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move balls in canvas

i'm trying to make my balls move in this canvas but every time i got something else i got creating a new balls like i'm refreshing the page so can any one tell me how to move this balls

var windowElenemt = document.getElementById("window");
var ctx = windowElenemt.getContext('2d');
var vx = 9;
var vy = 9;


  function draw(){
    var ballsColors = Math.floor(Math.random()*16777215).toString(16);
    var boxY = Math.floor(Math.random()*600);
    var boxX = Math.floor(Math.random()*1360);
    var ballPlace = Math.floor((Math.random()*30)+5);

    ctx.clearRect(0,0,windowElenemt.width,windowElenemt.height);

    boxX+=vx;
    boxY+=vy;
    ctx.beginPath();
    ctx.arc(boxX,boxY,ballPlace,0,2*Math.PI,false);
    ctx.fillStyle = "#" + ballsColors;
    ctx.fill();
    requestAnimationFrame(draw);
    }
    setInterval(draw(),1000);



  for(i = 0 ; i < 20 ; i++){
   draw();
 }
<body onload="draw()">
<canvas id="window" width= '1364' height='623' style="border:1px solid #d3d3d3;" display:'block;'></canvas>

    <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
    <script src="index.js" charset="utf-8"></script>
  </body>
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