
* source from siwuxie095
*/
var canvas = document.getElementById('dom');
var context = canvas.getContext('2d');
var height = context.canvas.height;
var width = context.canvas.width;
var r = width / 2;
var rem = width/200;
//时钟背景
function drawBackground() {
context.save();
context.translate(r, r);
context.beginPath();
context.lineWidth = 8*rem;
context.strokeStyle = "#000"
context.arc(0, 0, r - 5*rem, 0, 2 * Math.PI, false);
context.stroke();
context.closePath();
//遍历小时数
var houseNumble = [3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 2];
houseNumble.forEach(function (number, i) {
context.textAlign = 'center';
context.textBaseline = 'middle'
context.font = 18*rem+'px Arial'
var rad = 2 * Math.PI / 12 * i;
var x = Math.cos(rad) * (r - 30*rem);
var y = Math.sin(rad) * (r - 30*rem);
context.fillText(number, x, y);
})
//定义刻度
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);
context.beginPath();
if (i % 5 == 0) {
context.fillStyle = "#000"
context.arc(x, y, 2*rem, 0, 2 * Math.PI);
} else {
context.fillStyle = "#ccc"
context.arc(x, y, 2*rem, 0, 2 * Math.PI);
}
context.fill();
context.closePath();
}
}
//定义时针
function drawHour(hour,minute) {
context.save();
context.beginPath();
context.lineWidth = 6*rem;
context.lineCap = 'round'
var rad = 2 * Math.PI / 12 * hour;
var mrad = 2* Math.PI/12/60 * minute;
context.rotate(rad+mrad);
context.moveTo(0, 10*rem);
context.lineTo(0, -r / 2);
context.stroke();
context.restore();
}
//定义分针
function drawMinute(minute) {
context.save();
context.beginPath();
context.lineWidth = 3*rem;
context.lineCap = 'round';
var rad = 2 * Math.PI / 60 * minute;
context.rotate(rad);
context.moveTo(0, 15*rem);
context.lineTo(0, -r + 34)
context.stroke();
context.restore();
}
//定义秒钟
function drawSecond(second) {
context.save();
context.beginPath();
context.lineWidth = 2*rem;
context.lineCap = 'round';
context.fillStyle = "red"
var rad = 2 * Math.PI / 60 * second;
context.rotate(rad);
context.moveTo(-2 ,20);
context.lineTo( 2, 20);
context.lineTo( 1, -r + 18);
context.lineTo( -1, -r + 18);
context.fill();
context.restore();
}
//画中心点
function drawDot() {
context.beginPath();
context.fillStyle = "#fff"
context.arc(0, 0, 4*rem, 0, 2 * Math.PI, false);
context.fill();
}
//时间函数，让时钟根据当前时间跳动
function Draw() {
context.clearRect(0,0,width,height);
var time= new Date();
var hour =time.getHours();
var minute = time.getMinutes();
var second = time.getSeconds();
drawBackground();
drawHour(hour,minute);
drawMinute(minute);
drawSecond(second);
drawDot();
context.restore()
}
Draw();
setInterval(Draw,1000);
</script>
</body>
</html>