js实现烟花绽放特效

2016-12-15 网页编程网 网页编程网

<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>很漂亮的页面烟花</title>
<style type="text/css">
 html,body { height:100%;}
 body { background:#000; color:#FF0000; overflow:hidden;}
 .zzjs_net { position:absolute; width:20px; height:20px;}
</style>
</head>
<body>
<script type="text/javascript">
var getRondom = function(small,big){
   return small+(big-small)*Math.random();
 }
var $ = function(id){ return document.getElementById(id);}
function circle(){
 c=document.createElement('div');
 c.innerHTML="*";
 c.style.position ='absolute';
 c.style.left = getRondom(200,window.screen.availWidth-200)+'px';
 c.style.top = window.screen.availHeight-200 +'px';
 document.body.appendChild(c);
 h1 = getRondom(20,window.screen.availHeight-200);
 h=window.screen.availHeight ;
 t1 = setInterval(function(){h=h-10;c.style.top=h+"px"; if(h<=h1) {clearInterval(t1);start(c) }},10)
 }
function show(s1,r1){
   n=20;
   zzjs_net = s1.getElementsByTagName('div');
   for(var i=0; i<zzjs_net.length;i++){
     zzjs_net[i].className='zzjs_net';
     zzjs_net[i].style.left=r1*Math.cos(360/n*i)+'px';
     zzjs_net[i].style.top=r1*Math.sin(360/n*i)+'px';
   }
}
function start(s){
  s.style.position='relative';
 for(var i=0;i<20;i++){
  s.appendChild(document.createElement('div'))['innerHTML']='*';
  }
  r=0;
  show(s,r);
  t = setInterval(function(){r=r+10;show(s,r); if(r>=150) {clearInterval(t);s.parentNode.removeChild(s); circle9 = new circle(); }},50)
}
 circle1 = new circle();
</script>
</body>
</html>

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