这篇文章主要介绍“javascript如何实现简单钟表效果”，在日常操作中，相信很多人在javascript如何实现简单钟表效果问题上存在疑惑，小编查阅了各式资料，整理出简单好用的操作方法，希望对大家解答”javascript如何实现简单钟表效果”的疑惑有所帮助！接下来，请跟着小编一起来学习吧！
JavaScript主要用来向HTML页面添加交互行为。
2.JavaScript可以直接嵌入到HTML页面，但写成单独的js文件有利于结构和行为的分离。 3.JavaScript具有跨平台特性，在绝大多数浏览器的支持下，可以在多种平台下运行。
复制可直接使用
<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title></title> <style> h2 { text-align: center; } div { width: 400px; height: 400px; margin: 10px auto; padding: 0; } </style> </head> <body> <h2>手绘时钟</h2> <hr /> <div> <canvas id="c1" width="400px" height="400px"> </canvas> </div> <script type="text/javascript"> var clock = document.getElementById("c1").getContext("2d"); // var clock = $("#huabu").get(0).getContext("2d"); //$中使用画布 function play() { clock.clearRect(0, 0, 400, 400); clock.save(); clock.translate(200, 200); //把画布中心转移到canvas中间 biaopan(); run(); clock.restore(); } setInterval(function() { play(); }, 1000); function biaopan() { //绘制表盘 clock.strokeStyle = " #9932CC"; clock.lineWidth = 5; clock.beginPath(); clock.arc(0, 0, 195, 0, 2 * Math.PI); clock.stroke(); //刻度(小时) clock.strokeStyle = "#9932CC"; clock.lineWidth = 5; for(var i = 0; i < 12; i++) { clock.beginPath(); clock.moveTo(0, -190); clock.lineTo(0, -170); clock.stroke(); clock.rotate(2 * Math.PI / 12); } //刻度(分钟) clock.strokeStyle = "#9932CC"; clock.lineWidth = 3; for(var i = 0; i < 60; i++) { clock.beginPath(); clock.moveTo(0, -190); clock.lineTo(0, -180); clock.stroke(); clock.rotate(2 * Math.PI / 60); } //绘制文字 clock.textAlign = "center"; clock.textBaseline = "middle"; clock.fillStyle = "#6495ED"; clock.font = "20px 微软雅黑" for(var i = 1; i < 13; i++) { clock.fillText(i,Math.sin(2*Math.PI /12*i)*150,Math.cos(2*Math.PI/12*i)*-150); } } function run() { var date = new Date(); var h = date.getHours(); var m = date.getMinutes(); var s = date.getSeconds(); // if(h > 12) { // h = h - 12; // } //日期 var week = date.getDay(); var month = date.getMonth() + 1; var day = date.getDate(); switch (week){ case 1: week = "星期一"; break; case 2: week = "星期二"; break; case 3: week = "星期三"; break; case 4: week = "星期四"; break; case 5: week = "星期五"; break; case 6: week = "星期六"; break; default: week = "星期天"; break; } clock.save(); clock.textAlign = "center"; clock.textBaseline = "middle"; clock.fillStyle = "black"; clock.font = "16px" clock.fillText(week,-2,-118); clock.fillText(month+" 月",-90,2); clock.fillText(day+" 号",90,0); clock.stroke(); clock.restore(); //时针 //分针60格 分针5格 clock.save(); clock.rotate(2 * Math.PI / 12 * h + (2 * Math.PI / 60 * m + 2 * Math.PI / 60 * s / 60) / 12); clock.strokeStyle = "black"; clock.lineWidth = 7; clock.beginPath(); clock.moveTo(0, 0); clock.lineTo(0, -80); clock.lineCap = "round"; clock.stroke(); clock.restore(); //分针 //秒针60格 分针一格 clock.save(); clock.beginPath(); clock.strokeStyle = "#D2691E"; clock.lineWidth = 5; clock.rotate(2 * Math.PI / 60 * m + 2 * Math.PI / 60 * s / 60); clock.moveTo(0, 0); clock.lineTo(0, -110); clock.lineCap = "round"; clock.stroke(); clock.restore(); //秒针 clock.strokeStyle = "red"; clock.rotate(2 * Math.PI / 60 * s); clock.lineWidth = 4; clock.beginPath(); clock.moveTo(0, 0); clock.lineTo(0, -120); clock.lineCap = "round"; clock.stroke(); //中心 clock.fillStyle = " #CCFFFF"; clock.lineWidth = 5; clock.beginPath(); clock.arc(0, 0, 10, 0, 2 * Math.PI); clock.fill(); clock.strokeStyle = "cadetblue"; clock.stroke(); } </script> </body> </html>到此，关于“javascript如何实现简单钟表效果”的学习就结束了，希望能够解决大家的疑惑。理论与实践的搭配能更好的帮助大家学习，快去试试吧！若想继续学习更多相关知识，请继续关注亿速云网站，小编会继续努力为大家带来更多实用的文章！
免责声明：本站发布的内容（图片、视频和文字）以原创、转载和分享为主，文章观点不代表本网站立场，如果涉及侵权请联系站长邮箱：is@yisu.com进行举报，并提供相关证据，一经查实，将立刻删除涉嫌侵权内容。
