js计时事件实现圆形时钟

本文实例为大家分享了js圆形时钟效果的具体代码,供大家参考,具体内容如下

代码:

<!DOCTYPE html>

<html>

<head>

<meta charset="utf-8"/>

<title>时钟</title>

<style>

*{margin: 0; padding: 0;}

div.dd{

margin: 0 auto;

width: 400px;

padding-top: 100px;

}

</style>

</head>

<body>

<div class="dd">

<canvas id="clock" height="400px" width="400px">你的浏览器不支持canvas</canvas>

</div>

<script type="text/javascript">

(function(doc){

var can = doc.getElementById("clock");

var con = can.getContext("2d");//创建一个2d上下文

con.translate(200, 200);//重新确定坐标原点(确定圆心位置)

//外圆

con.beginPath();

con.fillStyle = '#fff';

con.arc(0, 0, 200, 0, Math.PI*2, false);

con.fill();

//内圆

con.beginPath();

con.fillStyle = '#aaa';

con.arc(0, 0, 195, 0, Math.PI*2, false);

con.fill();

//绘制刻度

con.beginPath();

con.font = "bold 20px sans-serif";

con.textAlign = "center";

con.textBaseline = "middle"

con.fillStyle = '#000000';

con.fillText("12", 0, -170);

con.fillText("3",170,0);

con.fillText("6",0,170);

con.fillText("9",-170,0);

con.fillText("1",84,-147.224);

con.fillText("2",147.224,-84);

con.fillText("4",147.224,84);

con.fillText("5",84,147.224);

con.fillText("7",-84,147.224);

con.fillText("8",-147.224,84);

con.fillText("10",-147.224,-84);

con.fillText("11",-84,-147.224);

//获取当前时间

var d = new Date(), time ={};

time.H = d.getHours()%12;

time.M = d.getMinutes();

time.S = d.getSeconds();

function getTime(){

time.S++;

if(time.S > 59){

time.S = 0;

time.M++;

if(time.M > 60){

time.M = 0;

time.H++;

if(time.H > 11){

time.H = 0;

}

}

}

canvasTimeLine();

}

//将角度转为弧度

function numToDeg(num){

return ((num*6 - 90)*0.0174444444444444);

}

//确定刻度位置

function computePositionByLenDeg(len, deg){

return {

x: len*Math.cos(deg),

y: len*Math.sin(deg)

}

}

//绘制刻度

function canvasLineMintus(){

for(var i = 0;i<60; i++){

var rec = 180;

con.beginPath();

con.lineWidth = 4;

if(i%5 != 0){

con.lineWidth = 1;

rec = 184

}

var beinDeg = numToDeg(i),

beginPot = computePositionByLenDeg(rec, beinDeg),

endPot = computePositionByLenDeg(190, beinDeg);

con.moveTo(beginPot.x, beginPot.y);

con.lineTo(endPot.x, endPot.y);

con.stroke();

}

}

function canvasTimeLine(){

var sDeg = numToDeg(time.S),

mDeg = numToDeg(time.M),

hDeg = numToDeg(time.H*5 + Math.floor(time.M/12)),

sPot = computePositionByLenDeg(150, sDeg),

mPot = computePositionByLenDeg(135, mDeg),

hPot = computePositionByLenDeg(110, hDeg);

//时钟表面

con.beginPath();

con.fillStyle = '#ddd';

con.arc(0, 0, 156, 0, Math.PI*2, false);

con.fill();

//时针

con.beginPath();

con.moveTo(0, 0);

con.lineTo(hPot.x, hPot.y);

con.lineWidth = 6;

con.strokeStyle = "#333";

con.stroke();

//分针

con.beginPath();

con.moveTo(0, 0);

con.lineTo(mPot.x, mPot.y);

con.lineWidth = 4;

con.strokeStyle = "#333";

con.stroke();

//秒针

con.beginPath();

con.moveTo(0, 0);

con.lineTo(sPot.x, sPot.y);

con.lineWidth = 2;

con.strokeStyle = "#ff0000";

con.stroke();

//针心

con.beginPath();

con.fillStyle = '#aaaaaa';

con.arc(0, 0, 8, 0, Math.PI*2, false);

con.fill();

con.beginPath();

con.fillStyle = '#f00';

con.arc(0, 0, 4, 0, Math.PI*2, false);

con.fill();

}

canvasLineMintus();

getTime();

setInterval(getTime, 1000);

})(document);

</script>

</body>

</html>

更多JavaScript时钟特效点击查看:JavaScript时钟特效专题

以上是 js计时事件实现圆形时钟 的全部内容, 来源链接: utcz.com/z/357369.html

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