Javascript kombiniert mit Canvas, um eine einfache kreisförmige Clock_Javascript-Fähigkeit zu implementieren

var Canvas = {};
Canvas.cxt = document.getElementById('canvasId').getContext('2d');
Canvas.Point = function(x, y){
This.x = x;
This.y = y;
};
/*Alle Grafiken auf Leinwand löschen*/
Canvas.clearCxt = ​​​​function(){
var me = this;
var canvas = me.cxt.canvas;
​ ​ me.cxt.clearRect(0,0, canvas.offsetWidth, canvas.offsetHeight);
};
/*Uhr*/
Canvas.Clock = function(){
var me = Leinwand,
          c = me.cxt,
​​​​Radius = 150, /*radius*/
Skala = 20, /*Skalenlänge*/
         Minangle = (1/30)*Math.PI, /*Bogenmaß in einer Minute*/
Stundenwinkel = (1/6)*Math.PI, /*Der Bogen einer Stunde*/
HourHandLength = Radius/2, /*Stundenzeigerlänge*/
        minHandLength = radius/3*2, /*Minutenzeigerlänge*/
        secHandLength = radius/10*9, /*Sekundenzeigerlänge*/
center = new me.Point(c.canvas.width/2, c.canvas.height/2); /*center of Circle*/
/*Zeichne den Mittelpunkt des Kreises (Mitte des Zifferblatts)*/
Funktion drawCenter(){
          c.save();
           c.translate(center.x, center.y);            c.fillStyle = 'black';
           c.beginPath();
          c.arc(0, 0, radius/20, 0, 2*Math.PI);
           c.closePath();
          c.fill();
          c.stroke();
           c.restore();
};
/*Zeichne das Zifferblatt durch Koordinatentransformation*/
Funktion drawBackGround(){
          c.save();
           c.translate(center.x, center.y); /*Translation transformation*/
          /*Maßstab zeichnen*/
         Funktion drawScale(){
                c.moveTo(radius - scale, 0);
                 c.lineTo(radius, 0);         };
           c.beginPath();
          c.arc(0, 0, radius, 0, 2*Math.PI, true);
           c.closePath();
für (var i = 1; i <= 12; i ) {
            drawScale();
              c.rotate(hourangle); /*Rotationstransformation*/
        };
/*Zeichnungszeit (3,6,9,12)*/
c.font = "bold 30px impack"
c.fillText("3", 110, 10);
          c.fillText("6", -7, 120);
          c.fillText("9", -120, 10);
          c.fillText("12", -16, -100);
          c.stroke();
           c.restore();
};
/*Stundenzeiger zeichnen (h: aktuelle Zeit (24-Stunden-Uhr))*/
This.drawHourHand = function(h){
h = h === 0? 24: h;
          c.save();
           c.translate(center.x, center.y);           c.rotate(3/2*Math.PI);
          c.rotate(h*hourangle);
           c.beginPath();
           c.moveTo(0, 0);
           c.lineTo(hourHandLength, 0);
          c.stroke();
           c.restore();
};
/*Minutenzeiger zeichnen (m: aktuelle Minute)*/
This.drawMinHand = function(m){
           m = m === 0? 60: m;
          c.save();
           c.translate(center.x, center.y);           c.rotate(3/2*Math.PI);
          c.rotate(m*minangle);
           c.beginPath();
           c.moveTo(0, 0);
           c.lineTo(minHandLength, 0);
          c.stroke();
           c.restore();
};
/*Sekundenzeiger zeichnen (s: aktuelle Sekunde)*/
This.drawSecHand = Funktion(en){
s = s === 0? 60: s;
          c.save();
           c.translate(center.x, center.y);           c.rotate(3/2*Math.PI);
          c.rotate(s*minangle);
           c.beginPath();
           c.moveTo(0, 0);
           c.lineTo(secHandLength, 0);
          c.stroke();
           c.restore();
};
/*Zeichne eine Uhr basierend auf der Ortszeit*/
This.drawClock = function(){
        var me = this;
         Funktion draw(){
          var date = new Date();
​​​​​ Canvas.clearCxt();
             drawBackGround();
           drawCenter();
              me.drawHourHand(date.getHours() date.getMinutes()/60);
               me.drawMinHand(date.getMinutes() date.getSeconds()/60);
              me.drawSecHand(date.getSeconds());
}
       draw();
setInterval(draw, 1000);
};
};
var main = function(){
var clock = new Canvas.Clock();
clock.drawClock();
};