我要评论废话不多说了，直接给大家贴代码了，具体代码如下所示：
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>canvas_time</title>
<style type="text/css">
div {
text-align: center;
margin-top: 250px;
}
#clock {
border: 1px solid #cccccc;
}
</style>
</head>
<body>
<div>
<canvas id="clock" height="600px" width="600px"></canvas>
</div>
<script type="text/javascript" >
var dom = document.getelementbyid('clock');
var ctx = dom.getcontext('2d');
var width = ctx.canvas.width;
var height = ctx.canvas.height;
var r = width / 2;
var rem = width/200;
function drawbackground() {
ctx.save(); //存储当前环境变量；
ctx.translate(r, r); //重置坐标到r，r
ctx.beginpath(); // 起始一条路径
ctx.linewidth = 10*rem; //设置线宽10；
ctx.arc(0, 0, r - ctx.linewidth /2, 0, 2 * math.pi, false);
ctx.stroke();
var hournumbers = [3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 1, 2]; //定义数组
ctx.font = 18*rem+"px arial";
ctx.textalign = "center";
ctx.textbaseline = "middle";
hournumbers.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);
});
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.arc(x, y, 2*rem, 0, 2 * math.pi, false);
ctx.fillstyle = "#000";
} else {
ctx.arc(x, y, 2*rem, 0, 2 * math.pi, false);
ctx.fillstyle = "#ccc";
}
ctx.fill();
}
}
function drawhour(hour, minute) {
ctx.save();
ctx.beginpath();
var rad = 2 * math.pi / 12 * hour;
var mrad = 2 * math.pi / 12 / 60 * minute;
ctx.rotate(rad + mrad);
ctx.linewidth = 6*rem;
ctx.linecap = "round";
ctx.moveto(0, 10*rem);
ctx.lineto(0, -r / 2);
ctx.stroke();
ctx.restore();
}
function drawminute(minute) {
ctx.save();
ctx.beginpath();
var rad = 2 * math.pi / 60 * minute;
ctx.rotate(rad);
ctx.linewidth = 3*rem;
ctx.linecap = "round";
ctx.moveto(0, 10*rem);
ctx.lineto(0, -r + 30*rem);
ctx.stroke();
ctx.restore();
}
function drawsecond(second) {
ctx.save();
ctx.beginpath();
ctx.fillstyle = 'red';
var rad = 2 * math.pi / 60 * second;
ctx.rotate(rad);
ctx.moveto(-2*rem, 20*rem);
ctx.lineto(2*rem, 20*rem);
ctx.lineto(1, -r + 16*rem);
ctx.lineto(-1, -r + 16*rem);
ctx.fill();
ctx.restore();
}
function drawdot() {
ctx.beginpath();
ctx.fillstyle = '#fff';
ctx.arc(0, 0, 3*rem, 0, 2 * math.pi, false);
ctx.fill();
}
function draw01() {
ctx.clearrect(0, 0, width, height);
var now = new date();
var hour = now.gethours();
var minute = now.getminutes();
var second = now.getseconds();
drawbackground();
drawhour(hour, minute);
drawminute(minute);
drawsecond(second);
drawdot();
ctx.restore();
}
draw01();
setinterval(draw01, 1000);
</script>
</body>
</html>
总结
以上所述是小编给大家介绍的html5实现可缩放时钟代码，希望对大家有所帮助
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