<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>js烟花效果</title>
<script type="text/javascript">
document.onclick=function (ev)
{
var oEvent=ev||event;
var aDiv=[];
var oDiv=null;
var _oDiv=document.createElement('div');
var i=0;
var x=oEvent.clientX;
var y=oEvent.clientY;
_oDiv.style.position='absolute';
_oDiv.style.background='red';
_oDiv.style.width='3px';
_oDiv.style.height='30px';
_oDiv.style.left=oEvent.clientX+'px';
_oDiv.style.top=document.documentElement.clientHeight+'px';
document.body.appendChild(_oDiv);
var t=setInterval(function (){
if(_oDiv.offsetTop<=y)
{
clearInterval(t);
show();
document.body.removeChild(_oDiv);
}
_oDiv.style.top=_oDiv.offsetTop-30+'px';
}, 30);
function show()
{
var oDiv=null;
for(i=0;i<100;i++)
{
oDiv=document.createElement('div');
oDiv.style.width='3px';
oDiv.style.height='3px';
oDiv.style.background='#'+Math.ceil(Math.random()*0xEFFFFF+0x0FFFFF).toString(16);
oDiv.style.position='absolute';
oDiv.style.left=x+'px';
oDiv.style.top=y+'px';
var a=Math.random()*360;
//oDiv.speedX=Math.random()*40-20;
//oDiv.speedY=Math.random()*40-20;
oDiv.speedX=Math.sin(a*180/Math.PI)*20*Math.random();
oDiv.speedY=Math.cos(a*180/Math.PI)*20*Math.random();
document.body.appendChild(oDiv);
aDiv.push(oDiv);
}
}
setInterval(doMove, 30);
function doMove()
{
for(i=0;i<aDiv.length;i++)
{
aDiv[i].style.left=aDiv[i].offsetLeft+aDiv[i].speedX+'px';
aDiv[i].style.top=aDiv[i].offsetTop+aDiv[i].speedY+'px';
aDiv[i].speedY+=1;
if(aDiv[i].offsetLeft<0 || aDiv[i].offsetLeft>document.documentElement.clientWidth || aDiv[i].offsetTop<0 || aDiv[i].offsetTop>document.documentElement.clientHeight)
{
document.body.removeChild(aDiv[i]);
aDiv.splice(i, 1);
}
}
}
};
</script>
</head>
<body style="overflow:hidden; background:black;">
</body>
</html>
