js实现圆形时钟案例

日期：2020-08-17 栏目：前端经验浏览：次
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>
效果图：
转载注明出处：http://www.duanlonglong.com/qdjy/1092.html
js实现圆形时钟案例

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