效果图：
代码如下：
<!DOCTYPE html>
<html>
<head>
<title>http://www.baiduyo.com</title>
<meta charset="">
<link rel="stylesheet" href="">
<style>
canvas{
background:#ccc;
}
</style>
<script>
window.onload=function () {
var canvas=document.getElementById("canvas");
var cobj=canvas.getContext("2d");
var arr=[];
var t=setInterval(function () {
cobj.clearRect(0,0,600,600);
for (var i=0; i<arr.length; i++) {
cobj.save();
cobj.translate(300,300);
cobj.scale(arr[i].scales,arr[i].scales);
cobj.rotate(arr[i].angle*Math.PI/180);
cobj.fillStyle=arr[i].color;
cobj.fillRect(arr[i].num,arr[i].num,30,30);
cobj.restore();
}
},60)
setInterval(function () {
for (var i=0; i<arr.length; i++) {
if(arr[i].num<=0){
arr.splice(i,1);
continue;
}
arr[i].angle+=2;
arr[i].num-=0.2;
arr[i].scales-=0.002;
if(arr[i].scales<=0.2){
arr[i].scales=0.2;
}
}
},60)
setInterval(function () {
var rect={angle:0,num:150,scales:1,color:"rgb("+parseInt(Math.random()*255)+","+parseInt(Math.random()*255)+","+parseInt(Math.random()*255)+")"}
arr.push(rect);
},1000)
}
</script>
</head>
<body>
<canvas id="canvas" width=600 height=600>
</canvas>
</body>
</html>
