使用js和canvas实现时钟效果

作者: 较劲_麻黄素
来源: 51数据库
2021-10-22

使用js和canvas写一个时钟，供大家参考，具体内容如下

<!doctype html>`
<html lang="en">

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>document</title>
</head>

<body>
  <canvas id='canvas' width='600' height='600' style="border: 1px solid red;"></canvas>
  <script>
    /** @type {htmlcanvaselement} */
    let canvas = document.queryselector("#canvas");
    let ctx = canvas.getcontext("2d");
    let deg = math.pi / 180;

    let hourr = 100;
    let minutesr = 135;
    let secondsr = 170;
    setinterval(function () {

      canvas.width = canvas.width;
      ctx.arc(300, 300, 200, 0, math.pi * 2)
      ctx.fillstyle = 'rgba(10,100,30,0.2)'
      ctx.strokestyle = 'red'
      //获取当前时间
      let dt = new date()
      let hour = dt.gethours()
      let minutes = dt.getminutes()
      let seconds = dt.getseconds()
      //时钟
      ctx.moveto(300, 300);
      let xx = hourr * (math.sin(hour * 30 * deg))
      let yy = hourr * (math.cos(hour * 30 * deg))
      ctx.lineto((300 + xx), (300 - yy))
      //分钟和秒钟
      function move(time, r) {
        ctx.moveto(300, 300);
        xx = r * (math.sin(time * 6 * deg))
        yy = r * (math.cos(time * 6 * deg))
        ctx.lineto((300 + xx), (300 - yy))
      }
      //小时指针
      for (let m = 0; m < 12; m++) {
        let xx = 190 * (math.sin(m * 30 * deg))
        let yy = 190 * (math.cos(m * 30 * deg))
        let xx1 = 200 * (math.sin(m * 30 * deg))
        let yy1 = 200 * (math.cos(m * 30 * deg))
        ctx.moveto((300 + xx), (300 - yy));
        ctx.lineto((300 + xx1), (300 - yy1))
      }

      move(seconds, secondsr)
      move(minutes, minutesr)
      ctx.fill()
      ctx.stroke()
    }, 1000)


  </script>
</body>

</html>

更多javascript时钟特效点击查看：javascript时钟特效专题

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。

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