js计时事件实现圆形时钟

时间:2021-04-02 人气:0
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
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