用HTML5的canvas实现一个炫酷时钟效果

                var x=200+(this.radius-this.platelen)*Math.sin(6*i*Math.PI/180);   
                var y=200-(this.radius-this.platelen)*Math.cos(6*i*Math.PI/180);   
  
                // 获得分钟数字的坐标   
                var numx=200+(this.radius-this.platelen-this.numLen)*Math.sin(6*i*Math.PI/180);   
                var numy=200-(this.radius-this.platelen-this.numLen)*Math.cos(6*i*Math.PI/180);   
                //获得小时数字的坐标   
                var numX=200+(this.radius-this.platelen-this.NUMLEN)*Math.sin(6*i*Math.PI/180);     
                var numY=200-(this.radius-this.platelen-this.NUMLEN)*Math.cos(6*i*Math.PI/180);   
                return {X:X,Y:Y,x:x,y:y,numx:numx,numy:numy,numX:numX,numY:numY};   
            };   
            this.drawCalibration=function(){ //画刻度   
                for(var i=0,coorObj;i<60;i++){   
                    coorObj=this.getCalibCoor(i);   
                    this.cnt.beginPath();   
                    this.cnt.moveTo(coorObj.X,coorObj.Y);   
                    this.cnt.lineTo(coorObj.x,coorObj.y);   
                    this.cnt.closePath();   
  
                    this.cnt.lineWidth=this.linewidth;