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JS achieves the effect of simulating wind snow falling

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Author: User
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JS achieves the effect of simulating wind snow falling

This article describes how JS achieves the effect of simulating wind snow falling. Share it with you for your reference. The specific implementation method is as follows:

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<! DOCTYPE html PUBLIC "-// W3C // dtd xhtml 1.0 Transitional // EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<Html xmlns = "http://www.w3.org/1999/xhtml">

<Head>

<Meta http-equiv = "Content-Type" content = "text/html; charset = UTF-8"/>

<Title> snow float and float </title>

</Head>

<Style>

* {Margin: 0; padding: 0; vertical-align: top ;}

. Xue {position: absolute; color: # fff ;}

</Style>

<Body>

<Div id = "bbb"

Style = "position: absolute; top: 0px; right: 0px; width: 400px; border: 1px #000 solid; background: # fff; z-index: 9; height: 30px; ">

</Div>

<Div id = "box"

Style = "height: 600px; position: relative; border: 1px red solid; background: #000; overflow: hidden;">

</Div>

<Div

Style = "position: absolute; top: 0px; right: 400px; border: 1px #000 solid; background: # fff; width: 400px; height: 30px; z-index: 5; ">

<Input id = "wind_id" value = "10"/> level

<Input id = "wind_button" type = button value = "Snowflake float and float"/>

</Div>

<Script>

Var box = document. getElementById ("box ");

Var I = 0, c, d, wind_time;

Var all = 0, other = 0, wind = 0;

Box. style. width = '1000px ';

Document. getElementById ("wind_button"). onclick = function (){

ClearTimeout (wind_time); wind = 0;

Wind = parseInt (document. getElementById ("wind_id"). value );

Wind_run (wind );

}

Function gogo (){

Var a = document. createElement ("div ");

A. innerHTML = '.';

A. id = "xue" + I;

A. className = "xue ";

A. style. top = parseInt (box. style. height) * (Math. random ()> 0.3? Math. random (): 0) + 'px ';

If (wind! = 0) {var ss = Math. random ()> Math. abs (wind * 0.025 )? Math. random (): (wind> 0? 0: 1);} else {var ss = Math. random ()}

A. style. left = parseInt (box. style. width) * ss + 'px ';

Box. appendChild ();

Godown (a. id, a. id, 8 * Math. random ());

I ++;

All ++;

Var x = 100 * Math. random () * Math. random ();

SetTimeout ('gogo () ', x );

};

Function removeElement (_ element) {// function for removing tags

Var _ parentElement = _ element. parentNode;

If (_ parentElement ){

_ ParentElement. removeChild (_ element );

};

};

Function godown (a, e, speed ){

If (speed <3) {speed = 3}

Var a1 = document. getElementById ();

A1.style. top = parseInt (a1.style. top) + speed + 'px ';

If (parseInt (a1.style. top) <parseInt (box. style. height) {e = setTimeout ("godown (\" "+ a +" \ ", \" "+ e +" \ "," + speed + ")", 20 )}

Else {

ClearTimeout (e );

RemoveElement (a1 );

Speed = null;

Other ++;

Document. getElementById ('bbb '). innerHTML = "there are" + (all-other) + "Snowflake points in the area ."

};

};

Function wind_run (wind ){

Var a = document. getElementById ("box"). getElementsByTagName ('div ');

For (var I = 0; I <a. length; I ++ ){

A [I]. style. left = parseInt (a [I]. style. left) + wind + 'px ';

};

If (Math. abs (wind)> 0.1) {wind_time = setTimeout ("wind_run (" + wind + ")", 20 )}

Else {clearTimeout (wind_time); wind = 0 ;};

};

Gogo ();

</Script>

</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:
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