今天小编跟大家讲解下有关HTML5实现可缩放时钟代码 ，相信小伙伴们对这个话题应该有所关注吧，小编也收集到了有关HTML5实现可缩放时钟代码 的相关资料，希望小伙伴们看了有所帮助。
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，如果大家有任何疑问请给我留言，小编会及时回复大家的。在此也非常感谢大家对爱蒂网站的支持！
来源：爱蒂网
