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初学html5太阳系

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<!doctype html>
<html>
    <head>
    <meta charset="utf-8"></head>
    <body>
        <canvas id="canvas" width="1000" height="1000" style="background:#000"> </canvas>
        <script>
            var cxt=document.getElementById('canvas').getContext('2d')

            function draw(){
                for(var i=0;i<8;i++){
                    cxt.beginPath();
                    cxt.strokeStyle="gray";
                    cxt.closePath();
                    cxt.arc(500,500,(i+1)*50,0,360,false);
                    cxt.closePath();
                    cxt.stroke();
                }
            }
            draw();
            function Star(x,y,radius,cycle,scolor,ecolor){
                this.x=x;
                this.y=y;
                this.radius=radius;
                this.cycle=cycle;
                this.scolor=scolor;
                this.ecolor=ecolor;
                this.color=null;
                this.time=0;
                this.draw=function(){
                    cxt.save();
                    cxt.translate(500,500);
                    cxt.rotate(this.time*(360/this.cycle)*Math.PI/180);
                    cxt.beginPath();
                    cxt.arc(this.x,this.y,this.radius,0,360,false);
                    cxt.closePath();
                    this.color=cxt.createRadialGradient(this.x,this.y,0,this.x,this.y,this.radius);
                    this.color.addColorStop(0,this.scolor);
                    this.color.addColorStop(1,this.ecolor);
                    cxt.fillStyle=this.color;
                    cxt.fill();
                    cxt.restore();
                    this.time+=1;
                }
            }
                function Sun(){
                Star.call(this,0,0,20,0,"#ff0000","#ff9900");
            }
                            var sun=new Sun();

                function di(){
                    Star.call(this,0,-50,10,87,"#A69697","#5C3E40");
                }
                var di=new di();

                function water(){
                    Star.call(this,0,-100,10,224.701,"#C4BBAC","#1F1315");
                }
                var water=new water();
                function jin(){
                    Star.call(this,0,-150,10,365.2422,"#78B1E8","#050C12");
                }
                var jin=new jin();

                function huo(){
                    Star.call(this,0,-200,10,686.98,"#CEC9B6","#76422D");
                }
                var huo=new huo();
                function mu(){
                    Star.call(this,0,-250,10,4332.589,"#C0A48E","#322222");
                }
                var mu=new mu();
                function tu(){
                    Star.call(this,0,-300,10,10759.5,"#F7F9E3","#5C4533");
                }
                var tu=new tu();
                function hai(){
                    Star.call(this,0,-350,10,30799.095,"#A7E1E5","#19243A");
                }
                var hai=new hai();
                function ming(){
                    Star.call(this,0,-400,10,164.8*365,"#0661B2","#1E3B73");
                }
                var ming=new ming();
                function move(){
                cxt.clearRect(0,0,1000,1000)
                draw();
                ming.draw();
                sun.draw();
                di.draw();
                water.draw();
                jin.draw();
                huo.draw();
                mu.draw();
                tu.draw();
                hai.draw();
                }
                setInterval(move,10);
        </script>
    </body>
</html>

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