非常漂亮的js烟花效果

  • Z时代
  • 2024-01-10
  • 分类：综合

本文实例为大家分享了js实现漂亮烟花效果的具体代码，供大家参考，具体内容如下

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>烟花</title>
<style type="text/css">
 div>div{
 width:10px;
 height:10px;
 border-radius: 50%;
 position: absolute;
 top:900px; 
 left:600px;
 background-color: red;
 } 
</style>
</head>
<body>
 <div id="box"><div id="start"></div></div>
</body>
<script type="text/javascript">
 var sta = 800;
 var staa = 8; 
 var startid = setInterval(function (){
 start.style.top = (sta-=staa)+"px";
 staa -=0.06;
 if(staa<=0.5){
  clearInterval(startid);
  start.style.display="none";
  za();
 }
 },10);
 var g = 0.01;
 var lv = 0;
 var times = 0;
 var opa =1;
 function za(){
 addiv();
 var s2 = setInterval(function(){
  lv+=g;
  for(var i=0;i<200;i++){
  var elem = document.getElementById("d"+i);
  elem.style.left = (arrl[i]+=(arrv[i]*Math.cos(arrr[i])))+"px";
  elem.style.top = (arrt[i]+=(arrv[i]*Math.sin(arrr[i])+lv))+"px";
  elem.style.opacity= (opa-=0.00001);
  if(arrv[i]>0)
   arrv[i]-=0.001;
  else arrv[i]=0;
  }
  if(times++>=1000) clearInterval(s2);
 },10);
 }
 var arrr = [];
 var arrl = [];
 var arrt = [];
 var arrv = [];
 var arro = []
 function addiv(){
 for(var i=0;i<200;i++){
  box.innerHTML+="<div id='d"+i+"'></div>"
  arrl[i]=600;
  arrt[i]=sta;
  arrv[i]=Math.random()*2+0.1;
  arrr[i]=Math.random()*Math.PI*2;
 }
 }
</script>
</html>

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