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(function() {
    document.body.innerHTML='<canvas id="canvas" width="1000" height="1000">浏览器不支持</canvas>'
    const canvas = document.querySelector('#canvas');
    if (!canvas.getContext) return;
    let context = canvas.getContext('2d');
    function time() {
        context.clearRect(0, 0, canvas.width, canvas.height);
        let x = 200;
        let y = 200;
        let r = 150;
        
        context.lineWidth = 1;
        context.beginPath();
        Array(60).fill(0).forEach((item, index) => {
            context.moveTo(x, y);
            context.arc(x,y,r,6 * index * Math.PI / 180,6 * (index + 1) * Math.PI / 180,false);
        });
        context.closePath();
        context.stroke();
        
        context.fillStyle = '#fff';
        context.beginPath();
        context.moveTo(x, y);
        context.arc(x, y, r * 20 / 21, 0, 360 * Math.PI / 180, false);
        context.closePath();
        context.fill();

        
        context.lineWidth = 2;
        context.beginPath();
        Array(12).fill(0).forEach((item, index) => {
            context.moveTo(x, y);
            context.arc(x,y,r,30 * index * Math.PI / 180,30 * (index + 1) * Math.PI / 180,false);
        });
        context.closePath();
        context.stroke();

        context.fillStyle = '#fff';
        context.beginPath();
        context.moveTo(x, y);
        context.arc(x, y, r * 19 / 21, 0, 360 * Math.PI / 180, false);
        context.closePath();
        context.fill();

        
        var date = new Date();
        var hour = date.getHours();
        var minute = date.getMinutes();
        var second = date.getSeconds();
        var hourValue = (-90 + hour * 30 + minute / 2 + second / 60) * Math.PI / 180;
        var minuteValue = (-90 + minute * 6 + second / 12) * Math.PI / 180;
        var secondValue = (-90 + second * 6) * Math.PI / 180;

        
        context.lineWidth = 4;
        context.beginPath();
        context.moveTo(x, y);
        context.arc(x, y, r * 8 / 21, hourValue, hourValue, false);
        context.closePath();
        context.stroke();
        
        context.lineWidth = 2;
        context.beginPath();
        context.moveTo(x, y);
        context.arc(x, y, r * 15 / 21, minuteValue, minuteValue, false);
        context.closePath();
        context.stroke();
        
        context.beginPath();
        context.moveTo(x, y);
        context.arc(x, y, r * 18 / 21, secondValue, secondValue, false);
        context.closePath();
        context.stroke();
        
        setTimeout(time, 1000);
    }
    time();
})();