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！
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