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Native Js method for achieving simple fireworks explosion effect, js fireworks explosion

Source: Internet
Author: User
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Native Js method for achieving simple fireworks explosion effect, js fireworks explosion

This article describes how to implement simple fireworks explosion with native Js. Share it with you for your reference. The specific analysis is as follows:

Implementation principle: randomly generate some divs within a certain range to form the fireworks Effect
Copy codeThe Code is as follows: <! Doctype html>
<Html>
<Head>
<Meta charset = "UTF-8">
<Title> js fireworks </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.doc umentElement. 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 () * 0 xEFFFFF + 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 x 180/Math. PI) * 20 * Math. random ();
ODiv. speedY = Math. cos (a x 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.doc umentElement. clientWidth | aDiv [I]. offsetTop <0 | aDiv [I]. offsetTop> document.doc umentElement. clientHeight)
{
Document. body. removeChild (aDiv [I]);
ADiv. splice (I, 1 );
}
}
}
};
</Script>
</Head>
<Body style = "overflow: hidden; background: black;">
</Body>
</Html>

I hope this article will help you design javascript programs.

This article is an English version of an article which is originally in the Chinese language on aliyun.com and is provided for information purposes only. This website makes no representation or warranty of any kind, either expressed or implied, as to the accuracy, completeness ownership or reliability of the article or any translations thereof. If you have any concerns or complaints relating to the article, please send an email, providing a detailed description of the concern or complaint, to info-contact@alibabacloud.com. A staff member will contact you within 5 working days. Once verified, infringing content will be removed immediately.

Related Keywords:
explosion alpha hue fireworks fireworks gif fireworks cs5 macromedia fireworks fireworks cs6 fireworks wireframe

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