html圆盘钟表纯js有解释【搬代码】

结果如图所示：
使用的idear中的html编写

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>圆盘时钟</title>
</head>

<body>
<div style="display: flex; justify-content: center; align-items: center;">
<!--    此处的width、height调整圆盘在页面中的位置-->
    <canvas id="clockCanvas" width="800" height="800"></canvas>
    <p id="dl"></p>
</div>


<script>
    // 获取画布元素
    const canvas = document.getElementById('clockCanvas');
    const ctx = canvas.getContext('2d');

    // 经络运行当令时间表
    const meridianSchedule = [
        { meridian: "肺经当令", time: "3:00 - 5:00" },
        { meridian: "大肠经当令", time: "5:00 - 7:00" },
        { meridian: "胃经当令", time: "7:00 - 9:00" },
        { meridian: "脾经当令", time: "9:00 - 11:00" },
        { meridian: "心经当令", time: "11:00 - 13:00" },
        { meridian: "小肠经当令", time: "13:00 - 15:00" },
        { meridian: "膀胱经当令", time: "15:00 - 17:00" },
        { meridian: "肾经当令", time: "17:00 - 19:00" },
        { meridian: "心包经当令", time: "19:00 - 21:00" },
        { meridian: "三焦经当令", time: "21:00 - 23:00" },
        { meridian: "胆经当令", time: "23:00 - 1:00" },
        { meridian: "肝经当令", time: "1:00 - 3:00" }
    ];

    // 不断更新时钟
    setInterval(() => {
        drawClock();
    }, 1000);

    function drawClock() {
        // 清空画布
        ctx.clearRect(0, 0, canvas.width, canvas.height);

        // 绘制圆盘
        ctx.beginPath();
        ctx.arc(canvas.width / 2, canvas.height / 2, 150, 0, 2 * Math.PI);
        ctx.fillStyle = 'lightgray';
        ctx.fill();
        // 绘制数字
        ctx.font = '20px Arial';
        ctx.fillStyle = '#000';
        ctx.textAlign = 'center';
        ctx.textBaseline ='middle';
        for (var i = 1; i <= 12; i++) {
            var angle = (i - 3) * (Math.PI / 6);
            //xy中的 x = a + b * Math.cos(angle);a + 位置a调整的是数字的位置，数字越大越向右下偏移；b的位置设置数字距离中心多远
            var x = 400 + 140 * Math.cos(angle);
            var y = 400 + 140 * Math.sin(angle);
            ctx.fillText(i, x, y);
        }
        // 绘制 60 个表示分钟的刻度
        for (let j = 0; j < 60; j++) {
            let angle = j * (Math.PI / 30);
            ctx.beginPath();
            ctx.moveTo(400 + 130 * Math.cos(angle), 400 + 130 * Math.sin(angle));
            ctx.lineTo(400 + 150 * Math.cos(angle), 400 + 150 * Math.sin(angle));
            ctx.strokeStyle = '#aaa';
            ctx.stroke();
        }


        // 获取当前时间
        const now = new Date();
        const hours = now.getHours();
        const minutes = now.getMinutes();
        const seconds = now.getSeconds();

        // 绘制时针
        const hourAngle = (hours % 12 + minutes / 60) * (2 * Math.PI / 12);
        ctx.beginPath();
        ctx.moveTo(canvas.width / 2, canvas.height / 2);
        ctx.lineTo(canvas.width / 2 + 80 * Math.sin(hourAngle), canvas.height / 2 - 80 * Math.cos(hourAngle));
        ctx.strokeStyle = 'black';
        ctx.stroke();

        // 绘制分针
        const minuteAngle = (minutes + seconds / 60) * (2 * Math.PI / 60);
        ctx.beginPath();
        ctx.moveTo(canvas.width / 2, canvas.height / 2);
        ctx.lineTo(canvas.width / 2 + 120 * Math.sin(minuteAngle), canvas.height / 2 - 120 * Math.cos(minuteAngle));
        ctx.strokeStyle = 'black';
        ctx.stroke();

        // 绘制秒针
        const secondAngle = seconds * (2 * Math.PI / 60);
        ctx.beginPath();
        ctx.moveTo(canvas.width / 2, canvas.height / 2);
        ctx.lineTo(canvas.width / 2 + 140 * Math.sin(secondAngle), canvas.height / 2 - 140 * Math.cos(secondAngle));
        ctx.strokeStyle ='red';
        ctx.stroke();

        // 显示当前时间对应的经络
        const currentMeridian = meridianSchedule.find(item => {
            const [startTime, endTime] = item.time.split(' - ');
            const [startHour, startMinute] = startTime.split(':').map(Number);
            const [endHour, endMinute] = endTime.split(':').map(Number);
            return hours >= startHour && hours < endHour || (hours === startHour && minutes >= startMinute) || (hours === endHour && minutes < endMinute);
        });
        if (currentMeridian) {
            ctx.fillStyle = 'ed';
            ctx.fillText(currentMeridian.meridian, canvas.width / 2, canvas.height / 2 - 20);
        }

    }
</script>
</body>

</html>