<html>
<head>
<script>
function start(){
var array=new Array();
var canvas=document.getElementById("mycanvas");
var context=canvas.getContext("2d");
for(var i=0;i<50;i++){
var Showsnow=new showsnow();
array.push(Showsnow);
}
time=setInterval(function (){
context.clearRect(0,0,canvas.width,canvas.height);
for(var i=0;i<array.length;i++){
array[i].move();
array[i].draw(context);
}
},500);
}
function showsnow(){
var y=parseInt(Math.random()*50)*10;
var x=parseInt(Math.random()*80)*10;
this.draw=function(context){
context.font="50px Calibri";
context.fillText("*",x,y);
}
this.move=function(){
y+=20;
if(y>600){
y=0;
}
}
}
</script>
</head>
<body>
<input type="button" value="start" onclick="start()" />
<br/>
<canvas id="mycanvas" height="600px" width="600px" style="border: 3px solid blue"></canvas>
</body>
</html>
